ASNT LEVEL III STUDY GUIDE - INDUSTRIAL RADIOGRAPHY
RADIATION SAFETY EXAM 2026 LATEST UPDATE QUESTIONS
AND CORRECT VERIFIED ANSWERS ALREDY GRADED A+
Shielding can be expressed by the amount of shielding provided, so that the amount of
shielding that would reduce the original exposure rate to one-half would be stated as:
a. 1 half-value layer
b. 1 tenth-value layer
c. 1 layer
d. 10 layers - ANS-a. 1 half-value layer
The best material to use as shielding would be:
a. paper
b. plastic
c. wood
d. lead - ANS-d. lead
When using lead to shield an Ir-192 source, you would need ________ to reduce the original
exposure to one-half.
a. 0.2 in. (5.08 mm)
b. 0.25 in. (6.35 mm)
c. 0.3 in. (7.62 mm)
d. 0.5 in. (12.7 mm) - ANS-a. 0.2 in. (5.08 mm)
,Standing in a 100 mR/h (1000 uSv/h) field, the radiographer will make four 10 min exposures.
The radiographer's total exposure for the day would be:
a. 25 mR (250 uSv)
b. 66.7 mR (667 uSv)
c. 66.7 mR/h (677 uSv/h)
d. 400 mR (4000 uSv) - ANS-b. 66.7 mR (667 uSv)
With 30 Ci of iridium with a gamma constant of 5.2 R/h/Ci at 1 ft (52 mSv/h/Ci at 0.3 m), what
would your exposure rate be at 1 ft (0.3 m) from the source?
a. 156 mR/h (1560 uSv/h)
b. 156 R/h (1560 mSv/h)
c. 156 R (1560 mSv)
d. 156 mR (1560 uSv) - ANS-b. 156 R/h (1560 mSv/h)
If you have 73 Ci of Co-60, your exposure rate at 2 ft (0.6 m) from the source would be?
a. 511 R (5110 mSv)
b. 264.6 R (2646 mSv)
c. 262.8 R (2628 mSv)
d. 255.5 R (2555 mSv) - ANS-d. 255.5 R (2555 mSv)
You have an intensity of 50 mR/h at 100 ft (50 uSv/h at 30.48m) from a source. Moving to 50 ft
(15.24m) would increase your exposure rate by a factor of what?
,a. 2 times
b. 3 times
c. 5 times
d. 4 times - ANS-d. 4 times
If the radiographer has 100 mR/h at 25 ft (1000 uSv at 7.63 m), the exposure rate at 50 ft (15.24
m) would be ______ with 1 half-value of shielding between the radiographer and the source.
a. 25 mR/h (250 uSv/h)
b. 12.5 mR/h (125 uSv/h)
c. 25 mR (250 uSv)
d. 12.5 mR (125 uSv) - ANS-b. 12.5 mR/h (125 uSv/h)
There are ______ type(s) of installations used in radiography.
a. 1
b. 2
c. 3
d. 4 - ANS-d. 4
The most common type of installation used in field radiography is:
a. open
b. protective
c. enclosed
d. unattended - ANS-a. open
, How many survey meters are required when conducting radiographic operations?
a. 1
b. 2
c. 3
d. one for each radiographer and assistant
e. a sufficient number of calibrated and operable survey meters - ANS-e. a sufficient number of
calibrated and operable survey meters
Radiation survey equipment shall be calibrated __________, and have an overall accuracy of
__________.
a. annually; 10%
b. semiannually; ±10%
c. annually; ±20%
d. semiannually; 20%
e. semiannually; ±20% - ANS-e. semiannually; ±20%
Which personnel monitoring devices are required prior to performing radiography, excluding
permanent installations?
a. direct reading dosimeter, operating rate alarm, personnel dosimeter
b. direct reading dosimeter, film badge, survey meter, operating rate alarm
c. operating rate alarm, survey meter, dosimeter, film badge/TLD
d. survey meter, dosimeter, film badge - ANS-a. direct reading dosimeter, operating rate alarm,
personnel dosimeter
RADIATION SAFETY EXAM 2026 LATEST UPDATE QUESTIONS
AND CORRECT VERIFIED ANSWERS ALREDY GRADED A+
Shielding can be expressed by the amount of shielding provided, so that the amount of
shielding that would reduce the original exposure rate to one-half would be stated as:
a. 1 half-value layer
b. 1 tenth-value layer
c. 1 layer
d. 10 layers - ANS-a. 1 half-value layer
The best material to use as shielding would be:
a. paper
b. plastic
c. wood
d. lead - ANS-d. lead
When using lead to shield an Ir-192 source, you would need ________ to reduce the original
exposure to one-half.
a. 0.2 in. (5.08 mm)
b. 0.25 in. (6.35 mm)
c. 0.3 in. (7.62 mm)
d. 0.5 in. (12.7 mm) - ANS-a. 0.2 in. (5.08 mm)
,Standing in a 100 mR/h (1000 uSv/h) field, the radiographer will make four 10 min exposures.
The radiographer's total exposure for the day would be:
a. 25 mR (250 uSv)
b. 66.7 mR (667 uSv)
c. 66.7 mR/h (677 uSv/h)
d. 400 mR (4000 uSv) - ANS-b. 66.7 mR (667 uSv)
With 30 Ci of iridium with a gamma constant of 5.2 R/h/Ci at 1 ft (52 mSv/h/Ci at 0.3 m), what
would your exposure rate be at 1 ft (0.3 m) from the source?
a. 156 mR/h (1560 uSv/h)
b. 156 R/h (1560 mSv/h)
c. 156 R (1560 mSv)
d. 156 mR (1560 uSv) - ANS-b. 156 R/h (1560 mSv/h)
If you have 73 Ci of Co-60, your exposure rate at 2 ft (0.6 m) from the source would be?
a. 511 R (5110 mSv)
b. 264.6 R (2646 mSv)
c. 262.8 R (2628 mSv)
d. 255.5 R (2555 mSv) - ANS-d. 255.5 R (2555 mSv)
You have an intensity of 50 mR/h at 100 ft (50 uSv/h at 30.48m) from a source. Moving to 50 ft
(15.24m) would increase your exposure rate by a factor of what?
,a. 2 times
b. 3 times
c. 5 times
d. 4 times - ANS-d. 4 times
If the radiographer has 100 mR/h at 25 ft (1000 uSv at 7.63 m), the exposure rate at 50 ft (15.24
m) would be ______ with 1 half-value of shielding between the radiographer and the source.
a. 25 mR/h (250 uSv/h)
b. 12.5 mR/h (125 uSv/h)
c. 25 mR (250 uSv)
d. 12.5 mR (125 uSv) - ANS-b. 12.5 mR/h (125 uSv/h)
There are ______ type(s) of installations used in radiography.
a. 1
b. 2
c. 3
d. 4 - ANS-d. 4
The most common type of installation used in field radiography is:
a. open
b. protective
c. enclosed
d. unattended - ANS-a. open
, How many survey meters are required when conducting radiographic operations?
a. 1
b. 2
c. 3
d. one for each radiographer and assistant
e. a sufficient number of calibrated and operable survey meters - ANS-e. a sufficient number of
calibrated and operable survey meters
Radiation survey equipment shall be calibrated __________, and have an overall accuracy of
__________.
a. annually; 10%
b. semiannually; ±10%
c. annually; ±20%
d. semiannually; 20%
e. semiannually; ±20% - ANS-e. semiannually; ±20%
Which personnel monitoring devices are required prior to performing radiography, excluding
permanent installations?
a. direct reading dosimeter, operating rate alarm, personnel dosimeter
b. direct reading dosimeter, film badge, survey meter, operating rate alarm
c. operating rate alarm, survey meter, dosimeter, film badge/TLD
d. survey meter, dosimeter, film badge - ANS-a. direct reading dosimeter, operating rate alarm,
personnel dosimeter
