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International Journal of Radiation Research، جلد ۱۶، شماره ۴، صفحات ۴۹۹-۵۰۳
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عنوان انگلیسی Assessment of skyshine photon dose rates from 9 and 18 MV medical linear accelerators
چکیده انگلیسی مقاله Background: Skyshine describes the radiation scattered by the atmosphere above a LINAC facility to a point on the ground. The aim of this study was to measure the skyshine photon dose rates from two different (9 MV and 18 MV) medical linear accelerators. Materials and Methods: The photon beam was directed upward (180° gantry position), with a maximum photon field size (40 × 40 cm2) at the isocenter. Measurements were obtained around the external points selected outside the room facilities at a horizontal distance from the target by the calibrated RDS-110 survey meter at four points around the isocenter. Results: The measured values of the skyshine photon exposure rates at four points for 9 MV and 18 MV were 0.6, 0.5, 0.5, and 0.4 μSv/h, and 0.6, 0.4, 0.4, and 0.5 μSv/h, respectively. All the measured skyshine photon exposure rates were lower than the values recommended by NCRP 147. Conclusion: There is a poor agreement between the measured and the calculated values; therefore it seems that caution is needed while using the equations available in NCRP 147 or 151.
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نویسندگان مقاله | N. Rostampour
Department of Medical Physics, Kermanshah University of Medical Sciences, Kermanshah, Iran


| S. Jafari
Department of Radiology, Hamadan University of Medical Sciences, Hamadan, Iran


| M. Saeb
Department of Radiation Oncology, Seyed-al-Shohada Hospital, Isfahan University of Medical Sciences, Isfahan, Iran


| M. Keshtkar
Department of Medical Physics and Radiology, Faculty of Medicine, Gonabad University of Medical Sciences, Gonabad, Iran


| P. Shokrani
Department of Medical Physics, Isfahan University of Medical Sciences, Isfahan, Iran


| P. Shokrani
Department of Medical Physics, Kermanshah University of Medical Sciences, Kermanshah, Iran
نشانی اینترنتی http://ijrr.com/browse.php?a_code=A-10-1-751&slc_lang=en&sid=1
فایل مقاله اشکال در دسترسی به فایل - ./files/site1/rds_journals/42/article-42-1167392.pdf
کد مقاله (doi)
زبان مقاله منتشر شده en
موضوعات مقاله منتشر شده Radiation Biology
نوع مقاله منتشر شده Technical Note
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