ASNT LEVEL II Review
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1. Low-voltage X-ray tubes are generally fitted with win- b. beryllium.
dows made of:
a. plastic.
b. beryllium.
c. glass.
d. lead.
2. The projected area of the target of an X-ray tube is c. effective focal spot.
called the:
a. focal spot.
b. focus.
c. effective focal spot.
d. geometric unsharpness.
3. The general method of producing X-rays involves the c. target.
sudden deceleration of high-velocity electrons in a
solid body called a:
a. focus cup.
b. filament.
c. target.
d. cathode.
4. f it were necessary to radiograph a 7 in. (177.8 mm) a. Co-60
thick steel product, which of the following gamma-ray
sources would most likely be used?
a. Co-60
b. Tm-170
c. Ir-192
d. Cs-137
5. A Co-60 gamma-ray source has an approximate prac- c. 8 in. (203.2 mm) of steel
tical thickness limit of: or its equivalent.
, ASNT LEVEL II Review
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a. 2.5 in. (63.5 mm) of steel or its equivalent.
b. 4 in. (101.6 mm) of steel or its equivalent.
c. 8 in. (203.2 mm) of steel or its equivalent.
d. 11 in. (279.4 mm) of steel or its equivalent.
6. The absorption of gamma rays from a given source a. the atomic number,
when passing through matter depends on: density, and thickness of
a. the atomic number, density, and thickness of the the matter.
matter.
b. Young's modulus value of the matter.
c. Poisson's ratio value of the matter.
d. the specific activity value of the source.
7. The fact that gases, when bombarded by radia- d. radiation detection
tion, ionize and become electrically conductive makes equipment.
them useful in:
a. X-ray transformers.
b. X-ray tubes.
c. masks.
d. radiation detection equipment.
8. The velocity of electrons striking the target in an X-ray c. voltage difference be-
tube is a function of the: tween the cathode and
a. atomic number of the cathode material. anode.
b. atomic number of the filament material.
c. voltage difference between the cathode and anode.
d. current flow in the rectifier circuit.
9. The uneven distribution of developed grains within a. graininess.
the emulsion of a processed X-ray film causes the
subjective impression of:
a. graininess.
b. streaks.
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c. spots.
d. white scum.
10. Co-60 is reported to have a half-life of 5.3 years. By c. Exposure time should
how much should exposure time be increased (over be about 37% longer.
that used initially to produce excellent radiographs
when the Co-60 source was new) when the source is 2
years old?
a. No change in exposure time is needed.
b. Exposure time should be about 11% longer.
c. Exposure time should be about 37% longer.
d. Exposure time should be about 62% to 100% longer.
11. A source of Ir-192, whose half-life is 75 days, provides c. 1 h and 20 min
an optimum exposure of a given test object today
in a period of 20 min. Five months from now, what
exposure time would be required for the same radi-
ographic density, under similar exposure conditions?
a. 10 min
b. 20 min
c. 1 h and 20 min
d. 6 h
12. Of the following, the source providing the most pene- c. 15 MeV X-ray betatron.
trating radiation is:
a. Co-60.
b. 220 kVp X-ray tube.
c. 15 MeV X-ray betatron.
d electrons from Ir-192.
13. The gamma ray intensity at 1 ft (300 mm) from a 1 Ci a. 15 R per hour (150 mSv
(37 GBq) source of radioactive Co-60 is nearest to: per hour).
a. 15 R per hour (150 mSv per hour).
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b. 1000 R per hour (10 000 mSv per hour).
c. 1 R per min (10 mSv per min).
d. 10 mR per day (100 μSv per day).
14. The focal spot in an X-ray tube: d. should be as small as
a. is inclined at an angle of 30° from normal to the tube possible without unduly
axis. shortening the life of the
b. is maintained at a high negative voltage during tube.
operations.
c. should be as large as possible to ensure a narrow
beam of primary radiation.
d. should be as small as possible without unduly short-
ening the life of the tube.
15. In an X-ray tube, the filament and focusing cup are the b. cathode.
two essential parts of the:
a. anode.
b. cathode.
c. rectifier.
d. X-ray transformer
16. The quantity of radiation that will produce, by means c. roentgen.
of ionization, 1 electrostatic unit of electricity in
0.001293 g of dry air is known as a:
a. millicurie.
b. gamma.
c. roentgen.
d. curie.
17. The specific activity of an isotopic source is usually b. curies per gram (Ci/g)
measured in: [becquerel per gram
a. million electronvolts (MeV). (Bq/g)].
b. curies per gram (Ci/g) [becquerel per gram (Bq/g)].
Study online at https://quizlet.com/_gn310l
1. Low-voltage X-ray tubes are generally fitted with win- b. beryllium.
dows made of:
a. plastic.
b. beryllium.
c. glass.
d. lead.
2. The projected area of the target of an X-ray tube is c. effective focal spot.
called the:
a. focal spot.
b. focus.
c. effective focal spot.
d. geometric unsharpness.
3. The general method of producing X-rays involves the c. target.
sudden deceleration of high-velocity electrons in a
solid body called a:
a. focus cup.
b. filament.
c. target.
d. cathode.
4. f it were necessary to radiograph a 7 in. (177.8 mm) a. Co-60
thick steel product, which of the following gamma-ray
sources would most likely be used?
a. Co-60
b. Tm-170
c. Ir-192
d. Cs-137
5. A Co-60 gamma-ray source has an approximate prac- c. 8 in. (203.2 mm) of steel
tical thickness limit of: or its equivalent.
, ASNT LEVEL II Review
Study online at https://quizlet.com/_gn310l
a. 2.5 in. (63.5 mm) of steel or its equivalent.
b. 4 in. (101.6 mm) of steel or its equivalent.
c. 8 in. (203.2 mm) of steel or its equivalent.
d. 11 in. (279.4 mm) of steel or its equivalent.
6. The absorption of gamma rays from a given source a. the atomic number,
when passing through matter depends on: density, and thickness of
a. the atomic number, density, and thickness of the the matter.
matter.
b. Young's modulus value of the matter.
c. Poisson's ratio value of the matter.
d. the specific activity value of the source.
7. The fact that gases, when bombarded by radia- d. radiation detection
tion, ionize and become electrically conductive makes equipment.
them useful in:
a. X-ray transformers.
b. X-ray tubes.
c. masks.
d. radiation detection equipment.
8. The velocity of electrons striking the target in an X-ray c. voltage difference be-
tube is a function of the: tween the cathode and
a. atomic number of the cathode material. anode.
b. atomic number of the filament material.
c. voltage difference between the cathode and anode.
d. current flow in the rectifier circuit.
9. The uneven distribution of developed grains within a. graininess.
the emulsion of a processed X-ray film causes the
subjective impression of:
a. graininess.
b. streaks.
, ASNT LEVEL II Review
Study online at https://quizlet.com/_gn310l
c. spots.
d. white scum.
10. Co-60 is reported to have a half-life of 5.3 years. By c. Exposure time should
how much should exposure time be increased (over be about 37% longer.
that used initially to produce excellent radiographs
when the Co-60 source was new) when the source is 2
years old?
a. No change in exposure time is needed.
b. Exposure time should be about 11% longer.
c. Exposure time should be about 37% longer.
d. Exposure time should be about 62% to 100% longer.
11. A source of Ir-192, whose half-life is 75 days, provides c. 1 h and 20 min
an optimum exposure of a given test object today
in a period of 20 min. Five months from now, what
exposure time would be required for the same radi-
ographic density, under similar exposure conditions?
a. 10 min
b. 20 min
c. 1 h and 20 min
d. 6 h
12. Of the following, the source providing the most pene- c. 15 MeV X-ray betatron.
trating radiation is:
a. Co-60.
b. 220 kVp X-ray tube.
c. 15 MeV X-ray betatron.
d electrons from Ir-192.
13. The gamma ray intensity at 1 ft (300 mm) from a 1 Ci a. 15 R per hour (150 mSv
(37 GBq) source of radioactive Co-60 is nearest to: per hour).
a. 15 R per hour (150 mSv per hour).
, ASNT LEVEL II Review
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b. 1000 R per hour (10 000 mSv per hour).
c. 1 R per min (10 mSv per min).
d. 10 mR per day (100 μSv per day).
14. The focal spot in an X-ray tube: d. should be as small as
a. is inclined at an angle of 30° from normal to the tube possible without unduly
axis. shortening the life of the
b. is maintained at a high negative voltage during tube.
operations.
c. should be as large as possible to ensure a narrow
beam of primary radiation.
d. should be as small as possible without unduly short-
ening the life of the tube.
15. In an X-ray tube, the filament and focusing cup are the b. cathode.
two essential parts of the:
a. anode.
b. cathode.
c. rectifier.
d. X-ray transformer
16. The quantity of radiation that will produce, by means c. roentgen.
of ionization, 1 electrostatic unit of electricity in
0.001293 g of dry air is known as a:
a. millicurie.
b. gamma.
c. roentgen.
d. curie.
17. The specific activity of an isotopic source is usually b. curies per gram (Ci/g)
measured in: [becquerel per gram
a. million electronvolts (MeV). (Bq/g)].
b. curies per gram (Ci/g) [becquerel per gram (Bq/g)].
