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International Journal of Radiation Research، جلد ۱۳، شماره ۲، صفحات ۱۹۱-۱۹۶
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عنوان انگلیسی Some steps towards establishing a tertiary standard dosimetry laboratory at a radiotherapy department
چکیده انگلیسی مقاله Background: In order to deliver the precise dose to the target in radiotherapy, absorbed dose to water at the reference point should be assessed. When the calibration procedure is performed for a reference dosimeter in the 60Co beam of a Secondary Standard Dosimetry Laboratory (SSDL), the total uncertainty in absorbed dose to water (Dw) is estimated to be approximately 1.5%. This study attempts to re-measure the ND,W factors for all available field chambers at Reza Radiotherapy & Oncology Centre (RROC). Materials and Methods: Consistency and linearity checks were performed for a range of available chambers using a check source. The ND,W factors were also measured for the ionization chambers. All cylindrical chambers have been cross calibrated at 6 MV photon beam using a Siemens Primus Plus Linac. The Plane Parallel Chamber has been cross calibrated at the highest available electron beam and the ND,W factor has been measured. Results: The tolerance of consistency and linearity checks has been reported to be within 0.3%. The ND,W value for field Farmer chamber was found in agreement with certificate within 1%. In contrast for small active volume chambers, the deviation from the SSDL reports was 2.3%. For the plane parallel chamber, the difference between SSDL and Home measurements are found to be 12%. Conclusion: Although the calibration of reference chambers used for absolute dosimetry through a Primary Standard Dosimetry Laboratory (PSDL) or SSDL is recommended, for field chambers this can be done at home department as a Tertiary Standard Dosimetry Laboratory (TSDL).
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نویسندگان مقاله s عبداللهی | s. abdollahi
reza radiotherapy oncology center, mashhad, iran


m محمدی | m. mohammadi
department of medical physics, hamadan university of medical science, hamadan, iran


a ابراهیم زاده پزشکی | a ebrahimzadeh pezeshki
reza radiotherapy oncology center, mashhad, iran


z علیزاده | z. alizadeh
reza radiotherapy oncology center, mashhad, iran
نشانی اینترنتی http://www.ijrr.com/browse.php?a_code=A-10-1-560&slc_lang=en&sid=en
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کد مقاله (doi)
زبان مقاله منتشر شده en
موضوعات مقاله منتشر شده Radiation Biology
نوع مقاله منتشر شده مرور و بررسی کلی
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