At which dose of radiation have gonadal responses been observed?

Gonadal responses to radiation primarily involve the effects on reproductive organs and can include changes in hormone production, fertility, and the health of gametes. Research indicates that observable gonadal responses can occur at doses as low as 0.1 Gy. This threshold is significant because it reflects the sensitivity of the reproductive system to ionizing radiation, highlighting that even relatively low doses can lead to measurable biological effects.

In contrast, the other options represent doses that are higher than this threshold, where gonadal responses may not be as easily observed or may not consistently manifest. While higher doses certainly can trigger reactions, the focus on the lowest effective dose emphasizes the inherent vulnerability of the gonads to dose-effective radiation exposure. Understanding this range is crucial for assessing risk and establishing safety protocols in medical and occupational settings involving radiation exposure.