RHS Exam Study Guide

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RHS Exam Study Guide - Quiz

Are you preparing for the Radiation Health and Safety (RHS) exam? Want to revise your concepts with this RHS Practice Test that is given here for free? Give it a try, and we assure you that you'll find this test very useful. The RHS exam is conducted by the Dental Assisting National Board (DANB) as a way for candidates to demonstrate their expertise in the proper safety procedures for taking x-rays. If you think you know everything about this topic, then try the quiz given here.


Questions and Answers
  • 1. 

    The film emulsion is hardened during ______. 

    • A.

      Development

    • B.

      Rinsing

    • C.

      Fixation

    • D.

      Washing

    • E.

      Drying

    Correct Answer
    C. Fixation
    Explanation
    During the process of fixation in film development, the film emulsion is hardened. Fixation involves removing the unexposed silver halide crystals from the film and making the image permanent. This is done by using a fixing solution that dissolves the undeveloped silver halide crystals while leaving the developed silver image intact. The hardening of the film emulsion during fixation helps to prevent any further chemical reactions and ensures that the image remains stable and durable.

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  • 2. 

    A higher kilovoltage produces x-rays with:

    • A.

      Greater energy levels

    • B.

      Shorter wavelengths

    • C.

      More penetrating ability

    • D.

      All of the above

    Correct Answer
    D. All of the above
    Explanation
    A higher kilovoltage produces x-rays with greater energy levels, shorter wavelengths, and more penetrating ability. When the kilovoltage is increased, the electrons in the X-ray tube are accelerated with more energy, resulting in X-rays with higher energy levels. This increase in energy also leads to shorter wavelengths, as wavelength and energy are inversely proportional. Additionally, higher kilovoltage X-rays have more penetrating ability, meaning they can pass through denser materials more easily. Therefore, all of the given options are correct.

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  • 3. 

    Which of the following is not found on the label of the side of the film packet?

    • A.

      Film speed

    • B.

      Expiration date

    • C.

      The phrase "opposite side toward tube"

    • D.

      Number of films enclosed

    Correct Answer
    B. Expiration date
    Explanation
    The expiration date is not found on the label of the side of the film packet. The label typically contains information such as the film speed, the phrase "opposite side toward tube," and the number of films enclosed. However, the expiration date is usually printed on the packaging or the box in which the film packet is contained, rather than on the label of the side of the packet itself.

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  • 4. 

    Which of the following describes scatter radiation?

    • A.

      Radiation that exits the tubehead

    • B.

      Radiation that is more penetrating than primary radiation

    • C.

      Radiation that has been deflected from its path by interaction with matter

    • D.

      None of the above

    Correct Answer
    C. Radiation that has been deflected from its path by interaction with matter
    Explanation
    Scatter radiation refers to the radiation that has been deflected from its original path by interacting with matter. When X-rays pass through the patient's body, they can be scattered in different directions due to interactions with tissues and other objects. This scatter radiation can be harmful and can contribute to radiation exposure for both the patient and the healthcare provider. Therefore, it is important to take precautions to minimize scatter radiation during X-ray procedures.

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  • 5. 

    Identify the unit of measurement that is used to describe the amount of electric current flowing through the x-ray tube. 

    • A.

      Volt

    • B.

      Ampere

    • C.

      Kilovoltage peak

    • D.

      Force

    Correct Answer
    B. Ampere
    Explanation
    The unit of measurement used to describe the amount of electric current flowing through the x-ray tube is ampere. Ampere is the SI unit for electric current and is defined as the flow of one coulomb of charge per second. It is commonly used to measure the strength of electric currents in various electrical devices, including x-ray tubes.

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  • 6. 

    The total energy contained in the x-ray beam in a specific area at a given time is termed:

    • A.

      Kilovoltage peak

    • B.

      Beam quality

    • C.

      Intensity

    • D.

      Millamperage-second

    Correct Answer
    C. Intensity
    Explanation
    Intensity refers to the total energy contained in the x-ray beam in a specific area at a given time. It is a measure of the power or strength of the beam and is determined by factors such as the number of x-ray photons and their energy. Kilovoltage peak refers to the maximum voltage applied across the x-ray tube, beam quality refers to the penetrating ability of the x-ray beam, and millamperage-second refers to the product of milliamperage and exposure time.

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  • 7. 

    The thermometer for manual processing should be placed in the _______. 

    • A.

      Developer solution

    • B.

      Water bath

    • C.

      Fixer solution

    • D.

      Either a or c

    • E.

      All of the above

    Correct Answer
    E. All of the above
    Explanation
    The correct answer is "all of the above" because the thermometer for manual processing can be placed in either the developer solution, water bath, or fixer solution. This means that it can be used to measure the temperature in any of these solutions during the manual processing of whatever is being processed.

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  • 8. 

    At 68º F, what is the optimal development time for manual film processing?

    • A.

      2 minutes

    • B.

      3 minutes

    • C.

      4 minutes

    • D.

      5 minutes

    • E.

      6 minutes

    Correct Answer
    D. 5 minutes
    Explanation
    The optimal development time for manual film processing at 68°F is 5 minutes. This is because the temperature affects the chemical reactions involved in developing the film. At a higher temperature, the development time may need to be shorter to prevent overdevelopment, while at a lower temperature, the development time may need to be longer to ensure proper development. Therefore, at 68°F, 5 minutes is the recommended time for optimal results.

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  • 9. 

    If kilovoltage is decreased with no other variations in exposure factors, the resultant image will:

    • A.

      Appear lighter

    • B.

      Appear darker

    • C.

      Remain the same

    • D.

      Either a or b

    Correct Answer
    A. Appear lighter
    Explanation
    When the kilovoltage is decreased with no other changes in exposure factors, the resultant image will appear lighter. Kilovoltage (kV) is responsible for controlling the contrast and penetration of the X-ray beam. Decreasing the kV reduces the overall energy of the X-rays, resulting in less penetration through the patient's body. As a result, the X-rays are more absorbed by the patient's tissues, leading to a lighter image with less contrast.

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  • 10. 

    What is the greatest contributor to artificial radiation exposure? 

    • A.

      Radioactive materials

    • B.

      Medical radiation

    • C.

      Consumer products

    • D.

      Weapons production

    • E.

      Nuclear fuel cycle

    Correct Answer
    B. Medical radiation
    Explanation
    Medical radiation is the greatest contributor to artificial radiation exposure. This is because medical procedures such as X-rays, CT scans, and radiation therapy use ionizing radiation, which can increase a person's exposure to radiation. These procedures are commonly performed and are essential for diagnosing and treating various medical conditions. While radioactive materials, consumer products, weapons production, and the nuclear fuel cycle also contribute to artificial radiation exposure, medical radiation is the largest contributor due to its widespread use in healthcare settings.

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  • 11. 

    In manual film processing the optimal temperature for the developer solution is:

    • A.

      55º F

    • B.

      68º F

    • C.

      78º F

    • D.

      80º F

    • E.

      90º F

    Correct Answer
    B. 68º F
    Explanation
    In manual film processing, the optimal temperature for the developer solution is 68º F. This temperature is considered ideal because it allows for proper chemical reactions to occur, resulting in accurate and high-quality film development. Higher temperatures can cause the developer solution to work too quickly, leading to overdevelopment and loss of detail. On the other hand, lower temperatures can slow down the development process, resulting in underdevelopment and poor image quality. Therefore, maintaining the developer solution at 68º F ensures optimal results in manual film processing.

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  • 12. 

    Which of the following statements is incorrect?

    • A.

      Velocity is the speed of a wave

    • B.

      Wavelength is the distance between waves

    • C.

      Frequency is the number of wavelengths that pass a given point in a certain amount of time

    • D.

      Frequency and wavelength are inversely related

    Correct Answer
    B. Wavelength is the distance between waves
    Explanation
    The statement "Wavelength is the distance between waves" is incorrect. Wavelength is not the distance between individual waves but rather the distance between two consecutive points (such as crests or troughs) on a wave that are in phase with each other. In other words, it is the distance over which the wave's shape repeats itself. It is commonly measured from one crest to the next crest or from one trough to the next trough.

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  • 13. 

    Portion of a processed radiograph that appears light or white is termed as _____. 

    • A.

      Radiolucent

    • B.

      Radiopaque

    • C.

      Dense

    • D.

      High density

    Correct Answer
    B. Radiopaque
    Explanation
    A portion of a processed radiograph that appears light or white is termed as radiopaque. Radiopaque refers to an area on the radiograph that is dense and does not allow the passage of X-rays, resulting in a white appearance. This can be caused by materials such as metal or bone, which absorb X-rays and prevent them from reaching the film or detector.

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  • 14. 

    Wavelength is used to determine __________. 

    • A.

      The temperature of the cathode filament

    • B.

      Energy and penetrating power of radiation

    • C.

      The speed of a wave

    • D.

      None of the above

    Correct Answer
    B. Energy and penetrating power of radiation
    Explanation
    Wavelength is used to determine the energy and penetrating power of radiation. This is because the wavelength of a wave is inversely proportional to its energy. Shorter wavelengths have higher energy and greater penetrating power, while longer wavelengths have lower energy and less penetrating power. Therefore, by measuring the wavelength of radiation, we can determine its energy and how deeply it can penetrate different materials.

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  • 15. 

    Dental patient has thick soft tissues and dense bones. to compensate for this increase in subject thickness and  to provide an image of diagnostic density the dental radiographer may:

    • A.

      Increase the exposure time

    • B.

      Increase the milliamperage

    • C.

      Increase the operating kilovoltage peak

    • D.

      Any of the above

    Correct Answer
    D. Any of the above
    Explanation
    The correct answer is "any of the above" because all three options mentioned (increasing the exposure time, increasing the milliamperage, and increasing the operating kilovoltage peak) can help compensate for the thick soft tissues and dense bones of a dental patient. By increasing these factors, the dental radiographer can ensure that the resulting image has sufficient diagnostic density to accurately assess the patient's dental condition.

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  • 16. 

    When viewed on a light source, a dental radiograph that demonstrates very dark areas and very light areas is said to have

    • A.

      High contrast

    • B.

      Low contrast

    • C.

      High density

    • D.

      Low density

    Correct Answer
    A. High contrast
    Explanation
    A dental radiograph that demonstrates very dark areas and very light areas when viewed on a light source is said to have high contrast. This means that there is a significant difference in brightness between the dark and light areas on the radiograph. High contrast can be beneficial in dental radiography as it allows for better visualization of the different structures and details within the image.

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  • 17. 

    The device used to hold the extraoral film and intensifying screens is termed as _____. 

    • A.

      Screen holder

    • B.

      Film holder

    • C.

      Cassette

    • D.

      Any of the above

    Correct Answer
    C. Cassette
    Explanation
    A cassette is the device used to hold the extraoral film and intensifying screens. It is a light-tight container that protects the film and screens from exposure to light and allows for easy handling and positioning during dental imaging procedures. The cassette ensures that the film and screens are held securely in place and properly aligned with the X-ray beam, resulting in accurate and high-quality radiographic images.

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  • 18. 

    Which of the following film sizes is known as the standard film?

    • A.

      Size 0

    • B.

      Size 1

    • C.

      Size 2

    • D.

      Size 3

    Correct Answer
    C. Size 2
    Explanation
    Size 2 is known as the standard film size because it is the most commonly used film size in the industry. It is widely available and compatible with most cameras and projectors. Size 0 and size 1 are smaller film sizes typically used for specialized purposes, while size 3 is a larger format used for panoramic or wide-angle shots. Therefore, size 2 is considered the standard film size due to its widespread use and compatibility.

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  • 19. 

    Which beam alignment devices are recommended for use with the paralleling technique to reduce radiation exposure to to the patient?

    Correct Answer
    snap on ring collimator
    Explanation
    A snap-on ring collimator is recommended for use with the paralleling technique to reduce radiation exposure to the patient. This device helps to limit the size and shape of the x-ray beam, ensuring that only the necessary area is exposed to radiation. By reducing the scatter radiation, the patient's overall radiation exposure is minimized.

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  • 20. 

    The size of the darkroom is determined by all the following factors except:

    • A.

      Volume of radiographs processed

    • B.

      Type of processing equipment used

    • C.

      Humidity level of the room

    • D.

      Space required for duplication of films

    • E.

      Number of persons using the room

    Correct Answer
    C. Humidity level of the room
    Explanation
    The size of the darkroom is determined by factors such as the volume of radiographs processed, the type of processing equipment used, the space required for duplication of films, and the number of persons using the room. However, the humidity level of the room does not affect the size of the darkroom.

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  • 21. 

    Difference in the degrees of blackness between adjacent areas on a dental radiograph is termed :

    • A.

      Density

    • B.

      Contrast

    • C.

      Subject thickness

    • D.

      Diagnostic quality

    Correct Answer
    B. Contrast
    Explanation
    The correct answer is contrast. Contrast refers to the difference in the degrees of blackness between adjacent areas on a dental radiograph. It is an important factor in dental radiography as it helps in distinguishing between different structures and identifying any abnormalities or pathologies present. By analyzing the contrast, dental professionals can make accurate diagnoses and treatment plans.

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  • 22. 

    Identify the term that describes how dark  and light areas are differentiated on an image:

    • A.

      Contrast

    • B.

      Density

    • C.

      Intensity

    • D.

      Polychromatic

    Correct Answer
    A. Contrast
    Explanation
    Contrast refers to the difference in brightness between the light and dark areas of an image. It is the term used to describe how well the different elements in an image stand out from each other. By adjusting the contrast, the visual impact and clarity of an image can be enhanced, making it easier to distinguish between different objects and details.

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  • 23. 

    All the following factors affect the life of the processing solutions except

    • A.

      Number of film processed

    • B.

      Care in preparation of solutions

    • C.

      Type of safelight filter used

    • D.

      Age of solutions

    • E.

      Proper care and maintenance of the automatic processor

    Correct Answer
    C. Type of safelight filter used
    Explanation
    The type of safelight filter used does not affect the life of the processing solutions. The factors that can affect the life of the processing solutions include the number of films processed, care in preparation of solutions, age of solutions, and proper care and maintenance of the automatic processor.

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  • 24. 

    Any leaks of white light into the darkroom will cause:

    • A.

      Film fogging

    • B.

      Film reticulation

    • C.

      Overdeveloped films

    • D.

      Underexposed films

    • E.

      All of the above

    Correct Answer
    A. Film fogging
    Explanation
    Any leaks of white light into the darkroom will cause film fogging. Film fogging refers to the unwanted exposure of the film to light, which can result in a loss of image quality, reduced contrast, and overall degradation of the final photograph. This can occur when the film is exposed to light during the development process or when the film is improperly stored or handled.

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  • 25. 

    Which of the following appears most radiolucent on a radiograph

    • A.

      Bone

    • B.

      Enamel

    • C.

      Dentin

    • D.

      Air space

    Correct Answer
    D. Air space
    Explanation
    Air space appears most radiolucent on a radiograph because it allows the X-rays to pass through easily, resulting in a darker area on the image. In contrast, bone, enamel, and dentin are denser and absorb more X-rays, appearing more radiopaque on the radiograph.

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  • 26. 

    Increasing which of these four exposure controls will increase the intensity of the x-ray beam: (1) kilovoltage, (2) milliamperage, (3) exposure time, (4) source to source distance?

    • A.

      1 and 2

    • B.

      2 and 3

    • C.

      1, 2, and 3

    • D.

      1, 2, 3, and 4

    Correct Answer
    D. 1, 2, 3, and 4
    Explanation
    Increasing kilovoltage (1) will increase the energy of the x-ray photons, resulting in a higher intensity of the x-ray beam. Increasing milliamperage (2) will increase the number of x-ray photons emitted per unit of time, also increasing the intensity of the x-ray beam. Increasing exposure time (3) will allow more x-ray photons to be emitted, further increasing the intensity of the x-ray beam. Increasing the source to source distance (4) will decrease the intensity of the x-ray beam, as the x-ray photons will spread out over a larger area. Therefore, increasing all four exposure controls will increase the intensity of the x-ray beam.

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  • 27. 

    The speed of a film is determined by the size of the silver halide crystals in the emulsion. Identify the true statement: 

    • A.

      The larger the crystals, faster the film speed

    • B.

      The larger the crystals, slower the film speed

    • C.

      The smaller the crystals, the faster the film speed

    • D.

      None of the above is correct

    Correct Answer
    A. The larger the crystals, faster the film speed
    Explanation
    The size of the silver halide crystals in the emulsion determines the speed of a film. Larger crystals allow more light to be captured, resulting in a faster film speed. This is because larger crystals have a greater surface area, allowing them to react more quickly to light. Therefore, the statement "the larger the crystals, faster the film speed" is true.

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  • 28. 

    The safelight must be placed a minimum of what distance from the film and the work area?

    • A.

      1 foot

    • B.

      2 feet

    • C.

      3 feet

    • D.

      4 feet

    • E.

      5 feet

    Correct Answer
    D. 4 feet
    Explanation
    The safelight must be placed a minimum of 4 feet from the film and the work area to ensure that the light emitted by the safelight does not affect the film during processing. Placing the safelight at a greater distance helps to minimize the risk of fogging or unwanted exposure on the film.

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  • 29. 

    A radiograph that has many light and dark areas with few shades of gray is said to have:

    • A.

      High density

    • B.

      Low density

    • C.

      High contrast

    • D.

      Low contrast

    Correct Answer
    C. High contrast
    Explanation
    A radiograph with many light and dark areas and few shades of gray indicates a high contrast. High contrast means that there is a significant difference between the light and dark areas, resulting in a clear distinction between the different structures or tissues being imaged. This can be useful in identifying abnormalities or specific features in the radiograph.

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  • 30. 

    An example of a radiopaque structure seen on a dental x-rays is 

    • A.

      Bone

    • B.

      Enamel

    • C.

      Dentin

    • D.

      All of the above

    Correct Answer
    D. All of the above
    Explanation
    All of the options listed (bone, enamel, dentin) are examples of radiopaque structures that can be seen on dental x-rays. Radiopaque structures appear white or light gray on the x-ray image because they absorb more x-ray radiation. Bone, enamel, and dentin are all dense structures that have a high degree of radiopacity, making them easily visible on dental x-rays.

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  • 31. 

    A replenisher is added to the processing solution to

    • A.

      Compensate for the loss of volume of solutions

    • B.

      Ensure uniform results between solution changes

    • C.

      Compensate for the loss of volume of solution

    • D.

      Compensate for oxidation

    • E.

      All of the above

    Correct Answer
    E. All of the above
    Explanation
    A replenisher is added to the processing solution to compensate for the loss of volume of solutions, ensure uniform results between solution changes, and compensate for oxidation. This means that the replenisher serves multiple purposes, including replacing lost volume, maintaining consistent results, and preventing oxidation.

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  • 32. 

    Increasing milliamperage alone results in an image with:

    • A.

      High contrast

    • B.

      Low contrast

    • C.

      Increased density

    • D.

      Decreased density

    Correct Answer
    C. Increased density
    Explanation
    Milliamperage (mA) is one of the factors that affect the exposure of X-rays in radiography. When you increase the milliamperage, it means you are increasing the quantity of X-rays produced. This results in a greater exposure or density in the image, making it darker or denser. It doesn't directly affect contrast; instead, it affects the overall brightness or darkness of the image. Contrast is primarily influenced by other factors like kilovoltage (kVp) and the subject's tissue density.

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  • 33. 

    Overall blackness or darkness of a dental radiograph is termed

    • A.

      Density

    • B.

      Contrast

    • C.

      Subject thickness

    • D.

      Diagnostic quality

    Correct Answer
    A. Density
    Explanation
    Density refers to the overall blackness or darkness of a dental radiograph. It is determined by the amount of radiation that reaches the film or sensor and is influenced by factors such as exposure time and kilovoltage settings. Higher density indicates a darker image, while lower density indicates a lighter image. Density is an important factor in determining the diagnostic quality of a radiograph as it affects the visibility and clarity of anatomical structures and pathologies.

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  • 34. 

    Which of the following is the largest intraoral film size? 

    • A.

      Size 4

    • B.

      Size 3

    • C.

      Size 2

    • D.

      Size 1

    Correct Answer
    A. Size 4
    Explanation
    Size 4 is the largest intraoral film size. Intraoral films are used in dental radiography to capture images of the teeth and surrounding structures. The film size refers to the physical dimensions of the film. Size 4 is larger than size 3, size 2, and size 1, making it the largest option. A larger film size allows for a wider area to be captured in a single image, which can be useful for capturing a full mouth or a panoramic view.

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  • 35. 

    Which of the following is the location where thermionic emission occurs?

    • A.

      Positive cathode

    • B.

      Positive anode

    • C.

      Negative cathode

    • D.

      Negative anode

    Correct Answer
    C. Negative cathode
    Explanation
    Thermionic emission is the process of electrons being emitted from a heated surface. In this case, the correct answer is "negative cathode" because the cathode is the electrode from which the electrons are emitted. The negative charge on the cathode attracts the positively charged electrons, causing them to be released.

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  • 36. 

    What year was the radiation control for health & safety act established

    • A.

      1922

    • B.

      1991

    • C.

      1968

    • D.

      1942

    Correct Answer
    C. 1968
    Explanation
    The Radiation Control for Health & Safety Act was established in 1968. This act was implemented to regulate the use of radiation and protect the health and safety of individuals from the harmful effects of radiation. It aimed to establish standards for the control of radiation sources, including medical devices and nuclear materials, and to ensure proper training and certification for individuals working with radiation. By setting guidelines and regulations, this act aimed to minimize the risks associated with radiation exposure and promote the safe use of radiation in various industries.

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  • 37. 

    The latent period in radiation biology time is the time between

    • A.

      Exposure of film and development

    • B.

      Subsequent doses of radiation

    • C.

      Cell rest and cell mitosis

    • D.

      Exposure to x-radiation and clinical symptoms

    • E.

      None of the above

    Correct Answer
    D. Exposure to x-radiation and clinical symptoms
    Explanation
    The latent period in radiation biology refers to the time between exposure to x-radiation and the appearance of clinical symptoms. During this period, no immediate effects or symptoms are observed, even though radiation damage may have occurred. This delay is due to the time required for the biological effects of radiation to manifest and become clinically apparent.

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  • 38. 

    Which of the following statements is incorrect?

    • A.

      X-rays travel at the speed of sound

    • B.

      X-rays have no charge

    • C.

      X-rays cannot be focused to a point

    • D.

      X-rays cause ionization

    Correct Answer
    A. X-rays travel at the speed of sound
    Explanation
    X-rays travel at the speed of light, not at the speed of sound. Sound waves require a medium to travel through, such as air, water, or solids, while X-rays are a form of electromagnetic radiation that can travel through a vacuum. Therefore, it is incorrect to say that X-rays travel at the speed of sound.

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  • 39. 

    The traditional unit for measuring x-ray exposure in air is termed: 

    • A.

      The gray

    • B.

      Coulombs per kilogram

    • C.

      The rem

    • D.

      The rad

    • E.

      The roentgen

    Correct Answer
    E. The roentgen
    Explanation
    The traditional unit for measuring x-ray exposure in air is the roentgen. This unit is used to quantify the amount of ionizing radiation produced by x-rays. It measures the amount of ionization produced in a specific volume of air when exposed to x-rays. The roentgen is commonly used in medical and industrial settings to assess radiation levels and ensure safety standards are met.

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  • 40. 

    Unopened boxes of radiographic film should not be stored in darkroom because

    • A.

      Chemical fumes from processing solutions may fog the film

    • B.

      Continued exposure to the safelight is not recommended

    • C.

      The box may have a tear that may expose film

    • D.

      Processing solutions could splash onto the film boxes

    • E.

      All of the above

    Correct Answer
    E. All of the above
    Explanation
    Unopened boxes of radiographic film should not be stored in the darkroom because there are multiple potential risks. Chemical fumes from processing solutions may fog the film, continued exposure to the safelight is not recommended, the box may have a tear that may expose the film, and processing solutions could splash onto the film boxes. Therefore, it is best to avoid storing unopened boxes of radiographic film in the darkroom to prevent any potential damage or contamination.

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  • 41. 

    What year did the FDA standardized all manufacturing of radiographic dental equipment?

    • A.

      1968

    • B.

      1974

    • C.

      1991

    • D.

      1954

    Correct Answer
    B. 1974
    Explanation
    In 1974, the FDA standardized all manufacturing of radiographic dental equipment. This means that starting from this year, there were specific regulations and guidelines put in place by the FDA to ensure that the manufacturing processes of radiographic dental equipment met certain standards. This standardization aimed to improve the safety and quality of dental equipment used for radiographic imaging procedures.

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  • 42. 

    The quality factor (QF) is determined by what radiation unit?

    • A.

      The roentgen

    • B.

      The rad

    • C.

      The rem

    • D.

      The gray

    • E.

      Coulombs per kilogram

    Correct Answer
    C. The rem
    Explanation
    The quality factor (QF) is a measure of the biological effectiveness of different types of radiation. It takes into account the type and energy of the radiation and how it interacts with human tissues. The rem (Roentgen Equivalent Man) is a unit that incorporates the QF and is used to measure the dose equivalent of radiation. Therefore, the correct answer is "the rem" because it is the unit that determines the quality factor.

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  • 43. 

    Increasing milliamperage will cause

    • A.

      Increase in density; image appears darker

    • B.

      Increase in density; image appears lighter

    • C.

      Decrease in density; image appears darker

    • D.

      Decrease in density; image appears lighter

    Correct Answer
    A. Increase in density; image appears darker
    Explanation
    Increasing milliamperage will cause an increase in the density of the image, resulting in a darker appearance. Milliamperage refers to the amount of electrical current passing through the X-ray tube, and increasing it leads to more X-ray photons being produced. These additional photons contribute to a higher density in the image, making it appear darker.

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  • 44. 

    One exposure factor that has a direct influence on the contrast of a dental radiograph is 

    • A.

      Operating kvp

    • B.

      MA

    • C.

      Exposure time

    • D.

      Subject thickness

    Correct Answer
    A. Operating kvp
    Explanation
    The operating kvp (kilovoltage peak) directly influences the contrast of a dental radiograph. kvp determines the energy of the x-ray photons produced, which affects the ability of the x-rays to penetrate the tissues. Higher kvp values result in more penetration and lower contrast, while lower kvp values result in less penetration and higher contrast. Therefore, the operating kvp setting plays a crucial role in determining the contrast of the dental radiograph.

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  • 45. 

    Which of the following statements is correct? 

    • A.

      X-rays are a form of electromagnetic radiation; visible light is not

    • B.

      X-rays have more energy than does visible light

    • C.

      X-rays have a longer wavelength than does visible light

    • D.

      X-rays travel more slowly than does visible light

    Correct Answer
    B. X-rays have more energy than does visible light
    Explanation
    X-rays have more energy than visible light because they have a shorter wavelength. The energy of electromagnetic radiation is inversely proportional to its wavelength, meaning that shorter wavelengths have higher energy. X-rays have wavelengths in the range of 0.01 to 10 nanometers, while visible light has wavelengths in the range of 400 to 700 nanometers. Therefore, X-rays have higher energy than visible light.

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  • 46. 

    Increasing operating kilovoltage peak will cause

    • A.

      Increase in density; image appears darker

    • B.

      Increase in density: image appears lighter

    • C.

      Decrease in density; image appears darker

    • D.

      Decrease in density; image appears lighter

    Correct Answer
    A. Increase in density; image appears darker
    Explanation
    Increasing the operating kilovoltage peak in radiography causes an increase in density, resulting in a darker image. This is because higher kilovoltage peak allows more X-rays to penetrate the object being imaged, resulting in increased exposure and darker areas on the image.

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  • 47. 

    4 basic components of film composition

    Correct Answer
    film base, adhesive layer, film emulsion, protective layer
    Explanation
    The correct answer for the question is "film base, adhesive layer, film emulsion, protective layer." These four components are essential in film composition. The film base provides a stable support for the emulsion and protects it from damage. The adhesive layer helps to bond the emulsion to the film base. The film emulsion contains light-sensitive chemicals that capture the image. Lastly, the protective layer safeguards the emulsion from scratches and other external factors.

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  • 48. 

    Which act requires education and certification of persons using radiographic equipment

    • A.

      Radiation control for health and safety act

    • B.

      Consumer patient radiation health and safety act

    • C.

      None of the above

    Correct Answer
    B. Consumer patient radiation health and safety act
    Explanation
    The correct answer is the Consumer Patient Radiation Health and Safety Act. This act requires education and certification of persons using radiographic equipment. It is specifically designed to ensure the safety and health of consumers and patients when it comes to radiation exposure. This act aims to regulate the use of radiographic equipment and ensure that only trained and certified individuals handle such equipment, reducing the risk of radiation-related accidents and ensuring proper safety measures are followed.

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  • 49. 

    Increasing exposure time will cause

    • A.

      Increase in density; image appears darker

    • B.

      Increase in density; image appears lighter

    • C.

      Decrease in density; image appears darker

    • D.

      Decrease in density; image appears lighter

    Correct Answer
    A. Increase in density; image appears darker
    Explanation
    Increasing exposure time refers to the amount of time the camera's sensor is exposed to light when taking a photograph. When the exposure time is increased, more light is allowed to enter the sensor, resulting in a higher density of the image. This increased density causes the image to appear darker because there is more overall darkness in the image due to the longer exposure time.

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  • 50. 

    The length of the position-indicated device is changed from 16 inches to 8 inches. The resultant intensity of the beam will be:

    • A.

      Four times as intense

    • B.

      Twice as intense

    • C.

      Half as intense

    • D.

      One fourth as intense

    Correct Answer
    A. Four times as intense
    Explanation
    The intensity of a beam of light is inversely proportional to the square of the distance from the source. This relationship is described by the inverse square law.
    So, if the length of the position-indicated device is changed from 16 inches to 8 inches, the resultant intensity of the beam will increase.
    The inverse square law can be expressed as:
    I1 / I2 = (D2 / D1)^2
    Where:
    I1 is the initial intensity (at 16 inches).
    I2 is the final intensity (at 8 inches).
    D1 is the initial distance (16 inches).
    D2 is the final distance (8 inches).
    In this case, if we plug in the values:
    I1 / I2 = (16 / 8)^2 = 2^2 = 4
    So, the resultant intensity of the beam will be 4 times greater when the distance is reduced from 16 inches to 8 inches.

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