Exploration on Calibration of BG2015R Radon Meter by AlphaGUARD Radon Meter
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摘要: 氡对地震前后地层应力变化反应较为敏感,是示踪构造与地震活动的一种有效的化学元素。氡观测在我国地震前兆流体观测手段中占很大权重,但由于近年来仪器老化及更新换代较多,许多台站测氡仪的标定工作受到制约,因而影响了氡观测资料的准确性和可靠性。本文利用高精度的AlphaGUARD测氡仪,分别采用含有一定浓度的新鲜井水、固定源对宁德一号井BG2015R测氡仪进行标定实验,其结果的新K值与旧K值相对误差分别为2.83%、1.1%,标定结果符合中国地震台网的观测要求;同时对标定实验中AlphaGUARD测氡仪、BG2015R测氡仪测值进行了均值、一致性等指标计算分析,给出了对两套仪器标定时的取值建议。文中所述的标定实验的流程和方法可以为在网运行测氡仪的标定提供一定的技术参考。Abstract: Radon is sensitive to the change of strata stress before and after the earthquake. It is an effective element for tracing the structure and seismic activity, and accounts for a large proportion in China's earthquake precursor observation network. In recent years, due to the aging and updating of instruments, the calibration of radon meters at many stations has been restricted, which further affects the accuracy and reliability of radon observation data. In this paper, the high-precision AlphaGUARD radon meter is used to calibrate the BG2015R radon meter in Ningde No.1 Well by using fresh well water and fixed sources with a certain concentration. The relative errors between the new K value and the old K value are 2.83% and 1.1% respectively, and the calibration results meet the observation requirements of China Earthquake Networks Center; At the same time, the average and consistency of the measured values of AlphaGUARD radon meter and BG2015R radon meter in the calibration experiment are calculated and analyzed, and the value suggestions for the calibration of the two sets of instruments are given. The flow and method of the calibration experiment described in this paper can provide a certain technical reference for the calibration of the radon meter operating in the network.
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Key words:
- Radon measurement instrument /
- calibration /
- consistency
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表 1 测氡仪实验数据结果分析
Table 1. Analysis of experimental data of radon meters
测氡仪型号 实验组次 均值(Bq/L) 误差(Bq/L) 一致性结果 (7—12) (5—20) (7—12) (5—20) P2000 实验1-1 211.33 209.94 5.20 5.38 0.47% 实验1-2 168.33 167.00 4.27 3.93 0.56% 实验1-3 69.30 69.41 1.70 2.11 0.11% 实验2-1 142.83 143.38 4.40 4.30 0.27% 实验2-2 139.50 138.19 4.32 4.81 0.67% 实验2-3 139.33 137.19 3.01 5.60 1.10% BG2015R 实验1-1 4841.38 4608.15 83.84 81.82 2.55% 实验1-2 3563.73 3513.41 72.52 68.43 0.73% 实验1-3 1601.77 1644.72 38.44 33.97 1.35% 实验2-1 3521.27 3915.70 171.23 11.99 5.46% 实验2-2 3695.47 3896.75 136.34 27.68 2.73% 实验2-3 3618.20 3858.08 105.34 40.31 3.34% 表 2 标定K值表(单位:cpm•m3•Bq−1)
Table 2. Scale K value table (unit: cpm•m3•Bq−1)
参数及单位 校正后测值
CRn(Bq/L)计数率
N(cpm)标定K值 K值
平均值K值
相对误差/%新K值 旧K值 新—旧K值
相对误差/%实验1
(1号闪烁室)211.33 4625 0.02189 0.02217 −1.26 0.02217 0.0274 −19.1 168.33 3491 0.02074 −6.45 69.30 1565 0.02258 1.85 实验2
(1号闪烁室)142.78 3916 0.02742 0.02769 −0.97 0.02769 0.0274 1.1 139.45 3897 0.02794 0.91 139.23 3858 0.02771 0.06 实验3
(2号闪烁室)112.42 2720 0.02419 0.02387 1.34 0.02387 0.0241 −0.9 115.90 2732 0.02357 −1.26 111.57 2661 0.02385 −0.08 实验4
(4号闪烁室)116.75 7420 0.0635 0.06350 0.0 0.06350 0.0766 −17.10 118.72 7453 0.0628 −0.11 119.64 7682 0.0642 0.11 实验5
(4号闪烁室)124.67 9829 0.0788 0.07877 0.04 0.07877 0.0766 2.83 121.50 9552 0.0786 −0.21 122.67 9682 0.0789 0.17 -
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