能量鉴别式剂量计在个人剂量监测能力考核中的应用

温学新; 钱爱君

doi:10.19428/j.cnki.sjpm.2021.19983

能量鉴别式剂量计在个人剂量监测能力考核中的应用

Assessment of energy discrimination dosimeter in monitoring personal dose

摘要

摘要:
目的了解能量鉴别式剂量计的性能，并分析其对比对个人剂量监测能力考核结果的影响。
方法对CTLD-J4000型能量鉴别式剂量计进行不同能量光子照射，利用剂量计覆盖的不同密度过滤材料对光子产生不同的过滤作用，拟合读数之比随光子能量的变化曲线来鉴别光子的能量。
结果鉴别式剂量计读数无过滤/轻过滤比值与厂家参考值的重合性要好于无过滤/重过滤比值，后者在48 keV和83 keV的偏离值较高，分别为12.8%、15.5%。使用平均刻度因子带来的能量响应最大偏差为23.5%。
结论使用鉴别式剂量计能较好地鉴别出射线能量，从而减少使用平均刻度因子带来的能量响应误差。

Abstract:
ObjectiveTo evaluate the performance of energy discriminating dosimeter and compare the impact of the assessment results.
MethodsCTLD-J4000 energy discriminating dosimeter was irradiated with different energy photons, and the differences covered by the dosimeters were used. Density filtering materials have different filtering effects on photons, and the ratio curve of the readings to the photon energy was fitted to identify the photon energy.
ResultsThe coincidence between the non-filter/light filter of the CTLD-J4000 energy discrimination dosimeter and the manufacturer's reference value was better than that of the non-filter/re-filter. The latter had higher deviation values at 48 keV(12.8%)and 83 keV(15.5%), respectively. Using the average scale factor, the maximum energy response deviation was 23.5%.
ConclusionUsing a discriminating dosimeter can better identify the ray energy, thereby reducing the energy response error caused by using the average scale factor.

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