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:: Volume 13, Issue 4 (10-2015) ::
Int J Radiat Res 2015, 13(4): 379-382 Back to browse issues page
Determination of room entry times for radiation therapists after routine 15 MV photon treatments
M. Najafi , Mohammad Reza Deevband Dr., A.A. Yousefi Diba, A. Amin Moghaddam
Shahid Beheshti University of Medical Sciences
Abstract:   (4233 Views)

Background: Radiation therapy  uses high-energy radiation to kill cancer cells. Photoneutron contamination and induced radioactivity of high energy therapeutic photon beams are considered as the main source of occupational exposure to radiation therapists who works with linear accelerators operating above 10 MV. Materials and Methods: The gamma dose rates were measured after termination of different treatment approaches using 15 MV photons and room entry times for each approach was determined. Based on the results of this study, the annual dose of radiation therapists was estimated. Results: The highest dose rate that measured in the treatment room was belonged to 3-field pelvic approach which was equal to 5 ± 1.1 µSv/h. The radiation therapist's room entry times were determined between 3 to 10 minutes and the annual dose was estimated up to 5.9 mSv/y. Conclusion: Although the estimated annual dose is less than the internationally permitted value, the undesirable dose to radiation workers could be reduced through considering recommended room entry times.

Keywords: Linear accelerator, high energy photons, radiation therapists, room entry times
Full-Text [PDF 582 kb]   (1312 Downloads)    
Type of Study: Short Report | Subject: Radiation Biology
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Najafi M, Deevband M R, Yousefi Diba A, Amin Moghaddam A. Determination of room entry times for radiation therapists after routine 15 MV photon treatments . Int J Radiat Res. 2015; 13 (4) :379-382
URL: http://ijrr.com/article-1-1595-en.html


Volume 13, Issue 4 (10-2015) Back to browse issues page
International Journal of Radiation Research
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