Is there any occupational hazard in radiotherapy and nuclearmedicine?

Several, but well...: Understood. First there is radiation exposure in nuclear medicine, from the medicines injected into the patients, and then the patients themselves. There should not be significant occupational exposure to radiation with radiation therapy. In some areas, nm technologists inject patients, so there is risk of needles and blood exposure. The rest is health care job related - moving patients, etc.

Not really: Nuclear medicine staff are very heavily monitored that they dont exceed the occupational radiation limits. This testing is regulated by the government to mitigate occupational risk for employees.

Very minimal: Occcupational hazards are minimal because radiation safety procedures in place and observed by satisfactorily trained technologists and nuclear physicians offers extreme protection.