40 HOUR RADIATION SAFETY EXAM SCRIPT 2025/2026
QUESTIONS WITH ANSWERS GRADED A+
✔✔the fact that gasses bombarded by ionizing radiation become conductors of
electrical current make them useful in - ✔✔detection equipment
✔✔a dosimeter must be capable of reading a range of - ✔✔0-200 mR (0-2mSv)
✔✔pocket ion chambers must be capable of reading - ✔✔200 mR (2mSv)
✔✔an exposure rate is measured by - ✔✔survey meter
✔✔what dosimeters (dosimetric devices) are last affected by moisture - ✔✔TLDs
✔✔full deflection of a survey meter while on batter check means - ✔✔meter may or may
not be working properly
✔✔dosimeters must be calibrated at intervals not to exceed - ✔✔annually
✔✔rate alarms must be calibrated at intervals not to exceed - ✔✔yearly
✔✔a film badge/TLD records what - ✔✔total dose history for the period worn
✔✔when performing radiography in a permanent radiographic installation equipped with
an area monitor, the technician is not required to - ✔✔wear a rate alarm
✔✔a direct reading ionization chamber, such as a dosimeter, has the advantage of
providing an - ✔✔immediate dose history since last time charged
✔✔a radiographers survey meter is sowing 0 near the source; it can safely be assumed
that: - ✔✔the meter is in an inoperable state, the radiographer should retreat from the
source until an operational meter has replaced the suspect meter
✔✔a radiographer reads 7.5 on the 10x scale of the survey meter. what is the current
dose rate at that position - ✔✔75 mR/h
✔✔after 6 half-value layers, what percentage of radiation would be received - ✔✔1.6%
✔✔assuming a source has a half-life of 20 years, how old would the source be in 3 half-
lives - ✔✔60 years
✔✔if a radiographer has 60 mR (0.6 mSv) at the surface of the exposure device, what
would the reading be after 2 half lives - ✔✔15mR
, ✔✔a sealed source emits what - ✔✔gamma rays
✔✔the ball on a source assembly that prevents the source from exiting through the
back of the camera is called - ✔✔safety stop ball
✔✔emission of gamma rays, alpha rays and beta rays is considered what -
✔✔characteristics of source decay
✔✔to penetrate a thicker or denser material, you would need a source with - ✔✔more
energy (shorter wavelength)
✔✔an element's weight is the - ✔✔A number
✔✔an element is identified by the number of _________ in its nucleus - ✔✔protons
✔✔the first indication of an extremity radiation overexposure is - ✔✔reddening of the
skin
✔✔gamma radiation has a shorter wavelength than visible light, therefore making it -
✔✔more penetrating
✔✔a radiation area is defined as "an area accessible to individuals, in which they could
receive..." - ✔✔5 mR/h
✔✔a high radiation area is defined as "an area accessible to individuals, in which they
could receive..." - ✔✔100 mR/h
✔✔a member of the public or unmonitored individual is allowed to receive up to, but not
to exceed - ✔✔2 mR/h, 100 mR/year
✔✔when performing radiography in the field, regulations require the radiographer to
post with physical barriers or signs the - ✔✔high radiation area and radiation area
✔✔to which access is restricted for the purpose of controlling radiation exposure -
✔✔restricted area
✔✔a radiographer and assistant are standing in a 2mR/h field. what would the
assistant's total dose be after 4 h? - ✔✔8.0 mR
✔✔a radiographer is receiving 100 mR/h at the crank assembly. the crank assembly is
25ft in length. how long will it take for the radiographer to receive a total dose of 50 mR -
✔✔30 minutes
QUESTIONS WITH ANSWERS GRADED A+
✔✔the fact that gasses bombarded by ionizing radiation become conductors of
electrical current make them useful in - ✔✔detection equipment
✔✔a dosimeter must be capable of reading a range of - ✔✔0-200 mR (0-2mSv)
✔✔pocket ion chambers must be capable of reading - ✔✔200 mR (2mSv)
✔✔an exposure rate is measured by - ✔✔survey meter
✔✔what dosimeters (dosimetric devices) are last affected by moisture - ✔✔TLDs
✔✔full deflection of a survey meter while on batter check means - ✔✔meter may or may
not be working properly
✔✔dosimeters must be calibrated at intervals not to exceed - ✔✔annually
✔✔rate alarms must be calibrated at intervals not to exceed - ✔✔yearly
✔✔a film badge/TLD records what - ✔✔total dose history for the period worn
✔✔when performing radiography in a permanent radiographic installation equipped with
an area monitor, the technician is not required to - ✔✔wear a rate alarm
✔✔a direct reading ionization chamber, such as a dosimeter, has the advantage of
providing an - ✔✔immediate dose history since last time charged
✔✔a radiographers survey meter is sowing 0 near the source; it can safely be assumed
that: - ✔✔the meter is in an inoperable state, the radiographer should retreat from the
source until an operational meter has replaced the suspect meter
✔✔a radiographer reads 7.5 on the 10x scale of the survey meter. what is the current
dose rate at that position - ✔✔75 mR/h
✔✔after 6 half-value layers, what percentage of radiation would be received - ✔✔1.6%
✔✔assuming a source has a half-life of 20 years, how old would the source be in 3 half-
lives - ✔✔60 years
✔✔if a radiographer has 60 mR (0.6 mSv) at the surface of the exposure device, what
would the reading be after 2 half lives - ✔✔15mR
, ✔✔a sealed source emits what - ✔✔gamma rays
✔✔the ball on a source assembly that prevents the source from exiting through the
back of the camera is called - ✔✔safety stop ball
✔✔emission of gamma rays, alpha rays and beta rays is considered what -
✔✔characteristics of source decay
✔✔to penetrate a thicker or denser material, you would need a source with - ✔✔more
energy (shorter wavelength)
✔✔an element's weight is the - ✔✔A number
✔✔an element is identified by the number of _________ in its nucleus - ✔✔protons
✔✔the first indication of an extremity radiation overexposure is - ✔✔reddening of the
skin
✔✔gamma radiation has a shorter wavelength than visible light, therefore making it -
✔✔more penetrating
✔✔a radiation area is defined as "an area accessible to individuals, in which they could
receive..." - ✔✔5 mR/h
✔✔a high radiation area is defined as "an area accessible to individuals, in which they
could receive..." - ✔✔100 mR/h
✔✔a member of the public or unmonitored individual is allowed to receive up to, but not
to exceed - ✔✔2 mR/h, 100 mR/year
✔✔when performing radiography in the field, regulations require the radiographer to
post with physical barriers or signs the - ✔✔high radiation area and radiation area
✔✔to which access is restricted for the purpose of controlling radiation exposure -
✔✔restricted area
✔✔a radiographer and assistant are standing in a 2mR/h field. what would the
assistant's total dose be after 4 h? - ✔✔8.0 mR
✔✔a radiographer is receiving 100 mR/h at the crank assembly. the crank assembly is
25ft in length. how long will it take for the radiographer to receive a total dose of 50 mR -
✔✔30 minutes
