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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) - correct answer-11 Ci (407 Gbq)
A COBALT SOURCE OF &# Ci is exposed for a full 60 min. Assume a 14.0 R/Ci factor,
shooting through a 3 half-value collimator. What would the restricted area be on the cold or
collimated side of the collimator? - correct answer-253 ft (77.44 m)
A control panel in an X-ray system must have clearly visible which of the following
statements? - correct answer-caution: X-rays produced when energized
A declared pregnant radiographer or assistant may receive no more than_______for the
entire pregnancy. - correct answer-500 mR (5000 uSv)
A direct reading ionization chamber, such as a dosimeter, has the advantage of providing an
- correct answer-immediate dose history since last time charged
A dosimeter must be capable of reading a range of - correct answer-0-200 mR (0-2 mSv)
A film badge/TLD records what? - correct answer-total dose history for the period worn
A high radiation area is defined as "an area accessible to individuals, in which they could
receive - correct answer-100 mR/h (1000 uSv/h)
A member of the public or unmonitored individual is allowed to receive up to, but not to
exceed: - correct answer-2 mR/h, 100 mR/year (20 uSv/h, 1000 uSv/year)
A monitored person may receive up to 5000 mR (50 000 uSv) per year. What would be
considered an excessive amount of radiation exposure to that Individual? - correct
answer-any unnecessary exposure to radiation
A non-declared pregnant radiographer or assistant may receive n more than: - correct
answer-5 R per year (50 mSv)
A radiation area is defined as "an area accessible to individuals, in which they could receive
- correct answer-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? - correct answer-8.0 mR (80 uSv)
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? - correct
answer-111.8 ft (34.08 m)
, A radiographer is receiving 100 mR/h (1000 uSv/h) 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)? - correct answer-30 min
A radiographer reads 7.5 on the 10x scale of the survey meter. What is the current dose rate
at that position? - correct answer-75 mR/h
A radiographer's survey meter is showing 0 near the source; it can safely be assumed that -
correct answer-the meter is in an inoperable state; the radiographer should retreat from the
source until an operational meter has replaced the suspect meter
A restricted area is defined as an area - correct answer-to which access is restricted for the
purpose of controlling radiation exposure
A sealed source emits what? - correct answer-gamma rays
A shipping container is surveyed and found to be 3 mR/h at 39.37 in. (30 uSv/h at 1 m).
What label would be required? - correct answer-Yellow III
A source is being transported with a surface reading of 25 mR and 3 mR at 39.37 in. (250
uSv and 30 uSv at 1 m). Which transport label must be used? - correct answer-Yellow III
A source must be leaked tested - correct answer-every six months
A survey instrument must be capable of an accuracy of: - correct answer-plus/minus 20%
A survey meter must becapable of measuring a range of - correct answer-2 to 1000 mR/h
(0.02 to 10 mSv/h)
A thickness of 0.19 in. (4.83 mm) of lead will reduce the exposure of Ir-192 to one-half its
original intensity. This is known as the: - correct answer-half-value layer of lead for the
energies associated with Ir-192
A tube through which the radioactive source travels when inside a radiographic exposure
device is a/an - correct answer-S tube
A utilization log must include at a minimum - correct answer-make, model and serial number
of the exposure device
a White transport label maximum transport index is - correct answer-less than 0.5
A Yellow II transport label maximum transport index is: - correct answer-1
A Yellow III transport label maximum transport index is: - correct answer-more than 1, but
less than 10 measure at 39.37 in. (1 m)
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