250~600 kV X射线空气比释动能量值复现方法研究
Research on Method of Reproducing Air-kerma of 250-600 kV X-ray
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摘要: 本文依托250~600 kV X射线光机，建立高能量段的重过滤窄谱X射线辐射质，研制石墨空腔电离室，通过蒙特卡罗模拟和实验测量完成250~600 kV X射线空气比释动能量值复现。在300 kV辐射质下，利用自由空气电离室和石墨空腔电离室完成X射线空气比释动能量值复现，相对标准不确定度分别为0.61%和0.45%，两种方法测量结果相对偏差为0.09%。利用研制的石墨空腔电离室在137Cs和60Co γ射线基准辐射场中完成空气比释动能的量值复现，结果与基准值的相对偏差分别为0.27%和0.39%，在不确定度范围内等效一致，验证了石墨空腔电离室测量250~600 kV X射线空气比释动能方法的可行性。Abstract: On the basis of 250-600 kV X-ray machine, the narrow spectrum series X-ray radiation qualities in the high-energy section were established, and the graphite cavity ionization chamber was developed. The 250-600 kV X-ray air-kerma was measured by Monte Carlo simulation and experiment. Under the condition of 300 kV radiation quality, the relative standard uncertainties are 0.61% and 0.45% by using free air ionization chamber and graphite cavity ionization chamber. The relative deviation between the two methods is 0.09%. The absolute measurement of air-kerma in 137Cs and 60Co γ-ray reference radiation field was completed by using the graphite cavity ionization chamber, and the relative deviations between the results and the reference value are 0.27% and 0.39%, which are equivalent within the range of uncertainty. The feasibility of measuring air-kerma of 250-600 kV X-ray by using graphite cavity ionization chamber was verified.
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Keywords:
- X-ray ,
- graphite cavity ionization chamber ,
- air-kerma ,
- uncertainty analysis
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