Exam (elaborations)
Radiation Safety Exam Questions and Answers 2024
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Radiation Safety Exam
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Radiation Safety ExamTerrestrial radiation - answer Natural background radiation that results from the
presence of naturally occurring radioactivity in the soil and earth
Cosmic radiation - answer Natural background radiation that results from the interaction
of particles originating in outer space with the earth's atmosphere
Internal Radioactivity - answer Natural background radiation due to naturally occurring
radionuclides that have been deposited in the human body via either ingestion or
inhalation
300 millirem - answer Average annual effective dose equivalent in the US (200 millirem
attributed to radon gas)
Medical radiation - answer average per capita effective radiation dose equivalent is
approximately 53 millirem per year
Department of Transport - answer DOT
Occupational safety and Health Administration - answer OSHA
Environmental Protection Agency – answer EPA
Nuclear Regulatory Commission – answer NRC
International Commission on Radiological Protection – answer ICRP
National Council on Radiation Protection and Measurements – answer NCRP
DOT, OSHA, EPA, NRC, ICRP, NCRP - answer Agencies responsible for radiation
safety and control
5 rems per year - answer Occupational Dose Limit for effective dose equivalent
15 rems per year - answer Occupational Dose Limit for Lens of the eyes
50 rems per year - answer Occupational Dose limit for any organ or tissue
.5 rem per gestation period - answer Occupational dose limit for embryo/fetus of a
declared pregnancy
.1 rem per year - answer General Public dose limit for effective dose equivalent
, NCRP recommends that the EDE due to work-related exposure not exceed the worker's
age in years - answerAdditional guidelines of NCRP
As low as reasonably achievable - answerALARA acronym
Maintain radiation doses to personnel in medical institutions to 10% or less of the
federal limits of occupational exposure - answerALARA implementation
Personnel Dosimeters - answerdevices worn by individuals exposed to ionizing
radiation to evaluate and document their cumulative external radiation doses
Body Dosimeters - answerutilize "optically stimulated luminescence (OSL)". Called
"Luxel" dosimeters. Very sensitive to ionizing radiation.
Ring Dosimeters - answerare "thermoluminescent dosimeters (TLDs)". Used to
measure doses to the hands of certain personnel. Should be worn like a conventional
ring.
Shallow dose, deep dose, lens dose - answerthree doses the luxel body dosimeter can
report
Shallow dose - answerdose equivalent computed for a tissue depth of 0.007 cm (skin
dose)
Deep dose - answerdose equivalent computed for a tissue depth of 1.0 cm
Lens dose - answerdose equivalent computed for a tissue depth of .3 cm (thickness of
the lens of each eye)
Geiger-Muller instruments, Ionization Chamber survey instruments, Scintillation survey
instruments - answerThree types of portable survey instruments
Geiger Muller Instruments - answerutilize a gas detector that is capable of detecting
beta, gamma, and x-radiation. Uses mR/hr for gamma and x, but uses counts per
minute (cpm) for beta.
Ionization Chamber Survey Instruments - answerMeasure radiation exposure in
roentgens. CAn be used at higher exposure rate levels. Considerably more expensive
than Geiger
Scintillation Survey Instruments - answerutilize a solid sodium iodide crystal coupled to
a sensitive photomultiplier tube as a detector. Excellent at locating multiple sources or
identifying areas of contamination
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