The Estimation of Radiation Effective Dose from Diagnostic Medical Procedures in GeneralPopulation of Northern Iran

Background/ The risks of low-dose ionizing radiation from radiology and nuclear medicine are not clearly determined. Effective dose to population is a very important factor in risk estimation. The study aimed to determine the effective dose from diagnostic radiation medi-cine in a northern province of Iran. Data about various radiologic and nuclear medicine procedures were collected from all radiology and nuclear medicine departments in Mazandaran Province (popu-lation = 2,898,031); and using the standard dosimetry tables, the total dose, dose per examination, and annual effective dose per capita as well as the annual gonadal dose per ca-pita were estimated. 655,730 radiologic examinations in a year’s period, lead to 1.45 mSv, 0.33 mSv and 0.31 mGy as average effective dose per examination, annual average effective dose to member of the public, and annual average gonadal dose per capita, respectively. The frequency of medical radiologic examinations was 2,262 examinations annually per 10,000 members of population. However, the total number of nuclear medicine examinations in the same period was 7074, with 4.37 mSv, 9.6 Sv and 9.8 Gy, as average effective dose per examination, an-nual average effective dose to member of the public and annual average gonadal dose per caput, respectively. The frequency of nuclear medicine examination was 24 examinations annu-ally per 10,000 members of population. The average effective dose per examination was nearly similar to other studies. However, the average annual effective dose and annual average gonadal dose per capita were less than the similar values in other reports, which could be due to lesser number of radiation medicine examinations in the present study.