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高能X射线下水等效材料对水的等效性研究
引用本文:王志鹏,邢书明,王坤,金孙均,范富有,刘福斌. 高能X射线下水等效材料对水的等效性研究[J]. 计量学报, 2020, 41(2): 257-262. DOI: 10.3969/j.issn.1000-1158.2020.02.22
作者姓名:王志鹏  邢书明  王坤  金孙均  范富有  刘福斌
作者单位:1.北京交通大学 机械与电子控制工程学院,北京 100044
2.中国计量科学研究院,北京 100029
摘    要:针对水等效材料校准医用加速器中存在的问题,通过对比法测量水体模和3种水等效材料校准医用加速器的剂量学差异,分别给出PTW 30013和IBA FC65-G两种类型探测器在校准深度为5 cm和10 cm的修正因子。针对加速器日稳定性校准的必要性,通过近7个月的日稳定性测量结果,给出加速器漂移量和引起漂移的可能原因;针对水等效材料在相对测量中对水的等效性,通过测量12个辐射野的输出因子,得出水等效材料在相对测量中与水一致。最后给出水等效材料在高能X射线下水吸收剂量校准时的建议和注意事项。

关 键 词:计量学  水等效材料  日稳定性  高能X射线  绝对剂量  输出因子  
收稿时间:2019-08-08

Study on the Equivalence of Water Equivalent Materials to Water under High-energy X-ray
WANG Zhi-peng,XING Shu-ming,WANG Kun,JIN Sun-jun,FAN Fu-you,LIU Fu-bin. Study on the Equivalence of Water Equivalent Materials to Water under High-energy X-ray[J]. Acta Metrologica Sinica, 2020, 41(2): 257-262. DOI: 10.3969/j.issn.1000-1158.2020.02.22
Authors:WANG Zhi-peng  XING Shu-ming  WANG Kun  JIN Sun-jun  FAN Fu-you  LIU Fu-bin
Affiliation:1. School of Mechanical Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China
2. National Institute of Metrology, Beijing 100029, China
Abstract:The problems in the calibration of accelerator using water equivalent materials were described. Three commonly used water equivalent materials were compared to water phantom in measurements of absorbed dose to water. Two Farmer-type cylindrical chamber, PTW 30013 and IBA FC65-G, were used in measurements. The calibration factors of absolute dose between water phantom and water equivalent materials at two depth, 5cm and 10cm, were listed. Through the results of daily stability nearly seven months, the necessity of daily calibration of the accelerator was explained. The dose drift of accelerator and the possible causes were given. By measuring the output factor of twelve radiation fields, the water equivalent material is consistent with water in the relative measurement. Finally, the suggestions and precautions for the water equivalent material in the calibration of high energy X-ray were given.
Keywords:metrology  water equivalent material  daily stability  high energy X-ray  absolute dose  output factor  
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