Development of methodology for auditing dosimetric parameters for photon and electron beams under non-reference conditions
10.3760/cma.j.issn.0254-5098.2014.06.012
- VernacularTitle:核查放射治疗非参考条件下光子和电子线束剂量学参数方法研究
- Author:
Suming LUO
;
Zhijian HE
;
Kaibao LI
;
Xian XUE
- Publication Type:Journal Article
- Keywords:
Non-reference condition;
TLD;
Photon and electron beams;
Plane parallel chamber;
Absorbed dose
- From:
Chinese Journal of Radiological Medicine and Protection
2014;34(6):441-445
- CountryChina
- Language:Chinese
-
Abstract:
Objective To develop a methodology for auditing dosimetric parameters using TLD for photon and electron beams in non-reference conditions.Methods The correction experiments have been developed for non-linear dose response,PAAM holder,energy,fading and dispersion using TLD for 60Co γ-ray,high energy X-ray and electron beams.The measuring method was set up for absorbed dose estimation by TLDs in water.3 photon beams and 2 electron beams were selected for research purposes,and 5 photon beams and 4 electron beams for reliability research.Results The research results were evaluated for60Co source,6,10,15 and 18 MV photon beams in non-reference conditions at off-axis,with the relative deviation within-0.1％-7.2％ at-off axis (IAEA's acceptable deviation:± 7.0％).The verification results were evaluated for 5 photon beams in non-reference conditions at on-axis,with the relative deviation are within 0.1％-7.0％.The verification results were evaluated for 4 electron beams in non-reference conditions,with the relative deviation within 0-4.7％ (IAEA's acceptable deviation:±5.0％).Conclusions It is convenient and accurate to use TLD method for quality audits for clinic dosimetry parameters in radiotherapy.Two kinds of IAEA TLD holders are feasible for use in TLD audits.Absorbed doses for high energy electron beam were corrected using plane parallel chambers and verified using TLD,with good results obtained.
