Estimation of radiation dose as the result of administration of Ga-67

Recently radioisotopes and radiations have been used for various medical purposes in Japan. A series of investigations into the radiation protection measures for patients and medical workers have been carried out. The present report deals with the estimation of internal radiation doses as the result of a medical use 9 3mCi (=111MBq) of Ga-67 administered for the diagnosis of parotitis. A radiation worker whose accumulated dose over 23 years was 3.2 mGy has been regarded as the subject. Internal radiation dose, on the other hand, was estimated to be about 6 mGy for total body and 150 mGy for liver, which suggested that more effort is expected to be for minimizing radiation doses further but the problem is that medical use of radioisotopes is according to the basic philosophy developed in the recommendation of the International Commission on Radiological Protection. (author)