External radiation dose from patients received diagnostic doses of ²º¹Tl-Chloride and 99mTc-MIBI [Persian]

Abstract

Patients receiving diagnostic doses of radiopharmaceuticals become a source of contamination and exposure for those who come in contact with them, such as nuclear medicine technologists, relatives and nurses. Therefore, the measurement of external radiation dose from these patients is necessary. In this study, the dose rates at distances of 10, 50 and 100cm from 70 patients who received diagnostic amounts of ²º¹Tl-chloride and 99mTc-MIBI was measured. The results showed that the maximum external radiation dose rates for ²º¹Tl and 99mTc were 18.4 and 75.0 μSv.h^-1, respectively, at 5 cm distance from the patients. The average radiation dose received by nuclear medicine technologists, considering their close contact during one working day was 12.5±3.4 μSv. The highest received dose was 22.7 μSv, which was well below the acceptable dose limit.