Exposure for medical staff from patients during/after 89Sr therapy

Abstract

89 Sr therapy patients. The Hp(10) for medical workers was measured using personal dosimeters and was found to be <1 μSv during the measurement period. Hp(0.07) for medical workers did not exceed 5 μSv per case during routine work, although the dose on the patient's skin surface was about 20 times that on the medical staff. To investigate the contribution of electrons to the measured dose, the dose on the patient's skin surface as obtained from uniformly distributed 89 Sr in a similar MIRD phantom was calculated using EGS5 code. The peak energy of the incident photons was approximately 0.6 MeV. The estimated Hp(10) and Hp(0.07) doses for the medical staff were 0.43 and 91 μSv/h, respectively. The contribution of electrons to the calculated Hp(0.07) was approximately 200 times that of photons. Thus, the high Hp(0.07) for medical staff is attributed to the strong contribution of electrons.