What is the recommended dose limit for radiation exposure after 16 weeks of conception?

The recommended dose limit for radiation exposure after 16 weeks of conception is indeed 0.5-0.7 Gy. This dose limit is based on guidelines established to protect the developing fetus from potential harm due to radiation exposure.

During pregnancy, especially after the first trimester, the fetus is more developed and sensitive to radiation. The risk of effects such as mental retardation or other developmental issues increases with higher doses of radiation. The established limit of 0.5-0.7 Gy seeks to balance the need for necessary diagnostic procedures while minimizing the risk of adverse effects on the fetus.

Regarding other ranges mentioned, the limits of 0.1-0.2 Gy and 0.2-0.3 Gy are generally considered too low to be applicable after 16 weeks of conception, which has a more established limit reflecting the increased sensitivity of the developing fetus. Meanwhile, the range of 0.7-1.0 Gy represents doses that may pose higher risks and typically exceed recommended exposure limits for pregnant patients. Therefore, the 0.5-0.7 Gy range represents a cautious approach to ensuring the safety of both the mother and the fetus.