AlphaGUARD与FD-125测氡仪的对比观测研究

Comparison between AlphaGUARD and FD-125 Radon detectors

本文用AlphaGUARD测氡仪进行真空状态下静置时间与氡浓度关系的实验,以总结AlphaGUARD测氡仪测试氡值的最佳稳定时间段及氡值变化是否符合氡衰变规律;通过对平行样品的观测,分析了AlphaGUARD测氡仪与FD-125测氡仪的一致性问题。结果表明,在静置时间70min以内,氡值变化比较稳定,70min之后氡观测值逐渐降低,基本符合氡放射性衰变规律:AlphaGUARD测氡仪与FD-125测氡仪结果具有一定偏差,平均相对偏差小于约10%。据推测可能是两个仪器的系统测试误差造成的,另外FD-125测氡仪自身存在校准氡源活度与样品浓度差距过大而导致测试结果偏离等缺点。以上实验结果为AlphaGUARD测氡仪在地震系统的推广应用积累了经验。

In this paper, we study the relationship of the static periods and the concentration of radon by AlphaGUARD radon instrument under the state of vacuum. We found that the static periods and the radon concentrations range measured with the AlphaGUARD radon instrument is in accordance with the law of decay. The best stability time and the variation of the radon measurement were determined by AlphaGUARD and FD-125. The results show that the variation of radon values is relatively stable in the static time of 70min and the radon observation value is gradually decreased, which conform to the decay law of radon. The average relative deviation of the measured values by the two instruments is less than 10%, which may due to the system error of the two instruments and the inaccurate of FD-125 test. The results of these experiments are helpful for the application of AlphaGUARD in the earthquake research in future.