What is a symptom associated with a dose of 200 rad for skin exposure from radiation?

Skin erythema refers to the redness of the skin that occurs as a response to radiation exposure. This symptom is associated with a dose of approximately 200 rad, as this level of radiation can induce noticeable changes in the skin’s appearance. Erythema is caused by increased blood flow to the surface of the skin, resulting from changes in vascular permeability brought on by radiation damage to the skin cells.

At this dose level, individuals may begin to see reddening of the skin, which is usually among the first observable effects of radiation exposure. The onset and severity of erythema can vary based on individual sensitivity and the specifics of the exposure, but it is a well-documented response to this level of radiation.

Other options reflect effects that occur at different doses or are more severe; for example, epilation (hair loss) typically occurs at higher doses, while desquamation (shedding of the outer layer of skin) happens with significant doses, exceeding 1,000 rad. Permanent damage is a broader term and can result from very high levels of exposure, which leads to more severe tissue injury and possible necrosis. Thus, skin erythema is the most accurate symptom to associate with a dose of 200 rad for skin