ASNT RT I EXAM 120 QUESTIONS AND CORRECT DETAILED ANSWERS
UPDATE ALREADY A GRADE|NEW!
Although there may be other reasons for using calcium tungstate screens in industrial
radiography, they are most usually used to: - correct answer Decrease exposure time
In film radiography, pentrameters are usually placed: - correct answer on the source side of the
test object
The penetrating ability of an x-ray beam is governed by: - correct answer Kilovoltage
Co-60 used in nondestructive testing emits: - correct answer Gamma rays
A densitometer is an instrument for measuring: - correct answer film density
Three liquids which are essential to process an exposed film properly are: - correct answer
Developer, fixer and water
The two most common causes for excessively high-density radiographs are: - correct answer
overexposure and underdevelopment
the time required for one-half of the atoms in a particular sample of radioactive material to
disintegrate is called: - correct answer a half- life
What does the term R/h refer to when speaking of intensity? - correct answer Roentgens per
hour
The ability to detect a small discontinuity or flaw is called: - correct answer radiographic
sensitivity
Movement, geometry, and screen contact are three factors that affect radiographic: - correct
answer unsharpness
The difference between the densities of two areas of a radiograph is called: - correct answer
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: - correct answer curie
Exposure to x-rays or gamma rays will have what effect on the body? - correct answer It may
have a cumulative effect which must be considered
Which dose would be dangerous, if not fatal, if applied to the entire body in a short period of
time?
A. 1.5 - 15R
B. 25 - 70R
, C. 200 - 800R
D. All of the above doses would most likely be fatal - correct answer C. 200 - 800 R
When doing gamma ray radiography with high- intensity emitters, the sources are best
handled: - correct answer by remote handling equipment
If a film is placed in a developer solution and allowed to develop without any agitation: - correct
answer There will be a tendency for areas to affect each other
The selection of the proper type of film to be used for the x-ray examination of a particular part
depends on: - correct answer the thickness of the part, the material of the specimen, the
voltage range of the available x-ray machine
A Co-60 source has a half life of: - correct answer 5.3 Years
x-ray tube current is controlled by: - correct answer the current passing through the filament
The voltage and waveform applied to the x-ray tube by a high- voltage transformer primarily
determines the: - correct answer penetrating ability
lead foil in direct contact with x-ray film: - correct answer Intensifies the primary radiation
more than the scatter radiation
Fluorescent intensifying screens are usually mounted in pairs in rigid holders called: - correct
answer Cassettes
Radiographic sensitivity, in the context of the minimum detectable flaw size, depends on: -
correct answer graininess of the film, the unsharpness of the flaw image in the film and the
contrast the flaw image on the film
In order to decrease geometric unsharpness: - correct answer Radiation should proceed from
as small a focal spot as other considerations will allow
As the Kilovoltage applied to the x-ray tube is raised: - correct answer x-rays of shorter
wavelength and more penetrating power are produced
In order to increase the intensity of the x-radiation: - correct answer the tube current should be
increased
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 and effect
called: - correct answer undercut
scattered radiation caused by any material, such as a wall or floor, on the film side of the
specimen is referred to as: - correct answer backscattered radiation
UPDATE ALREADY A GRADE|NEW!
Although there may be other reasons for using calcium tungstate screens in industrial
radiography, they are most usually used to: - correct answer Decrease exposure time
In film radiography, pentrameters are usually placed: - correct answer on the source side of the
test object
The penetrating ability of an x-ray beam is governed by: - correct answer Kilovoltage
Co-60 used in nondestructive testing emits: - correct answer Gamma rays
A densitometer is an instrument for measuring: - correct answer film density
Three liquids which are essential to process an exposed film properly are: - correct answer
Developer, fixer and water
The two most common causes for excessively high-density radiographs are: - correct answer
overexposure and underdevelopment
the time required for one-half of the atoms in a particular sample of radioactive material to
disintegrate is called: - correct answer a half- life
What does the term R/h refer to when speaking of intensity? - correct answer Roentgens per
hour
The ability to detect a small discontinuity or flaw is called: - correct answer radiographic
sensitivity
Movement, geometry, and screen contact are three factors that affect radiographic: - correct
answer unsharpness
The difference between the densities of two areas of a radiograph is called: - correct answer
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: - correct answer curie
Exposure to x-rays or gamma rays will have what effect on the body? - correct answer It may
have a cumulative effect which must be considered
Which dose would be dangerous, if not fatal, if applied to the entire body in a short period of
time?
A. 1.5 - 15R
B. 25 - 70R
, C. 200 - 800R
D. All of the above doses would most likely be fatal - correct answer C. 200 - 800 R
When doing gamma ray radiography with high- intensity emitters, the sources are best
handled: - correct answer by remote handling equipment
If a film is placed in a developer solution and allowed to develop without any agitation: - correct
answer There will be a tendency for areas to affect each other
The selection of the proper type of film to be used for the x-ray examination of a particular part
depends on: - correct answer the thickness of the part, the material of the specimen, the
voltage range of the available x-ray machine
A Co-60 source has a half life of: - correct answer 5.3 Years
x-ray tube current is controlled by: - correct answer the current passing through the filament
The voltage and waveform applied to the x-ray tube by a high- voltage transformer primarily
determines the: - correct answer penetrating ability
lead foil in direct contact with x-ray film: - correct answer Intensifies the primary radiation
more than the scatter radiation
Fluorescent intensifying screens are usually mounted in pairs in rigid holders called: - correct
answer Cassettes
Radiographic sensitivity, in the context of the minimum detectable flaw size, depends on: -
correct answer graininess of the film, the unsharpness of the flaw image in the film and the
contrast the flaw image on the film
In order to decrease geometric unsharpness: - correct answer Radiation should proceed from
as small a focal spot as other considerations will allow
As the Kilovoltage applied to the x-ray tube is raised: - correct answer x-rays of shorter
wavelength and more penetrating power are produced
In order to increase the intensity of the x-radiation: - correct answer the tube current should be
increased
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 and effect
called: - correct answer undercut
scattered radiation caused by any material, such as a wall or floor, on the film side of the
specimen is referred to as: - correct answer backscattered radiation
