@valleyfiah- Radiation exposure for nuclear medicine technologists is minimal due to very strict safety standards and precautionary measures. Nuclear techs wear special badges that track radiation exposure, ensuring that exposure is below legal limits. Essentially everything that a technologists uses is shielded from syringes to gloves.
I am not sure what the total exposure is to a nuclear technologist is during a lifetime, but I would assume it is no more than a pilot or coal miner. As for instances of cancer, studies have shown that there is increased risk of cancer and premature death associated with nuclear bomb tests, radioactive coal emissions, proximity to nuclear plants, and nuclear plant accidents. There are also studies that show a link in increased thyroid cancer and nuclear technicians. These factors make the nuclear technician profession one of the highest paid technician jobs in the country, thus also making it a competitive job market.