Simin Dadashzadeh - School of Pharmacy, Shaheed Beheshti University of Medical Sciences, Tehran, Iran
Golahmad Nasiroghli - School of Pharmacy, Shaheed Beheshti University of Medical Sciences, Tehran, Iran
Ali Sattari - Atomic Energy Organization of Iran

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 ۱۰, ۵۰ and ۱۰۰cm from ۷۰ patients who received diagnostic amounts of ²º¹Tl-chloride and ۹۹mTc-MIBI was measured. The results showed that the maximum external radiation dose rates for ²º¹Tl and ۹۹mTc were ۱۸.۴ and ۷۵.۰ μSv.h^-۱, respectively, at ۵ cm distance from the patients. The average radiation dose received by nuclear medicine technologists, considering their close contact during one working day was ۱۲.۵±۳.۴ μSv. The highest received dose was ۲۲.۷ μSv, which was well below the acceptable dose limit.