Are there radiation risks of radiopharmaceuticals?

Are there radiation risks of radiopharmaceuticals?

Because it is radioactive material, obviously there is some radiation risk, but these are very small. It has to be taken into consideration that these studies are only done or administered when there is a need for it. It is not as if everybody goes and has a nuclear medicine study. If there is a need for it, then it is justified to use a small amount of radioactivity through regular pharmaceuticals, for example for making a diagnosis or treating a patient.