采样方式对地震监测闪烁室法测氡仪校准结果的影响研究

利用HD-6型多功能自控氡室, 配合国际标准计量仪器AlphaGUARD PQ2000Pro测氡仪, 分别采用循环采样和负压采样两种方式, 对FD-125氡钍分析器的3个闪烁室进行校准实验, 计算3个闪烁室K值和相对固有误差。 结果表明: 循环采样方式得到的闪烁室K值比负压采样方式小, 负压采样方式得到的K值偏大, 已经接近《地震水文地球化学观测技术规范》要求的闪烁室K值的极限。 循环采样得到的闪烁室相对固有误差≤5%, 达到了《地震水文地球化学观测技术规范》的要求, 而负压采样方式得到的闪烁室相对固有误差>5%, 未达到《地震水文地球化学观测技术规范》的要求; 因此, 循环采样方式更适合地震监测闪烁室法测氡仪的氡室校准。

Study on the Influence of Sampling Method on the Calibration Results of Emanometer Measured by Scintillation Chamber in Seismic Observation

Using HD-6 multi-functional automatic radon chamber and the international standard measuring instrument AlphaGUARD PQ2000Pro, cyclic sampling and negative pressure sampling were used to calibrate three scintillation chambers of the FD-125 radon and thorium analyzer. K-values and relative inherent errors of the three scintillation chambers were calculated respectively. The results show that the K-value of scintillation chamber obtained by cyclic sampling method is smaller than that obtained by negative pressure sampling method. The relative inherent error of scintillation chamber obtained by cyclic sampling is less than or equal to 5%, which meets the standard of seismic hydrogeochemistry, while the relative inherent error of scintillation chamber obtained by negative pressure sampling is large than 5%, which does not meet the standard of seismic hydrogeochemistry. The conclusion is that the method of cyclic sampling is more suitable for the calibration of radon chamber of scintillation radon meter in seismic observation.