International journal of Advanced Biological and Biomedical Research، جلد ۳، شماره ۱، صفحات ۹۷-۱۰۴
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عنوان انگلیسی The Effect of Field Size and Distance from the Field Center on Neutron Contamination in Medical Linear Accelerator
چکیده انگلیسی مقاله Objective: Using Megavoltage photons generated by medical linear accelerator is a common modality for the treatment of malignant. The crucial problem for using photon beams >8MV is the photoneutron yields that increase the risk of secondary cancer that treated with high-energy photon beams. The contaminated neutrons produced in different components of the accelerator head and rely on many parameters. The purpose of this study was to determine the effect of field size on the neutron dose equivalent in center and far from it at the Elekta Sl 75/25 18 MV linear accelerator. Methods: Neutron dosimetry was carried out with CR-39 films with using of chemical etching technique. The measurement was done at isocenter, 25 cm and 50 cm far from it at 100 cm SSD for squared field with 5 up to 30 cm side. Results: The results revealed that the neutron dose equivalent increased with increasing field sizes especially for 5*5 cm2 field size. It was decreased with increasing distance from the isocenter.Conclusion:The effect of field size on neutron contamination depend on amount of field aperture where in small field size 5×5 cm2 less variation need for significant change but for larger field size 10×10 cm2 this variation must be larger. The contaminated neutron outside photon field is independent of field size.
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نویسندگان مقاله مهدی جهانگیری |
department of medical physics, semnan university of medical sciences, semnan, iran
سازمان اصلی تایید شده: دانشگاه علوم پزشکی سمنان (Semnan university of medical sciences)

پیمان حجازی |
department of medical physics, semnan university of medical sciences, semnan, iran
سازمان اصلی تایید شده: دانشگاه علوم پزشکی سمنان (Semnan university of medical sciences)

سید مهدی هاشمی | seyed mehdi
second standard dosimetry laboratory, karaj institute of nuclear science and technology, karaj, iran

عباس حق پرست |
department of medical physics, kermanshah university of medical sciences, kermanshah, iran
سازمان اصلی تایید شده: دانشگاه علوم پزشکی کرمانشاه (Kermanshah university of medical sciences)

بردیا حاجی زاده |
medical radiation physics calibration laboratory of nrpd–atomic energy organization of iran
سازمان اصلی تایید شده: سازمان انرژی اتمی (Atomic energy organization)

نشانی اینترنتی http://www.ijabbr.com/article_12651_9bd8d6ce44c8bdc393682a81f30874b9.pdf
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زبان مقاله منتشر شده en
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