How much does the radiation from radiotherapy affect the fetus on a patient undergoing radiotherapy?

Patient's question:

No

Doctor's answer:

Conventional radiotherapy is divided into two types: external irradiation and internal irradiation. During external irradiation radiotherapy, radiation will only reach the patient's body when the radiotherapy machine is turned on, and it will only focus on the area that needs to be irradiated. As soon as the irradiation stops, the radiation will disappear immediately, and there will be no more radiation thereafter. Therefore, there will be no radiation on the patient after radiotherapy!
During internal irradiation radiotherapy, radioactive particles are implanted into the patient's body and remain radioactive for a very long time! If it is confirmed that the radiotherapy your family member is receiving is external irradiation, it will have no effect on the fetus and there is no need to worry!