| Wang Jin,Yu Ningle,Yang Chunyong,Du Xiang,Chen Wei,Luo Suming.Dosimetric verification for radiotherapy quality audit under reference and non-reference conditions in Jiangsu province[J].Chinese Journal of Radiological Medicine and Protection,2014,34(6):451-455 |
| Dosimetric verification for radiotherapy quality audit under reference and non-reference conditions in Jiangsu province |
| Received:November 07, 2013 |
| DOI：10.3760/cma.j.issn.0254-5098.2014.06.014 |
| KeyWords:Thermoluminescent dosimeter Reference and non-reference conditions Finger ionization chamber Plane parallel ionization chamber Radiotherapy dose |
| FundProject:IAEA基金资助项目（11916/R0）；卫生行业科研专项（201002009）；江苏省“十二·五”科教兴卫工程（ZX201109）；江苏省特种医学重点学科基金；江苏省卫生厅预防医学科研基金（Y2012088） |
| Author Name | Affiliation | E-mail | | Wang Jin | Jiangsu Provincial Center for Disease Prevention and Control, Nanjing 210009, China | | | Yu Ningle | Jiangsu Provincial Center for Disease Prevention and Control, Nanjing 210009, China | yuningle@163.com | | Yang Chunyong | Jiangsu Provincial Center for Disease Prevention and Control, Nanjing 210009, China | | | Du Xiang | Jiangsu Provincial Center for Disease Prevention and Control, Nanjing 210009, China | | | Chen Wei | Jiangsu Provincial Center for Disease Prevention and Control, Nanjing 210009, China | | | Luo Suming | 中国疾病预防控制中心辐射防护与核安全医学所 辐射防护与核应急中国疾病预防控制中心重点实验室 | |
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| Abstract:: |
| Objective To verify the methodology for auditing dosimetric parameters in reference and non-reference conditions with thermoluminescent dosimeters (TLDs). Methods Under reference and non-reference conditions, the established TLD methods were used to observe the absorbed dose variations with depth, SSD, field size and 45 wedges for 10 photon beams at 5 hospitals. Dosimetric parameters, including doses at Dmax points in axis, on 5 electron beams of 9 MeV were measured. The measurement results were compared between the TLDs and plane parallel ionization chambers. Results For 6 MV photon beams, the relative deviation of between finger ionization chamber method and TLD chips was in the range of -1.7% to 5.4% under on-axis non-reference conditions, and -6.3% to -0.6% under off-axis non-reference conditions, respectively, all within the range of ≤±7% as required by the IAEA. The relative deviation between plane parallel chamber and TLD method was -2.3% to 3.7%, within ±5% as required by the IAEA. Conclusions It is convenient and feasible to use TLD method for quality audits of dosimetric parameters in radiotherapy. |
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