Take The Ultimate Practice Questions On Radiography! Quiz
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Have you ever had a fracture and needed to get an X-ray? You might not have known it at the time, but the process whereby an image was taken of your skeleton is called radiography – it is defined as an imaging technique used in order to view the internal form of an object, another example of which you’ll find in an airport checking bags at the security line. What do you know about the study?
- 1.An excellent radiograph is obtained under given exposure conditions with a tube current of 5 milliamperes and an exposure time of 12 minutes. If other conditions are not changed, what exposure time would be required if the X-ray tube current could be raised to 10 milliamperes?
- A.
24 minutes
- B.
12 minutes
- C.
6 minutes
- D.
3 minutes
- 2.
- A.
Between the intensifying screen and the film
- B.
On the source side of the test object
- C.
On the film side of the test object
- D.
Between the operator and the radiation source
- 3.When radiographing to the 2-2T quality level, an ASTM penetrameter for 1/2-inch thick 2024 aluminum alloy has a thickness of:
- A.
1/2 inch
- B.
2 mils
- C.
5 mils
- D.
10 mils
- 4.The penetrating ability of an X-ray beam is governed by:
- A.
Kilovoltage or wavelength
- B.
Time
- C.
Milliamperage
- D.
Source-to-film distance
- 5.Cobalt-60 used in nondestructive testing emits:
- A.
Alpha particles
- B.
Neutrons
- C.
Gamma rays
- D.
X rays
- 6.A densitometer is:
- A.
A meter used to measure X-ray intensity
- B.
An instrument for measuring film density
- C.
A meter used to measure the density of a material
- D.
A meter used to measure tube current
- 7.Three liquids which are essential to process an exposed film properly are:
- A.
Stop batch, acetic acid, and water
- B.
Developer, stop bath, and H2O2
- C.
Developer, fixer, and water
- D.
Acetic acid, fixer, and stop bath
- 8.The two most common causes for excessively high-density radiographs are:
- A.
Insufficient washing and overdevelopment
- B.
Contaminated fixer and insufficient washing
- C.
Overexposure and contaminated fixer
- D.
Overexposure and overdevelopment
- 9.The time required for one-half of the atoms in a particular sample of radioactive material to disintegrate is called:
- A.
The inverse square law
- B.
A curie
- C.
A half-life
- D.
The exposure time
- 10.
- A.
Radiation limits for humans
- B.
Roentgens per hour
- C.
X rays per hour
- D.
Radiation in hydrogen
- 11.The ability to detect a small discontinuity or flaw is called:
- A.
Radiographic contrast
- B.
Radiographic sensitivity
- C.
Radiographic density
- D.
Radiographic resolution
- 12.Movement, geometry, and screen contact are three factors that affect radiographic:
- A.
Contrast
- B.
Unsharpness
- C.
Reticulation
- D.
Density
- 13.The difference between the densities of two areas of a radiograph is called:
- A.
Radiographic contrast
- B.
Subject contrast
- C.
Film contrast
- D.
Definition Definition
- 14.Upon completing an X-ray exposure and turning the equipment off:
- A.
Personnel should wait for a few minutes before entering the exposure area
- B.
Personnel should wear a lead-lined apron before entering-the exposure area
- C.
Personnel should enter the exposure area without fear of radiation exposure
- D.
Personnel should take a reading with a survey meter before entering the exposure area.
- 15.The most widely used unit of measurement for measuring the rate at which the output of a gamma-ray source decays is the:
- A.
Curie
- B.
Roentgen
- C.
Half-life
- D.
MeV
- 16.Exposure to X rays or gamma rays:
- A.
May have a cumulative effect which must be considered when monitoring for maximum permissible dose
- B.
Will be beneficial since they build up an immunity to radiation poisoning
- C.
Will have no effect on human beings
- D.
Will have only a short-t€rm effect on human tissues
- 17.Which dose would be dangerous, if not fatal, if applied to the entire body in a short period of time:
- A.
1.5 to 15 R
- B.
25 to 70 R
- C.
200 to 800 R
- D.
All of the above doses would most likely be fatal
- 18.When doing gamma-ray radiography with high-intensity emitters, the sources are best handled:
- A.
Directly by personnel equipped with special protective clothing with speciar protective clothing.
- B.
By remote handling equipment
- C.
Directly by personnel with special protective clothing except when radiographs are being made
- D.
By the same methods used for low intensity emitters
- 19.If a film is placed in a developer solution and allowed to develop without any agitation:
- A.
The radiograph will not show proper contrast
- B.
It will be impossible to fix the radiograph permanently
- C.
There will be a general "fogging" condition over the entire radiograph
- D.
There will be a tendency for each area of the film to affect the development of the areas immediately below it
- 20.
- A.
The thickness of the part
- B.
The material of the specimen
- C.
The voltage range of the available X-ray machine
- D.
All three of the above factors
- 21.When radiographing a part which contains a large crack, the crack will appear on the radiograph as:
- A.
A dark, intermittent or continuous line
- B.
A light, irregular line
- C.
Either a dark or light line
- D.
A fogged area on the radiograph
- 22.A cobalt-60 source has a half-life of
- A.
1.2 years
- B.
6 months
- C.
5.3 years
- D.
75 days
- 23.
- A.
The current passing through the filament (cathode)
- B.
The distance from the cathode to the anode
- C.
The type of material used in the target
- D.
The voltage and waveform applied to-the X-ray tube
- 24.The voltage and waveform applied to the X-ray tube by a high-voltage transformer primarily determines the:
- A.
Quantity of radiation
- B.
Duration of exposure
- C.
Penetrating ability
- D.
X-ray beam divergence
- 25.
- A.
Intensifies the scatter radiation more than the primary radiation
- B.
Decreases the contrast of the radiographic image
- C.
Intensifies the primary radiation more than the scatter radiation
- D.
Should not be used when gamma rays are emitted by the source of radiation
- 26.Fluorescent intensifying screens are usually mounted in pairs in rigid holders called:
- A.
Film racks
- B.
Cassettes
- C.
Emulsifiers
- D.
Diaphragms
- 27.Radiographic sensitivity, in the context of the minimum detectable flaw size, depends on:
- A.
Graininess of the film
- B.
The unsharpness of the flaw image in the film
- C.
The contrast of the flaw image on the film
- D.
All three of the above
- 28.
- A.
Radiation should proceed from as small a focal spot as other considerations will allow
- B.
Radiation should proceed from as large a focal spot as other considerations will allow.
- C.
The film should be as far as possible from the object being radiographed
- D.
The distance from the anode to the material examined should be as small as is practical.
- 29.
- A.
X rays of longer wavelength and more penetrating power are produced
- B.
X rays of shorter wavelength and more penetrating power are produced
- C.
X rays of shorter wavelength and less penetrating power are produced
- D.
X rays of longer wavelength and less penetrating power are produced
- 30.In order to increase the intensity of X-radiation:
- A.
The tube current should be increased
- B.
The tube current should be decreased
- C.
The test specimen should be moved further from the film.
- D.
A lower kilovoltage should be applied to the tube
- 31.Primary radiation which strikes a film holder or cassette through a thin portion of the specimen will cause scattering into the shadows of the adjacent thicker portions producing an effect called:
- A.
Radiation imaging
- B.
Spotting
- C.
Undercut
- D.
Unsharpness
- 32.Scattered radiation caused by any material, such as a wall or floor, table top, or cassette that is located in back of the film is known as:
- A.
Primary scattering
- B.
Undercut
- C.
Reflected scattering
- D.
Backscattered radiation
- 33.Which of the following materials is suitable for use in vessels or pails used to mix processing solutions:
- A.
Stainless steel
- B.
Aluminum
- C.
Galvanized iron
- D.
Tin
- 34.Any of the body tissues may be injured by excessive exposure to X or gamma rays but particularly sensitive are:
- A.
Blood
- B.
Lens of the eye
- C.
Internal organs
- D.
All of the above
- 35.A general rule used to define the amount of radiation exposure that is excessive is:
- A.
Although small amounts of radiation (0.4 R per week or less) are beneficial since they build up an immunity to these rays, anything above 0.4 R per week is excessive
- B.
Any dose over 5 R per week is excessive
- C.
Any dose which causes a mid-range reading on a Geiger counter is excessive
- D.
Any unnecessary exposure to radiation is excessive
- 36.X-ray exposure may be due to:
- A.
The direct beam from the X-ray tube target
- B.
Scatter radiation arising from the object in the direct beam
- C.
Both A and B above
- D.
Both A and B above plus residual radiation that exists for the first few minutes after the X-ray machine has been returned to the "off" position
- 37.A general rune often employed for determining the kilovoltage to be used when X-raying a part is:
- A.
The kilovoltage should be as high as other factors will permit
- B.
The kilovoltage should be as low as other factors will permit
- C.
The kilovoltage is always a fixed value and cannot be changed
- D.
The kilovoltage is not an important variable and can be changed over a wide range without affecting the radiograph
- 38.If a piece of lead 1/2-inch this is placed in the path of a beam of radiation emanating from cobalt-60, it will reduce the dose rate at a given location by:
- A.
One-third
- B.
One-quarter
- C.
One-half
- D.
Three-quarters
- 39.Excessive exposure of film to light prior to development of the film will most likely result in:
- A.
A foggy film
- B.
Poor definition
- C.
Streaks
- D.
Yellow stain
- 40.White crescent-shaped marks on an exposed X-ray film are most likely caused by:
- A.
Crimping film after exposure
- B.
Crimping film before exposure
- C.
Sudden extreme temperature change while processing
- D.
Warm of exhausted fixer
- 41.Reticulation resulting in a puckered or netlike film surface is probably caused by:
- A.
Crimping film after exposure
- B.
Sudden extreme temperature change while processing
- C.
Water or developer on unprocessed film
- D.
Excessive object-to-film distance
- 42.Frilling or loosening of the emulsion from the base of the film is most likely caused by:
- A.
Water of developer on unprocessed film
- B.
Low temperature of processing solutions
- C.
Developer solution contamination
- D.
Warm or exhausted fixer solution
- 43.If an exposure time of 60 seconds was necessary using a 4-foot source-to-film distance for a particular exposure, what time would be necessary if a 2-foot source-to-film distance is used and all other variables remain the same?
- A.
120 seconds
- B.
30 seconds
- C.
15 seconds
- D.
240 seconds
- 44.Although there may be other reasons for using calcium tungstate screens in industrial radiography, they are most usually used to:
- A.
Improve definition and resolution in radiographic images
- B.
Improve contrast in radiographic images
- C.
Decrease exposure time
- D.
Make films respond to multimillion volt radiation
- 45.An excellent radiograph is obtained under given conditions of exposure with the film located at a distance of 36 inches from the target of the X-ray tube. If the film is now placed only 18 inches from the target, and all exposure conditions except time are held constant, the new exposure time will be:
- A.
Unchanged
- B.
Longer by approximately 80 percent
- C.
Shorter by approximately 55 percent
- D.
Only about 25 percent as long as the original exposure time
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