Measurement of Radon and daughter activity in air

空气中氡气及其子体活度的测量

• 批准号: 04805006
• 负责人: SHIZUMA Kiyoshi
• 金额: $ 1.22万
• 依托单位: HIROSHIMA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04805006/
• 关键词: Radon; Radon daughter; Air concentration; r-ray spectroscopy; d-ray spectroscopy; Free xomponent; Diffusion tube; Fiiter method

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.

1.空气中氡及其子体的测量。同时测量室内和室外空气中的氡及其子体。由于室内空气中的氡子体被去除，附着在墙壁、地板和天花板上的氡子体之间的放射性平衡不再维持。另一方面，氡子体附着在气溶胶上存在于空气中，室外氡子体与氡子体的比值接近1。其附着因子<218>为（1.3 ± 0.5）SY.（）0.3）× 10 ~<-3>（-3）cm ~ 3/s，沉积速度为（1.6-5.7）× 10 ~（-3）<-3>m/s。水中氡浓度本文提出了一种用γ射线能谱法测定水中氡的方法<214>。对100cc高浓度地下水进行了氡浓度直接测量。将钍试剂萃取法应用于低浓度地表水的测定。结果表明，在断层错动区和花岗岩地层中均存在高氡地下水。该地层分布于广岛的东南部和西北部。

项目成果

静間清: "アイソトープ中央実験施設のGe半導体検出器の遮敬と低バックグラウンドガンマ線スペクトロメータによる水中ラドン濃度の測定法の開発" 広島大学工学部研究報告. 41. 117-125 (1993)

Kiyoshi Shizuma：“利用中央同位素实验设施的Ge半导体探测器和低本底伽马射线光谱仪的屏蔽来测量水中氡浓度的方法的开发”广岛大学工程学院的研究报告41。 117-125 (1993)

K.Shizuma: "Low-background gamma-ray Spoctrometer of radioistope cantral Laboratory and its application to the measurement of radon concentration in water" Bulletin of the Faculty of Engineeing. Hiroshima Umiversity. 41 (1993)

K.Shizuma：“放射性同位素中心实验室低本底伽马射线分光计及其在水中氡浓度测量中的应用”工学院通报。

静間 清: "アイソトープ中央実験施設のGe半導体検出器の遮蔽と低バックグラウンドガンマ線スペクトロメトリによる水中ラドン濃度の測定法の開発" 広島大学工学部研究報告. 41. 117-125 (1993)

静间清：“通过屏蔽中央同位素实验设施的Ge半导体探测器和低背景伽马射线光谱法来测量水中氡浓度的方法的开发”广岛大学工学部的研究报告41。117-125（。 1993）

K.Fukami: "Collection Efficiency of the Nuclepore Membrane Filter for Aerosol Sampling and Its Application to ^<218>Po Measurement" Jpn.J.Appl.Phys.31. 3699-3700 (1992)

K.Fukami：“用于气溶胶采样的核孔膜过滤器的收集效率及其在 ^<218>Po 测量中的应用”Jpn.J.Appl.Phys.31。

静岡 清: "工学部における放射線取扱者の被ばく線量の評価" 広島大学工学部研究報告. 42. 1-11 (1993)

Kiyoshi Shizuoka：“工程学院辐射处理人员的暴露剂量评估”广岛大学工程学院研究报告42. 1-11 (1993)。