| 张震,侯长松,梁婧,等.辐射检测仪器时间常数的测量与探讨[J].中华放射医学与防护杂志,2017,37(8):609-613.Zhang Zhen,Hou Changsong,Liang Jing,et al.Measurement and discussion of circuit time constants for radiation detectors[J].Chin J Radiol Med Prot,2017,37(8):609-613 |
| 辐射检测仪器时间常数的测量与探讨 |
| Measurement and discussion of circuit time constants for radiation detectors |
| 投稿时间：2017-02-04 |
| DOI：10.3760/cma.j.issn.0254-5098.2017.08.010 |
| 中文关键词: 时间常数 周围剂量当量率 最小二乘法 不确定度 |
| 英文关键词:Circuit time constant Ambient dose equivalent rate Least square method Uncertainty |
| 基金项目:国家重大科学仪器设备开发专项（2012YQ18011806） |
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| 中文摘要: |
| 目的 测定4种常用辐射检测仪器（6150AD6+6150AD-b型剂量仪、FH40G+FHZ672E-10型剂量仪、451P型电离室剂量仪和AT1123型剂量仪）的时间常数，探讨时间响应修正公式及应用。方法 在X射线机连续出束条件下，记录仪器显示的周围剂量当量率；根据电阻R电容C串联电路（RC电路）的时间响应修正公式对数据进行最小二乘法拟合，求出仪器的时间常数τ。结果 6150AD6+6150AD-b型剂量仪2次拟合的时间常数τ相对不确定度为8%，其他类型设备2次拟合时间常数τ相对不确定度均>20%。结论 6150AD6+6150AD-b型剂量仪、451P型电离室剂量仪、FH40G+FHZ672E-10型剂量仪和AT1123型剂量仪读数稳定所需时间分别为8、5、3和2 s，其上升趋势不完全符合RC电路时间响应修正公式。 |
| 英文摘要: |
| Objective To measure the circuit time constants of 4 kinds of radiation survey meters (451P ionization chamber dosimeter, 6150AD6+6150AD-b dose meter, FH40G+FHZ672E-10 dose meter and AT1123 dose meter) and, to discuss the formula of time response correction and its application. Methods In the condition of continuous exposure of X-ray machine, the ambient dose equivalent rates shown by survey meters were recorded. In order to get the circuits time constant, the least squares fittingmethod was used to fit the data using the time response formula of circuit having a capacitance C and a resistance R in series. Results The relative uncertainty of fitted circuit time constants was higher than 20% except for 6150AD6+6150AD-b dose meter. The relative uncertainty of fitted τ was 8% for 6150AD6+6150AD-b dose meter. Conclusions The time required to stabilize the dosimeter readings was 8, 5, 3 and 2 s, respectively, for the 451P ionization chamber dosimeter, 6150AD6+6150AD-b dose meter, FH40G+FHZ672E-10 dose meter and AT1123 dose meter. The rising trend of their measured values was not fully accordance with the RC circuit time response correction formula. |
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