Iranian Journal of Medical Physics

Iranian Journal of Medical Physics

Status and Trend of Occupational Radiation Exposure in Radiotherapy and Diagnostic X-ray Practices in Bangladesh

Document Type : Original Paper

Authors
Subrata Banik 1
Shikha Pervin 2
M.M. Mahfuz Siraz 2
A. K. M. Mizanur Rahman 2
Mohammad Sohelur Rahman 2
Selina Yeasmin 2
1 Health Physics Division, Atomic Energy Centre, Bangladesh Atomic Energy Commission, Dhaka-1000, Bangladesh
2 Health Physics Division, Atomic Energy Centre, Bangladesh Atomic Energy Commission, Dhaka 1000, Bangladesh
10.22038/ijmp.2020.51707.1850
Abstract
Introduction: The evaluation of occupational exposure and related trends due to external ionizing radiation in diagnostic and therapeutic purposes has become crucial to understanding the implementation of regulatory acts and technological advancement. This study describes the status of occupational radiation exposure in the radiotherapy (RT) and diagnostic X-ray (DR) sector and the comparison with related research.
Material and Methods: Overall, 12141 radiation workers were monitored using thermoluminescent dosimeters (TLDs) read-out by Harshaw TLD Reader (Model 4500) on a quarterly basis. Several parameters such as annual collective effective dose, average annual effective dose, collective and individual dose distribution, and the probability of cancer risk were analyzed.
Results: The number of monitored workers increased by around 35%, whereas the number of radiation workers who received a measurable amount of doses decreased by around 37% during 2014-2018. The annual average effective doses in RT and DR were in the range of 0.017-0.1112 and 0.076-0.1702 mSv, respectively. The results indicate that more than 94% of the total collective dose was for the non-physician group. Among exposed radiation workers, almost 78% received doses below 1mSv and <1% received doses over 15mSv. The annual average effective dose is five times lower than the worldwide average value. Depending on the average occupational dose, the expected number of radiation-induced cancer cases among the monitored workers is below 1.
Conclusion: Dose distribution tends to move towards lower levels and reveals that the majority of the organizations maintain adequate radiation protection.
Keywords
Occupational Exposure Radiation
Ionizing Thermoluminescent Dosimetry
Radiation Protection
Subjects

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Iranian Journal of Medical Physics
Volume 18, Issue 6
November and December 2021
Pages 389-396

  • Receive Date 07 September 2020
  • Revise Date 22 October 2020
  • Accept Date 26 October 2020