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Basic and Clinical Cancer Research، جلد ۳، شماره ۳&۴، صفحات ۲۲-۲۹
عنوان فارسی
چکیده فارسی مقاله
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عنوان انگلیسی Measurement of neutron dose component in central axis absorbed dose of 18 MV photon beam by TLD600 and TLD700 dosimeters
چکیده انگلیسی مقاله Background : In spite of clinically useful photon and electron beams, high energy linacs produce secondary particles such as neutrons (photo-neutron production). Neutrons have important roles during treatment with high energy photons in terms of protection and dose escalation. In this project, neutron dose equivalent of 18 MV Varian accelerators is calculated by TLD600 and TLD700. Materials and Methods: For neutron and photon dose discrimination, first TLDs were calibrated versus definite gamma and neutron doses. Gamma calibration was done in two procedures; by standard 60 Co source and by accelerator 18 MV photon beam. For neutron calibration by 241 Am-Be source, irradiations were done in several different time intervals. Neutron dose equivalent was calculated in the central axis, on the phantom surface and depths of 1, 2, 3.3, 4, 5 and 6 cm. Results: No photo-neutron dose was achieved on the phantom surface and depths of 1, 2, 3.3 cm. The maximum photo-neutron dose equivalent was 50 mSv*Gy -1 at the depth of 5 cm. Conclusions: Photon absorbed dose calculation in central axis has an error of 5%. Neutron dose variation in different depths doesn’t show a regular procedure and in it seems to be due to the TLD inaccuracy for neutron dosimetry.
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نویسندگان مقاله هدی دارستانی | hoda darestani
radiotherapy oncology department, cancer institute, tehran university of medical sciences, tehran, i.r. iran

سازمان اصلی تایید شده: دانشگاه علوم پزشکی تهران (Tehran university of medical sciences)

حسنعلی ندایی | hassan ali nedaie
radiation oncology department, imam hussein medical center, faculty of medicine, shahid beheshti university of medical sciences, tehran, i.r. iran

سازمان اصلی تایید شده: دانشگاه علوم پزشکی شهید بهشتی (Shahid beheshti university of medical sciences)

عظیم اربابی | azim arbabi
nuclear engineering department, amirkabir industrial university, tehran, i.r. iran


خیراله محمدی | kheirollah mohammadi
radiotherapy oncology department, cancer institute, tehran university of medical sciences, tehran, i.r. iran

سازمان اصلی تایید شده: دانشگاه علوم پزشکی تهران (Tehran university of medical sciences)

محمود اله وردی | mahmood allahverdi
agricultural, medical and industrial research school, karaj, i.r. iran


ارژنگ شاهور | arjang shahvar
nuclear engineering department, science and research unit, azad university, tehran, i.r. iran


نگین شاهقلی | negin shahgholi


نشانی اینترنتی http://bccr.tums.ac.ir/index.php/bccrj/article/view/34
فایل مقاله اشکال در دسترسی به فایل - ./files/site1/rds_journals/151/article-151-433663.pdf
کد مقاله (doi)
زبان مقاله منتشر شده en
موضوعات مقاله منتشر شده
نوع مقاله منتشر شده Original Articles
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