What radiation dose to the ovaries can result in temporary infertility?

• A. 100 rad (1 Gy)
• B. 150 rad (1.5 Gy)
• C. 200 rad (2 Gy)
• D. 300 rad (3 Gy)

Answer: (C)

The threshold for temporary infertility in females due to radiation exposure is typically around 200 rad (2 Gy) to the ovaries. At this dose, radiation can damage the developing follicles and disrupt hormonal functions, leading to a temporary cessation of regular ovulatory cycles. This condition is often referred to as radiation-induced amenorrhea, where menstrual periods stop due to radiation effects on the ovaries.

Levels below this threshold, such as 100 rad (1 Gy) and 150 rad (1.5 Gy), are generally considered insufficient to cause temporary infertility, although they may still pose other risks. Therefore, the significance of 200 rad (2 Gy) is that it marks a specific point where the risk of temporary infertility becomes more pronounced, as the ovaries are particularly sensitive to radiation. Higher doses above this point, like 300 rad (3 Gy), may result in more severe effects, including permanent infertility, but the key takeaway is that 200 rad (2 Gy) is the pivotal dose associated with temporary infertility.