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Radiation Biophysics || Questions and 100% Accurate Answers.
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  • Radiation Biophysics
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  • Radiation Biophysics

ICRP correct answers International Commission on Radiological Protection UNSCEAR correct answers United Nations Scientific Committee on the Effects of Atomic Radiation BEIR correct answers Biological Effects of Ionizing Radiation NRC correct answers Nuclear Regulatory Commission 1 corre...

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  • December 15, 2024
  • 15
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • icrp

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  • Radiation Biophysics
  • Radiation Biophysics

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Radiation Biophysics || Questions and 100% Accurate
Answers.
ICRP correct answers International Commission on Radiological Protection

UNSCEAR correct answers United Nations Scientific Committee on the Effects of Atomic
Radiation

BEIR correct answers Biological Effects of Ionizing Radiation

NRC correct answers Nuclear Regulatory Commission

1 correct answers photon radiation weighting factor

1 correct answers electron and muon radiation weighting factor

2 correct answers proton and charged pion radiation weighting factor

20 correct answers alpha particle, fission fragment, heavy ion radiation weighting factor

Continuous curve as function of neutron energy correct answers neutron radiation weighting
factor

equivalent dose correct answers Product of absorbed dose averaged over a tissue or organ and
the radiation weighting factor

absorbed dose x W_R

Unit: Sieverts

No correct answers 1 Sievert of neutrons produces the same biological effect as 1 Sievert of X-
rays. Is this true for Gray?

effective dose correct answers equivalent dose x W_T (absorbed dose x W_R x W_T)

Sievert

committed equivalent dose correct answers Integral over the time T of the equivalent dose in a
given tissue after intake of a radionuclide (T = 50 adults, 70 children)

committed effective dose correct answers committed equivalent doses to individual organs
multiplied by tissue weighting factor and reintegrated

collective equivalent dose correct answers population-level analogue of committed equivalent
dose (person Sieverts)

, collective effective dose correct answers population-level analogue of committed effective dose

product of the average effective dose and the number of individuals exposed (Person-sievert)

collective committed effective dose correct answers apply 50 year integral to collective effective
dose

Integration of the ecollective dose over 50 y (Person-sievert)

absorbed dose correct answers energy per unit mass (Gray)

equivalent dose correct answers average dose x radiation weighting factor (Sievert)

effective dose correct answers sum of equivalent doses to organs and tissues exposed, each
multiplied by the appropriate weighting factor (Sievert)

cell kill correct answers type of tissue damage that occurs to skin, is deterministic

cell mutation correct answers type of tissue damage that can cause cancer, stochastic

deterministic versus stochastic effect of radiation correct answers

as low as reasonably achievable (ALARA) correct answers if dose can be lower, make it lower

ICRP Recommendations correct answers - diagnostic or therapeutic benefit must outweigh risk
of exposure
- occupational: risk must be assessed along with other sources of risk
- research: benefit is unknown to individual, but benefit to society must outweigh individual risks

40%/Sv correct answers risk estimate of severe intellectual impairment associated with exposure
of embryo/fetus (8-15 wk)

5%/Sv correct answers risk estimate of carcinogenesis of general population (low dose, low dose
rate)

0.2%/Sv correct answers risk estimate of heritable effects for the general population

based on skin erythema correct answers earliest exposure limit (1930s)

late effects correct answers 1950s exposure limit based on animal studies

comparison of chance of carcinogenesis to occupational mortality correct answers 1980s
exposure limit from the NCRP

0.5 mSv/month correct answers NCRP recommended dose limit after pregnancy declared

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