Observatory for Geodynamic of the East Yangtze Block in Jiujiang, Jiujiang 332006, China; Jiangxi Earthquake Agency, Nanchang 330000, China.
CEA Key Laboratory of Earthquake Forecasting, Institute of Earthquake Science, China Earthquake Administration, Beijing 100036, China.
J Environ Radioact. 2024 Dec;280:107546. doi: 10.1016/j.jenvrad.2024.107546. Epub 2024 Sep 25.
As an emerging method for seismic precursory signals in underground fluid, the reliability and stability of in-situ online monitoring devices for soil radon are crucial performance indicators that are directly related to the successful implementation of continuous monitoring of soil radon in seismic areas. This study conducted laboratory testing and field applications of a new in-situ online monitoring instrument for seismic soil radon, utilizing the experimental testing conditions provided by the radon monitoring instrument detection platform of the China Earthquake Administration and the natural experimental site at Xianshuihe Fault Zone in the China Seismic Experimental Site. The results indicate that laboratory measurement repeatability of the instrument is 5.53%, the relative intrinsic error of radon volume response activity is 1.53%, and the response capability of hourly sampling at high radon volume response activity (greater than 1.0 × 10 Bq/m) lags behind the standard instrument by 2 h, essentially meeting the requirements for seismic observation. Under field conditions, the instruments exhibit good synchronization in response at different depths at the same location. However, further improvements are needed to enhance the consistency of long-term operation in the field, as well as the adaptability to outdoor self-powering, data transmission, and environmental conditions.
作为地下流体地震前兆信号的一种新兴方法，土壤氡原位在线监测设备的可靠性和稳定性是关键性能指标，直接关系到地震区土壤氡连续监测的成功实施。本研究利用中国地震局氡监测仪检测平台和中国地震实验场仙水河断裂带天然实验场提供的实验测试条件，对一种新型的地震土壤氡原位在线监测仪器进行了实验室测试和现场应用。结果表明，仪器的实验室测量重复性为 5.53%，氡体积响应活度的相对固有误差为 1.53%，高氡体积响应活度（大于 1.0×10 Bq/m）下的小时采样响应能力滞后标准仪器 2 小时，基本满足地震观测要求。在现场条件下，同一地点不同深度的仪器响应具有良好的同步性。然而，仍需要进一步改进，以提高野外长期运行的一致性，以及对户外自供电、数据传输和环境条件的适应性。
