| Cheng Xiaojun,Hu Chuanpeng,Qiao Hongbing,Wei Kunjie,Luo Suming,He Zhijian.TLD-based quality audit for radiotherapy dosimetry under reference and non-reference condition in Henan province[J].Chinese Journal of Radiological Medicine and Protection,2014,34(6):446-450 |
| TLD-based quality audit for radiotherapy dosimetry under reference and non-reference condition in Henan province |
| Received:November 07, 2013 |
| DOI：10.3760/cma.j.issn.0254-5098.2014.06.013 |
| KeyWords:TLD Reference and non-reference conditions Finger ionization chamber Plane parallel ionization chamber Photon beam Electron beam |
| FundProject:IAEA基金资助项目（11916/R0）；卫生行业科研专项（201002009） |
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| Abstract:: |
| Objective To verify the reliability of radiotherapy dosimetric parameters in reference and non-reference conditions using thermoluminescent dosimeters (TLDs). Methods Using the established TLD method, the dose variations with different radiation field sizes and 45° wedge plate were verified for 10 photon beams of 6 MV, together with dosimetric parameters at the point of maximum axial dose for 4 electron beams of 9 MeV under reference and non-reference conditions. Comparisons were made between TLD results and finger ionization chamber results. Results The average relative deviation, for 6 MV photon beams, between TLD results and finger ionization chamber measurements was 4.7%, within±7% as required by the IAEA. The average relative deviation, for 9 MeV electron beam, between TLD results and plane parallel ionization chamber measurements was 2.4%, not beyond ±5% permitted by IAEA. Conclusions Using TLD method to verify the radiotherapy dosimetric parameters in reference and non-reference conditions was reliable, simple and feasible. |
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