小流量、低水头观测泉使用常规脱-集气装置，达不到观测气量的要求，会直接影响化学气体观测质量。本文以松山观测泉为研究对象，结合台站观测条件，通过技术改造和实验研究，制作了恒流溅落式脱-集气装置，对气氡观测结果进行了连续观测分析，获得了完整的年动态变化曲线。观测结果表明，该脱-集装置能够较好地解决小流量、低水头观测泉存在的流量、气量、水量不稳定的问题，使气氡观测的稳定性得到明显提高，为全国其他小流量、低水头观测泉脱-集气装置的技术改进提供了范例。

Because conventional degasser and gas collector can not meet the requirements of the observation for small flow and low water head of gas volume, the quality of the chemical gas observation is directly affected. Taking Songshan spring radon-gas an example, we combined with the observation conditions of the station, through technical transformation and experimental research, and made a constant current splash off gas gathering device. Then, we conducted continuous radon observation, and obtained a complete annual dynamic change curve. The result shows that this new device can solve the instability problems of flow, gas quantity and water quantity in small flow and low head observation springs, and improve the stability of gas radon observation significantly. Our results provide an example for the technical improvement of other small flow and low head observation springs in earthquake fluid observation stations.

P315

中国地震局“三结合”课题项目（2018SJH204）资助