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Level 1 ASNT Questions with Detailed Verified Answers
Although there may be other reasons for using calcium tungstate screens in industrial radiography
they are most usually used to: Ans: ✓ ✓ ✓ decrease exposure time
An excellent radiograph is obtained under given conditions of exposure with the film located at a
distance of 91 cm (36 in.) from the target of the X-ray tube. If the film is now placed only 46cm
(18in.) from the target, and all exposure conditions except time are held constant, the new
exposure time will be: Ans: ✓ ✓ ✓ only about 25 percent as long as the original exposure time
An excellent radiograph is obtained under given exposure conditions with a tube current of 5 ma
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 10ma? Ans: ✓ ✓ ✓ 6 minutes
In film radiography, penetrometers are usually placed: Ans: ✓ ✓ ✓ on the source side of the test
object
When radiographing to the 2-2T quality level, an ASTM penetrometer for 13mm (0.5in) thick 2024
aluminum alloy has a thickness of: Ans: ✓ ✓ ✓ 25 X 10-`5m (10mils)
The penetrating ability of an X-ray beam is governed by: Ans: ✓ ✓ ✓ kilovoltage
Co-60 used in nondestructive testing emits: Ans: ✓ ✓ ✓ gamma rays
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A densitometer is an instrument for measuring: Ans: ✓ ✓ ✓ film density
Three liquids which are essential to process an eposed film properly are: Ans: ✓ ✓ ✓ developer,
fixer, and water
The two most common causes for excessively high-density radiographs are: Ans: ✓ ✓ ✓
overexposure and overdevelopment
The time required for one-half of the atoms in a particular sample of radioactive material to
disintegrate is called: Ans: ✓ ✓ ✓ a half-life
What does the term R/h refer to when speaking of intensity? Ans: ✓ ✓ ✓ roentgens per hour
The ability to detect a small discontinuity or flaw is called: Ans: ✓ ✓ ✓ radiographic sensitivity
Movement, geometry, and screen contact are three factors that affect radiographic Ans: ✓ ✓ ✓
unsharpness
The difference between the densities of two areas of a radiograph is called: Ans: ✓ ✓ ✓
radiographic contrast
The most widely used unit of measurement for measuring the rate at which the output of a gamma
ray source decays is the: Ans: ✓ ✓ ✓ curie
Exposure to X-rays or gamma rays: Ans: ✓ ✓ ✓ may have a cumulative effect which must be
considered
Which does would be dangerous, if not fatal, if applied to the entire body in a shor t period of time?
Ans: ✓ ✓ ✓ 200-800 R
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Level 1 ASNT Questions with Detailed Verified Answers
Although there may be other reasons for using calcium tungstate screens in industrial radiography
they are most usually used to: Ans: ✓ ✓ ✓ decrease exposure time
An excellent radiograph is obtained under given conditions of exposure with the film located at a
distance of 91 cm (36 in.) from the target of the X-ray tube. If the film is now placed only 46cm
(18in.) from the target, and all exposure conditions except time are held constant, the new
exposure time will be: Ans: ✓ ✓ ✓ only about 25 percent as long as the original exposure time
An excellent radiograph is obtained under given exposure conditions with a tube current of 5 ma
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 10ma? Ans: ✓ ✓ ✓ 6 minutes
In film radiography, penetrometers are usually placed: Ans: ✓ ✓ ✓ on the source side of the test
object
When radiographing to the 2-2T quality level, an ASTM penetrometer for 13mm (0.5in) thick 2024
aluminum alloy has a thickness of: Ans: ✓ ✓ ✓ 25 X 10-`5m (10mils)
The penetrating ability of an X-ray beam is governed by: Ans: ✓ ✓ ✓ kilovoltage
Co-60 used in nondestructive testing emits: Ans: ✓ ✓ ✓ gamma rays
© Get it right 2025 Getaway - Stuvia US All rights reserved
, Click here for more: Scholars nexus
A densitometer is an instrument for measuring: Ans: ✓ ✓ ✓ film density
Three liquids which are essential to process an eposed film properly are: Ans: ✓ ✓ ✓ developer,
fixer, and water
The two most common causes for excessively high-density radiographs are: Ans: ✓ ✓ ✓
overexposure and overdevelopment
The time required for one-half of the atoms in a particular sample of radioactive material to
disintegrate is called: Ans: ✓ ✓ ✓ a half-life
What does the term R/h refer to when speaking of intensity? Ans: ✓ ✓ ✓ roentgens per hour
The ability to detect a small discontinuity or flaw is called: Ans: ✓ ✓ ✓ radiographic sensitivity
Movement, geometry, and screen contact are three factors that affect radiographic Ans: ✓ ✓ ✓
unsharpness
The difference between the densities of two areas of a radiograph is called: Ans: ✓ ✓ ✓
radiographic contrast
The most widely used unit of measurement for measuring the rate at which the output of a gamma
ray source decays is the: Ans: ✓ ✓ ✓ curie
Exposure to X-rays or gamma rays: Ans: ✓ ✓ ✓ may have a cumulative effect which must be
considered
Which does would be dangerous, if not fatal, if applied to the entire body in a shor t period of time?
Ans: ✓ ✓ ✓ 200-800 R
© Get it right 2025 Getaway - Stuvia US All rights reserved
