Radiation- Safety Exam Questions and
All Correct Answers.
Terrestrial 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 - Answer Additional guidelines of NCRP
As low as reasonably achievable - Answer ALARA acronym
Maintain radiation doses to personnel in medical institutions to 10% or less of the federal limits
of occupational exposure - Answer ALARA implementation
Personnel Dosimeters - Answer devices worn by individuals exposed to ionizing radiation to
evaluate and document their cumulative external radiation doses
Body Dosimeters - Answer utilize "optically stimulated luminescence (OSL)". Called "Luxel"
dosimeters. Very sensitive to ionizing radiation.
Ring Dosimeters - Answer are "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 - Answer three doses the luxel body dosimeter can report
Shallow dose - Answer dose equivalent computed for a tissue depth of 0.007 cm (skin dose)
Deep dose - Answer dose equivalent computed for a tissue depth of 1.0 cm
Lens dose - Answer dose 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 - Answer Three types of portable survey instruments
All Correct Answers.
Terrestrial 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 - Answer Additional guidelines of NCRP
As low as reasonably achievable - Answer ALARA acronym
Maintain radiation doses to personnel in medical institutions to 10% or less of the federal limits
of occupational exposure - Answer ALARA implementation
Personnel Dosimeters - Answer devices worn by individuals exposed to ionizing radiation to
evaluate and document their cumulative external radiation doses
Body Dosimeters - Answer utilize "optically stimulated luminescence (OSL)". Called "Luxel"
dosimeters. Very sensitive to ionizing radiation.
Ring Dosimeters - Answer are "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 - Answer three doses the luxel body dosimeter can report
Shallow dose - Answer dose equivalent computed for a tissue depth of 0.007 cm (skin dose)
Deep dose - Answer dose equivalent computed for a tissue depth of 1.0 cm
Lens dose - Answer dose 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 - Answer Three types of portable survey instruments
