Development of high sensitivity radon detector by using of the membrane degasifier module and research for the pre-seismic phenomena.

为了提高水下氡检测仪中溶解氡气的脱气效率，采用了中空膜或不锈钢球。静电收集容器容量由原来的1升扩大到70升。供电电压从-120V增加到-1500V。水下氡探测器的灵敏度提高了100倍以上。新的水下氡探测器安装在以下4个地方的氡观测设施中：1)福井的“平成温泉”，2)岐阜的“神冈矿”，3)岐阜的“川边”，4)岐阜县的“瓦里石温泉”。在这些观测设施中，地下水稳定地供应给氡探测器。“平成温泉”的温泉以150升/分钟的流速流动，与超高灵敏度水下氡探测器交换后，^<214>Po的计数率提高了约130倍。从2001年11月前后开始，“平成温泉”温泉溶解气容量急剧增加。通过对电磁流量计流量波动的分析，确定了溶解气容量分为平稳期、中间期和颠簸期三个阶段。碰撞期从2002年7月4日到7月19日，从2002年10月12日到11月9日。经过2002年7月18日至8月5日和11月19日至11月10日的震荡期，水体氡浓度突然升高。从下面提到的观测点开始，在大约50公里范围内发生了两次地震。(1)福井县北部，2002年8月18日，里氏4.5级；(2)石川县南部，2002年11月17日，里氏4.5级。在地震发生约1个月前观测到溶解气容量的变化和氡密度的突然增加。这一观测结果被认为是利用高灵敏度水下氡探测仪观测到的新的震前现象。对于下面提到的氡观测结果URL，用http://111.physics.gifu-u.ac.jp/打开。少

The hollow membrane or the stainless steel ball was used in order to improve the degasifier efficiency of the dissolved radon gas in the underwater radon detector. And the capacity of the electrostatic collection vessel from 1 liter was enlarged in 70 liters. The supplied voltage from -120V was increased in -1500V. The sensitivity of the underwater radon detector was increased 100 times or more. The new underwater radon detector was installed in the radon Observation facility of below-mentioned 4 places, 1) "Heisei-Hotspa" in Fukui, 2) "Kamioka mine" in Gifu, 3) "Kawaue" in Gifu, 4) "Wari-ishi Hotspa" in Gifu Prefecture. The underground water is stably supplied to the radon detector in these observation facilitie.The hot spring has flowed with the water flow rate of the 150 liters per minute at the "Heisei hot spa", and the count rate of the ^<214>Po increased in approximately 130 times after the exchanging to the super high sensitivity underwater radon detector. The dissolved gas capa … More city in the hot spring increased suddenly from around November of 2001 at the "Heisei hot spa". The being 3 stages, calm, mid and bumping period was ascertained in the dissolved gas capacity from the flow fluctuation analysis of the electromagnetic flow meter. Bumping period was July 19th from July 4th of 2002, and November 9th from October 12th of 2002. After the bumping period, the period of August 5th from July 18th of 2002 and November 10th from November 19th, water radon concentration increased suddenly. From the observation point below-mentioned two earthquakes occurred the within approximately 50 km. (1) North of Fukui Prefecture, Magnitude 4.5 at August 18th of 2002, (2) South of Ishikawa Prefecture, Magnitude 4.5 at November 17th of 2002. Bumping the dissolved gas capacity and, after that sudden increase of radon density was observed before about 1 month of earthquake occurrence. This observation result is thought it is the new earthquake pre-seismic phenomenon which was observed making use of the high sensitivity underwater radon detector. As for radon observation result below-mentioned URL, It is open with the http://111.physics.gifu-u.ac.jp/. Less