Radiation Health and Safety Test Radiation Biology & Health Effects 3

Question 1

Which tissue is considered among the MOST radiosensitive in the human body?

Accepted Answer

Bone marrow (red)

Answer

Nerve tissue

Answer

Muscle tissue

Answer

Mature bone cortex

Question 2

Radiation-induced hereditary (genetic) effects refer to mutations that occur in:

Accepted Answer

Germ cells that can be passed to future generations

Answer

Somatic cells of the exposed individual

Answer

Only brain cells, which are radio-resistant

Answer

Liver cells involved in drug metabolism

Question 3

The latent period for radiation-induced solid tumors is typically:

Accepted Answer

10–40 years after exposure

Answer

Days to weeks after exposure

Answer

1–5 years after exposure

Answer

Greater than 50 years only

Question 4

In utero radiation exposure during the period of major organogenesis (2–7 weeks post-conception) most likely causes:

Accepted Answer

Congenital malformations and organ defects

Answer

Increased risk of leukemia in the child

Answer

Premature aging in adulthood

Answer

Sterility in the mother

Question 5

The linear no-threshold (LNT) model assumes that:

Accepted Answer

Any dose of radiation, no matter how small, carries some risk of stochastic effects

Answer

Radiation risk only begins above 100 mSv

Answer

Low doses of radiation are beneficial (hormesis)

Answer

Risk plateaus above 1 Sv and does not increase further

Question 6

Which of the following populations provided the primary epidemiological data for radiation-induced cancer risk estimates used by regulatory agencies?

Accepted Answer

Japanese atomic bomb survivors from Hiroshima and Nagasaki

Answer

Chernobyl nuclear plant workers

Answer

Patients treated with diagnostic fluoroscopy

Answer

Uranium miners exposed to radon

Question 7

Radiation-induced skin erythema following a high acute dose to the skin is an example of which type of radiation effect?

Accepted Answer

Deterministic tissue reaction with a threshold

Answer

Stochastic carcinogenic effect

Answer

Hereditary mutation effect

Answer

Indirect probabilistic effect