CAJ | 학술논문

目的研究用热释光剂量计(TLD)方法核查放射治疗参考条件和非参考条件下剂量学参数的可靠性验证.方法在参考条件和非参考条件下,用建立的TLD方法,核查10条6 MV光子线束剂量随照射野大小和45°楔形板等变化,4条9 MeV电子线束轴向最大剂量点处等剂量学参数,TLD估算结果与剂量仪测量结果进行对比.结果 6 MV光子线束TLD估算结果与指形电离室测量结果的平均相对偏差为4.7％,按照IAEA要求允许偏差不超过±7％;9 MeV电子线束TLD估算结果与平行板电离室测量结果平均相对偏差为2.4％,均未超过IAEA允许偏差要求(±5％).结论用TLD核查参考条件和非参考条件下放射治疗剂量学参数方法可靠,简单易行.
목적 연구용열석광제량계(TLD)방법핵사방사치료삼고조건화비삼고조건하제량학삼수적가고성험증.방법 재삼고조건화비삼고조건하,용건립적TLD방법,핵사10조6 MV광자선속제량수조사야대소화45°설형판등변화,4조9 MeV전자선속축향최대제량점처등제량학삼수,TLD고산결과여제량의측량결과진행대비.결과 6 MV광자선속TLD고산결과여지형전리실측량결과적평균상대편차위4.7％,안조IAEA요구윤허편차불초과±7％;9 MeV전자선속TLD고산결과여평행판전리실측량결과평균상대편차위2.4％,균미초과IAEA윤허편차요구(±5％).결론 용TLD핵사삼고조건화비삼고조건하방사치료제량학삼수방법가고,간단역행.
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.