A new calibration method for radon detector in seismic systems  

作　　者：Hongwei Ren Yaowei Liu 

机构地区：[1]Institute of Geophysics,China Earthquake Administration,Beijing 100081,China [2]National Institute of Natural Hazards,Ministry of Emergency Management,Beijing 100085,China

出　　处：《Earthquake Science》2024年第5期445-458,共14页地震学报（英文版）

基　　金：supported by the National Natural Science Foundation of China Study on the Key Technology of Non-radium Source Radon Chamber(No.42274235).

摘　　要：Radon observation is an important measurement item of seismic precursor network observation.The radon detector calibration is a key technical link for ensuring radon observation accuracy.At present,the radon detector calibration in seismic systems in China is faced with a series of bottleneck problems,such as aging and scrap,acquisition difficulties,high supervision costs,and transportation limitations of radon sources.As a result,a large number of radon detectors cannot be accurately calibrated regularly,seriously affecting the accuracy and reliability of radon observation data in China.To solve this problem,a new calibration method for radon detectors was established.The advantage of this method is that the dangerous radioactive substance,i.e.,the radon source,can be avoided,but only“standard instruments”and water samples with certain dissolved radon concentrations can be used to realize radon detector calibration.This method avoids the risk of radioactive leakage and solves the current widespread difficulties and bottleneck of radon detector calibration in seismic systems in China.The comparison experiment with the traditional calibration method shows that the error of the calibration coefficient obtained by the new method is less than 5%compared with that by the traditional method,which meets the requirements of seismic observation systems,confirming the reliability of the new method.This new method can completely replace the traditional calibration method of using a radon source in seismic systems.

关 键 词：radon detector CALIBRATION “standard instrument” scintillation chamber radon source 

分 类 号：P315.62[天文地球—地震学]