Measurement of Radon and daughter activity in air

1.空气中氡及其子体的测量。同时对室内和室外空气中的氡及其子体进行了测量。由于附着在墙壁、地板和天花板上的空气中去掉了更大的原子核，室内空气中氡和子体之间的放射性平衡没有得到维持。另一方面，氡子体附着在气溶胶上并存在于空气中，室外的氡子体辐射率接近1。该材料的附着系数为(1.3±0.3)×10~(-3)cm~(-3)/S，沉积速度为(1.6~5.7)×10~(-3)m/s~2。水中的氡浓度。提出了一种用~(214)Gt；~(214)Ph的伽马能谱测定水中氡的方法。直接测量了浓度较高的100cc地下水中的氡浓度。将索伦萃取法应用于低浓度地表水的测定。发现高氡地下水存在于位错区和花岗岩地层中。这些地层分布在广岛的东南部和西北部地区。

1. Measurement of radon and its daughters in air. Simultaneous measurement of radon and its daughters were performed for indoor and outdoor air. Since daoughter nuclei were removed in the air attaching to wall, floor, and ceiling, radioactive equillibrium among radon and daughters was not held in indoor air. Qn the other hand, radon daughters attach to aerosol and exist in the air, radtios of radon and daughters is nearly 1 in the out door. The attachment factor of ^<218>Po was (1.3(〕SY.+-.〔)0.3)x10^<-3> cm^3/s and the deposition velocity was (1.6-5.7)x10^<-3> m/s.2. Radon concentration in water. A method for the measurement of radon in water was developed through gamma-ray stectroscopy of ^<214>Pb. Radon cancentration was diredtly measured for the 100 cc ground water which were rather high concentration. A thoruen extraction method was applied peror to the measurement for the surface water which were low concentration. It was found that ground water with high radon concentraion existed in the dislocation area as well as the granit stratum. Such stratum distributed in south-east area and north-west areas in Hiroshima.