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ASNT Study Guide - Industrial Radiography Radiation Safety questions and answers.
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ASNT Study Guide - IndustrialRadiography Radiation Safety
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) - correct answer-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) - correct answer-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 - correct answer-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) - correct answer-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 - correct answer-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 - correct answer-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) - correct answer-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 - correct answer-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) - correct answer-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) - correct answer-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) - correct answer-b. 2 mR/h, 100 mR/year
(20 uSv/h, 1000 uSv/year)
,A monitored person may receive up to 5000 mR (50000 uSv) per year. What would be
considered an excessive amount of radiation exposure to that individual?
a. exposures of more than 100 mR (1000 uSv) in one week.
b. any exposure over 1250 mR (12500 uSv) in a quarter.
c. any unnecessary exposure to radiation
d. exposures of 500 mR/h (5000 uSv) - correct answer-c. any unnecessary exposure to
radiation
A non-declared pregnant radiographer or assistant may receive no more than:
a. 0.5 rem per year (5 mSv)
b. 5000 rem per year (50 Sv)
c. 100 mR per year (1000 uSv)
d. 5 R per year (50 mSv) - correct answer-d. 5 R per year (50 mSv)
A 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) - correct answer-b. 5 mR/h (50 uSv/h)
A radiographer and assistant are standing in a 2 mR/h (20 uSv/h) field. What would the
assistant's total dose be after 4 h?
a. 2.0 mR (20 uSv)
b. 4.0 mR (40 uSv)
c. 6.0 mR (60 uSv)
d. 8.0 mR (80 uSv) - correct answer-d. 8.0 mR (80 uSv)
A radiographer has several avenues to seek guidance and counsel. The first person he or
she can turn to is?
a. their state or federal jurisdiction's hotline
b. their program's radiation safety officer (RSO)
c. a senior technician
d. the NRC - correct answer-b. their program's radiation safety officer (RSO)
A radiographer is receiving 100 mR (1000 uSv) at the crank assembly. The crank assembly
is 25 ft (7.62 m) in length. How long will it take for the radiographer to receive a total dose of
50 mR (500 uSv)?
a. 30 min
b. 60 min
c. 90 min
, d. 120 min - correct answer-a. 30 min
A radiographer is receiving 100 mR (1000 uSv) at the crank assembly. The crank assembly
is 25 ft (7.62 m) in length. Where would the "RADIATION AREA" sign be posted?
a. 111.8 ft (34.08 m)
b. 221.3 ft (67.45 m)
c. 343.7 ft (104.76 m)
d. 176.8 ft (53.89 m) - correct answer-a. 111.8 ft (34.08 m)
A radiographer reads 7.5 on the 10x scale of the survey meter. What is the current dose rate
at that position?
a. 7.5 mR/h
b. 75 mR/h
c. 750 mR/h
d. 7.5 R/h - correct answer-b. 75 mR/h
A radiographer's survey meter is showing 0 near the source; it can be safely assumed that:
a. there is no radiation present
b. the meter is inoperable and should be repaired when the shift is over
c. the meter may be inoperable and a replacement should be used immediately
d. the meter is in an inoperable state; the radiographer should retreat form the source until
an operational meter has replaced the suspect meter - correct answer-d. the meter is in an
inoperable state; the radiographer should retreat form the source until an operational meter
has replaced the suspect meter
A rate alarm meter or alarming rate meter must sound a
continuous audible alarm greater than 80 dB at 1 ft (0.3 m) at:
a. 500 mR/h (5000 uSv/h)
b. 400 mR/h (4000 uSv/h)
c. 100 mR/h (1000 uSv/h)
d. 2 mR/h (20 uSv/h) - correct answer-a. 500 mR/h (5000 uSv/h)
A restricted area is defined as an area:
a. that is controlled and posted
b. that must be posted and where an individual may receive up to 5 mR/h (50 uSv/h)
c. that must be posted and where an individual may receive up to 100 mR/h (1000 uSv/h)
d. to which access is restricted for the purpose of controlling radiation exposure - correct
answer-d. to which access is restricted for the purpose of controlling radiation exposure
A sealed source emits what?
a. alpha particles
b. beta particles
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