Search published articles


Showing 2 results for Ionizing Radiation
Assessment of Environmental Gamma Radiation Dose Rate in Ardabil and Sarein in 2009
S Hazrati, M Barak, M Alighadri,
Volume 4, Issue 3 (10-2011)
Abstract

Background and Objectives: Gamma rays, the most energetic photons within the any other wave in the electromagnetic spectrum, pose enough energy to form charged particles and adversely affect human health. Provided that the external exposure of human beings to natural environmental gamma radiation normally exceeds that from all man-made sources combined, environmental gamma dose rate and corresponding annual effective dose were determined in the cities of Ardabil and Sar Ein.
Materials and Methods: Outdoor environmental gamma dose rates were measured using an Ion Chamber Survey Meter in 48 selected locations (one in city center and the remaining in cardinal and ordinal directions) in Ardabil and Sar Ein. Ten more locations were monitored along the hot springs effluent in Sar Ein. Measurements of gamma radiation dose rate were performed at 20 and 100 cm above the ground for a period of one hour.
Results: Average outdoor environmental gamma dose rate were determined as 265, 219, and 208  for Ardabil, Sar Ein, and along the hot spring effluent, respectively. The annual affective dose for Ardabil and Sar Ein residents were estimated to be 1.45 and 1.39 mSv, respectively.
Conclusion: Calculated annual effective dose of 1.49 and 1.35 are appreciably higher than the population weighted average exposure to environmental gamma radiation worldwide and that analysis of soil content to different radionuclide is suggested.


Assessment and evaluation of leakage ionizing dose from radiation medicine centers of Qazvin province
Akram Samieifard, Akram Bahojb Moqanian, Mehdi Ranjbaran, Hamid Karyab,
Volume 18, Issue 4 (3-2026)
Abstract
Background and Objective: Measuring leakage radiation dose in radiology centers is essential for protecting public health. This study aimed to assess the exposure levels of radiation workers (in controlled areas) and visitors (in supervised areas) to ionizing radiation in radiology centers of Qazvin Province.
Materials and Methods: This descriptive cross-sectional study was conducted as a census in 79 radiology centers across Qazvin Province. Leakage dose was measured using a FLUKE 451B ionization chamber and reported in μSv/h. Using the U.S. Radiological Protection Commission model, exposure in controlled and supervised areas was estimated in mSv/year. Finally, Monte Carlo simulation was applied to analyze the probabilistic distribution of exposure for workers and visitors.
Results: The mean leakage dose in controlled and supervised areas was 0.1–1.7 μSv/h and 0.1–2.19 μSv/h, respectively. The mean exposure dose for radiation workers and visitors was estimated at 0.1755± 0.3079 mSv/year and 6.2 ±14.9×10⁻⁵ mSv/year, respectively, which showed a statistically significant difference (p< 0.0001). Based on Monte Carlo simulation results, 93 percent of exposure for workers fell within 0.0–0.98 mSv/year, and 95% of exposure for visitors fell within 0.0–0.01 mSv/year.
Conclusion: The findings indicate that leakage doses in radiology centers of Qazvin Province are within permissible limits. However, the detection of elevated ionizing radiation leakage in CT angiography and nuclear medicine departments underscores the need for continuous monitoring and adherence to the ALARA principle. Although the study has a cross-sectional design, its results may serve as a basis for developing national radiation safety policies.
 

Page 1 from 1     

© 2026 , Tehran University of Medical Sciences, CC BY-NC 4.0

Designed & Developed by: Yektaweb