中国医疗设备2018，Vol.33Issue(6)：21-23,26,4.DOI:10.3969/j.issn.1674-1633.2018.06.005
6MV高能光子束水吸收剂量的计算及不确定度分析
Calculation and Uncertainty Analysis of Absorbed Dose to Water for 6 MV High Energy Photon Beam
摘要
Abstract
Based on the calculation theory of absorbed dose to water in IAEA TRS 398 report, a Primus medical linear accelerator was seclected to perform experiment. Measurement under the condition of 6 MV high-energy photons of the accelerator was conducted, and the absorbed dose to water on the basis of the observed value was calculated by using the PTW dosimeter and the three-dimensional water tank. Several key correct factors (recombination loss, polarization effect, etc.) involved in the calculation formula were analyzed and calculated. Then the absorbed dose to water of 6 MV high-energy photons was calculated, which was 100.34 cGy. Taking the influence of the measurement process and its correction into account, the mathematical model was established, the uncertainty component analysis was carried out, and the final expansion uncertainty was 2.7％. The error of the calculation results of absorbed dose to water and uncertainty were both in reasonable range, which verified the reliability of the measurement and calculation process.关键词
高能光子/水吸收剂量/修正因子/极化效应Key words
high energy photon/absorbed dose to water/correction factor/polarization effect引用本文复制引用
夏勋荣,王鹏,蒋伟,邢立腾..6MV高能光子束水吸收剂量的计算及不确定度分析[J].中国医疗设备,2018,33(6):21-23,26,4.基金项目
国家质检公益性行业科研专项(201510001). （201510001）
