Development of a high sensitivity detector for Radium in water and a study of Rajium removal.

开发水中镭的高灵敏度检测器并研究镭的去除。

• 批准号: 07554003
• 负责人: KAJITA Takaaki
• 金额: $ 9.34万
• 依托单位: University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07554003/
• 关键词: Radium; pure water; Radon; 太陽ニュートリノ

A high sensitivity detector for Radium in water was developed. This detector measures Radons which are the decay product of Rajium. Radons are extracted from the water into the air by the bubbling method. The volume of the sample water is 700 liters. And a 70-liter Radon detector for air is used to detect Radons. The sensitivity of the detector to the Radium concentration in water is about 1mBq/m^3.We measured the Radium concentration of the pure water in the 50,000 ton Super-Kamiokande detector. The measured value was 0.9 (]SY.+-。[) 0.1 (stat.) (]SY.+-。[) 0.1 (syst.) mBq/m<@D13@>D1, or equivalently, 68.4 (]SY.+-。[) 6.4 (]SY.+-。[) 7.7Ra/cm<@D13@>D1. This level of Radium concentaration was the goal when we started this research.We also studied what elements used in the water purification sustem are capable of removing Radium efficiently. This measurement was carried out using the kamiokande water which contained more than 100 times more Radium. We observed that Radium can be removed efficintly by Reverse-Osmosis membrane, Ultra-filter and activated charcoal.

研制了一种高灵敏度的水样中镭的检测装置。这个探测器测量的是氡，这是拉吉姆的衰变产物。用鼓泡法将水中的氡提取到空气中。样品水的体积为700升。而一个70升的空气氡探测器被用来检测氡。该探测器对水中镭浓度的灵敏度约为1mBq/m~3。我们在5万吨的Super-Kamiokande探测器上测量了纯水中的镭浓度。实测值为0.9(]sy.+-。[)0.1(统计)(]SY+-。[)0.1(系统)Mbq/m&lt；@d13@&gt；d1，或相当于68.4(]sy.+-)。[)6.4(]正数+-。[)7.7Ra/cm；d13@&gt；d1。当我们开始这项研究的时候，我们的目标是达到这种水平的镭浓缩。我们还研究了在净水系统中使用的哪些元素能够有效地去除Re。这项测量是使用卡米奥坎德水进行的，卡米奥坎德水中的镭含量是它的100多倍。实验结果表明，反渗透膜、超滤膜和活性炭能有效去除水中的镉。

项目成果

根本 真知子 他: "静電補集型超高感度空気中ラドン検出器の開発" PADIOISOTOPES. 46・10. 710-719 (1997)

Machiko Nemoto 等：“静电收集型超灵敏空气氡探测器的开发” PADIOISOTOPES 46・10 (1997)。

根本真知子他: "静電捕集型超高感度空気中ラドン検出器の開発" RADIOISOTOPES. 46・10. 710-719 (1997)

Machiko Nemoto 等：“静电收集型超灵敏空气氡探测器的开发”RADIOISOTOPES 46・10 (1997)。

M.Nemoto et al.: "Development and calibration of a high sensitive radon detector in air" Contribution paper to “Radon and Thoron In the Human Envioronment". (作成中). (1997)

M.Nemoto 等人：“空气中高灵敏度氡气探测器的开发和校准”对“人类环境中的氡气和钍气”的贡献论文（1997 年）。

M.Nemoto et al.: " "Development of a high sensitive Radon detector with electrostatic collection" (in Japanese)" RADIOISOTOPES. Vol.46. 710-719 (1997)

M.Nemoto 等人：““开发具有静电收集功能的高灵敏度氡气探测器”（日语）”放射性同位素。

M.Nemoto et al.: "Development and calibration of a high sensitive radon detector in air" Constribution paper to "Radon and Thoron in the Human Envioronment" Fukuoka, Japan. (1997)

M.Nemoto 等人：“空气中高灵敏度氡气探测器的开发和校准”向日本福冈“人类环境中的氡气和钍气”的投稿论文。