Somatic effects of radiation:

Somatic effects of radiation:

• A. Are common
• B. Are caused when a large dose of high-LET radiation is received by a large area of the body
• C. Are caused after exposure to DNA
• D. Include genetic mutations

Answer: (B)

Somatic effects are the reactions observed in the irradiated person, not in future offspring. They are deterministic (have a threshold) and become more severe as dose increases. The statement that best captures these effects emphasizes that they arise when a large dose is delivered to a large body area with high linear energy transfer. High-LET radiation deposits energy densely in tissues, causing more immediate and widespread damage per unit dose, and irradiating a large volume increases the likelihood that multiple tissues are affected, producing noticeable somatic symptoms such as radiation sickness or tissue damage. The other ideas don’t fit as well: somatic effects are not typically common at diagnostic levels because those doses are far below the threshold for observable deterministic effects; while DNA damage underlies cellular injury, the defining factor highlighted here is the combination of high-LET, a large dose, and a large irradiated area; and genetic mutations refer to heritable changes in offspring, not effects seen in the irradiated person.

Somatic effects are the reactions observed in the irradiated person, not in future offspring. They are deterministic (have a threshold) and become more severe as dose increases. The statement that best captures these effects emphasizes that they arise when a large dose is delivered to a large body area with high linear energy transfer. High-LET radiation deposits energy densely in tissues, causing more immediate and widespread damage per unit dose, and irradiating a large volume increases the likelihood that multiple tissues are affected, producing noticeable somatic symptoms such as radiation sickness or tissue damage.

The other ideas don’t fit as well: somatic effects are not typically common at diagnostic levels because those doses are far below the threshold for observable deterministic effects; while DNA damage underlies cellular injury, the defining factor highlighted here is the combination of high-LET, a large dose, and a large irradiated area; and genetic mutations refer to heritable changes in offspring, not effects seen in the irradiated person.