ASNT Study Guide - Industrial Radiography
Radiation Safety questions with accurate answers
A cobalt source has decayed from its original activity after 3 half-lives.
Originally it was 88 Ci (3256 GBq). Its current activity is:
a. 44 Ci (1628 GBq)
b. 22 Ci (814 GBq)
c. 11 Ci (407 GBq)
d. 8 Ci (296 GBq) Ans✓✓✓ c. 11 Ci (407 GBq)
A cobalt source of 73 Ci is exposed for a full 60 min. Assume a 14.0
R/Ci/h factor, shooting through a 3 half-value collimator. What would
the restricted area be on the cold or collimated side of the collimator?
a. 149 ft (45.42 m)
b. 162 ft (49.38 m)
c. 211 ft (64.31 m)
d. 253 ft (77.44m) Ans✓✓✓ d. 253 ft (77.44m)
A control panel in an X-ray system must have clearly visible which of
the following statements?
a. caution: ionizing radiation emitted when energized
b. caution: dangerous radiation emitted when energized
,c. caution: X-rays produced when energized
d. danger: radiation producing device Ans✓✓✓ c. caution: X-rays
produced when energized
A declared pregnant radiographer or assistant may receive no more than
__________ for the entire pregnancy.
a. 500 mR (5000 uSv)
b. 5000 mR (50000 uSv)
c. 100 mR (1000 uSv)
d. 5 R (50 mSv) Ans✓✓✓ a. 500 mR (5000 uSv)
A direct reading ionization chamber, such as a dosimeter, has the
advantage of providing an:
a. accurate dose history for the month
b. immediate dose history since last time charged
c. accurate dose rate
d. immediate dose rate Ans✓✓✓ b. immediate dose history since last
time charged
A dosimeter measures:
a. dose rate
,b. lifetime exposure
c. weekly exposure
d. dose received since the last time it was charged Ans✓✓✓ d. dose
received since the last time it was charged
A dosimeter must be capable of reading a range of:
a. 0-100 mR (0-1 mSv)
b. 0-200 mR (0-2 mSv)
c. 0-500 mR (0-5 mSv)
d. 0-1 R (0-10 mSv) Ans✓✓✓ b. 0-200 mR (0-2 mSv)
A film badge/TLD records what?
a. dose rate
b. exposure rate
c. total dose history for the period worn
d. daily dose Ans✓✓✓ c. total dose history for the period worn
A high radiation area is defined as "an area accessible to individuals, in
which they could receive..."
a. 2 mR/h (20 uSv/h)
b. 5 mR/h (50 uSv/h)
, c. 50 mR/h (500 uSv/h)
d. 100 mR/h (1000 uSv/h) Ans✓✓✓ d. 100 mR/h (1000 uSv/h)
A leak test would be considered failed should the sample tested return a
value greater than:
a. 0.005 Ci (185,000,000 Bq)
b. 0.005 mCi (185,000 Bq)
c. 0.005 uCi (185 Bq)
d. 0.005 nCi (0.185 Bq) Ans✓✓✓ c. 0.005 uCi (185 Bq)
A member of the public or unmonitored individual is allowed to receive
up to, but not to exceed:
a. 2 mR/h, 500 mR/year
(20 uSv/h, 5000 uSv/year)
b. 2 mR/h, 100 mR/year
(20 uSv/h, 1000 uSv/year)
c. 5 mR/h, 100 mR/year
(50 uSv/h, 1000 uSv/year)
d. 5 mR/h, 500 mR/year
(50 uSv/h, 5000 uSv/year) Ans✓✓✓ b. 2 mR/h, 100 mR/year
(20 uSv/h, 1000 uSv/year)
Radiation Safety questions with accurate answers
A cobalt source has decayed from its original activity after 3 half-lives.
Originally it was 88 Ci (3256 GBq). Its current activity is:
a. 44 Ci (1628 GBq)
b. 22 Ci (814 GBq)
c. 11 Ci (407 GBq)
d. 8 Ci (296 GBq) Ans✓✓✓ c. 11 Ci (407 GBq)
A cobalt source of 73 Ci is exposed for a full 60 min. Assume a 14.0
R/Ci/h factor, shooting through a 3 half-value collimator. What would
the restricted area be on the cold or collimated side of the collimator?
a. 149 ft (45.42 m)
b. 162 ft (49.38 m)
c. 211 ft (64.31 m)
d. 253 ft (77.44m) Ans✓✓✓ d. 253 ft (77.44m)
A control panel in an X-ray system must have clearly visible which of
the following statements?
a. caution: ionizing radiation emitted when energized
b. caution: dangerous radiation emitted when energized
,c. caution: X-rays produced when energized
d. danger: radiation producing device Ans✓✓✓ c. caution: X-rays
produced when energized
A declared pregnant radiographer or assistant may receive no more than
__________ for the entire pregnancy.
a. 500 mR (5000 uSv)
b. 5000 mR (50000 uSv)
c. 100 mR (1000 uSv)
d. 5 R (50 mSv) Ans✓✓✓ a. 500 mR (5000 uSv)
A direct reading ionization chamber, such as a dosimeter, has the
advantage of providing an:
a. accurate dose history for the month
b. immediate dose history since last time charged
c. accurate dose rate
d. immediate dose rate Ans✓✓✓ b. immediate dose history since last
time charged
A dosimeter measures:
a. dose rate
,b. lifetime exposure
c. weekly exposure
d. dose received since the last time it was charged Ans✓✓✓ d. dose
received since the last time it was charged
A dosimeter must be capable of reading a range of:
a. 0-100 mR (0-1 mSv)
b. 0-200 mR (0-2 mSv)
c. 0-500 mR (0-5 mSv)
d. 0-1 R (0-10 mSv) Ans✓✓✓ b. 0-200 mR (0-2 mSv)
A film badge/TLD records what?
a. dose rate
b. exposure rate
c. total dose history for the period worn
d. daily dose Ans✓✓✓ c. total dose history for the period worn
A high radiation area is defined as "an area accessible to individuals, in
which they could receive..."
a. 2 mR/h (20 uSv/h)
b. 5 mR/h (50 uSv/h)
, c. 50 mR/h (500 uSv/h)
d. 100 mR/h (1000 uSv/h) Ans✓✓✓ d. 100 mR/h (1000 uSv/h)
A leak test would be considered failed should the sample tested return a
value greater than:
a. 0.005 Ci (185,000,000 Bq)
b. 0.005 mCi (185,000 Bq)
c. 0.005 uCi (185 Bq)
d. 0.005 nCi (0.185 Bq) Ans✓✓✓ c. 0.005 uCi (185 Bq)
A member of the public or unmonitored individual is allowed to receive
up to, but not to exceed:
a. 2 mR/h, 500 mR/year
(20 uSv/h, 5000 uSv/year)
b. 2 mR/h, 100 mR/year
(20 uSv/h, 1000 uSv/year)
c. 5 mR/h, 100 mR/year
(50 uSv/h, 1000 uSv/year)
d. 5 mR/h, 500 mR/year
(50 uSv/h, 5000 uSv/year) Ans✓✓✓ b. 2 mR/h, 100 mR/year
(20 uSv/h, 1000 uSv/year)
