Radiography Questions
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Level 1 Radiography test - 135+ multiple choice questions
- 1.
- 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
- 2.
- 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
- 3.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
- 4.
- 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
- 5.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
- 6.The penetrating ability of an X-ray beam is governed by:
- A.
Kilovoltage or wavelength
- B.
Time
- C.
Milliamperage
- D.
Source-to-film distance
- 7.Cobalt-60 used in nondestructive testing emits:
- A.
Alpha particles
- B.
Neutrons
- C.
Gamma rays
- D.
X rays
- 8.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
- 9.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
- 10.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
- 11.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
- 12.What does the term R/hr refer to when speaking of intensity:
- A.
Radiation limits for humans
- B.
Roentgens per hour
- C.
X rays per hour
- D.
Radiation in hydrogen
- 13.The ability to detect a small discontinuity or flaw is called:
- A.
Radiographic contrast
- B.
Radiographic sensitivity
- C.
Radiographic density
- D.
Radiographic resolution
- 14.Movement, geometry, and screen contact are three factors that affect radiographic:
- A.
Contrast
- B.
Unsharpness
- C.
Reticulation
- D.
Density
- 15.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
- 16.
- 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.
- 17.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
- 18.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
- 19.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
- 20.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
- 21.
- 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
- 22.
- 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
- 23.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
- 24.A cobalt-60 source has a half-life of
- A.
1.2 years
- B.
6 months
- C.
5.3 years
- D.
75 days
- 25.
- 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
- 26.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
- 27.
- 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
- 28.Fluorescent intensifying screens are usually mounted in pairs in rigid holders called:
- A.
Film racks
- B.
Cassettes
- C.
Emulsifiers
- D.
Diaphragms
- 29.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
- 30.
- 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.
- 31.
- 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
- 32.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
- 33.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
- 34.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
- 35.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
- 36.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
- 37.
- 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
- 38.
- 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
- 39.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
- 40.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
- 41.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
- 42.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
- 43.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
- 44.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
- 45.
- A.
120 seconds
- B.
30 seconds
- C.
15 seconds
- D.
240 seconds
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