Radiation Biology & Health Effects Flashcards
7 cards from real Radiation Health and Safety Test practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Radiation Biology & Health Effects flashcards as text
Which tissue is considered among the MOST radiosensitive in the human body?
Answer: Bone marrow (red)
Red bone marrow is among the most radiosensitive tissues because it contains rapidly dividing, undifferentiated hematopoietic stem cells.
Radiation-induced hereditary (genetic) effects refer to mutations that occur in:
Answer: Germ cells that can be passed to future generations
Hereditary effects result from radiation-induced mutations in sperm or egg cells (germ cells), which can be transmitted to and expressed in the offspring.
The latent period for radiation-induced solid tumors is typically:
Answer: 10–40 years after exposure
Solid tumors induced by radiation have a long latent period, typically 10–40 years, while leukemia has a shorter latency of 2–10 years.
In utero radiation exposure during the period of major organogenesis (2–7 weeks post-conception) most likely causes:
Answer: Congenital malformations and organ defects
Organogenesis is the most sensitive period for teratogenic effects; radiation during this window can cause structural malformations in forming organs.
The linear no-threshold (LNT) model assumes that:
Answer: Any dose of radiation, no matter how small, carries some risk of stochastic effects
The LNT model assumes a linear relationship between dose and cancer risk with no safe threshold, meaning even the smallest dose has a proportionate risk.
Which of the following populations provided the primary epidemiological data for radiation-induced cancer risk estimates used by regulatory agencies?
Answer: Japanese atomic bomb survivors from Hiroshima and Nagasaki
The Life Span Study of Japanese atomic bomb survivors is the primary source of data for radiation risk estimates, providing large cohort data across a range of doses.
Radiation-induced skin erythema following a high acute dose to the skin is an example of which type of radiation effect?
Answer: Deterministic tissue reaction with a threshold
Skin erythema is a deterministic effect; it requires a threshold dose (approximately 2 Gy), and severity increases as dose increases above that threshold.