Chemical extraction using a molecular recognition resin named “Empore Radium Rad Disk” was developed to improve sensitivity for the low concentration of radium (Ra). Compared with the previous method, the extraction process speed was improved by a factor of three and the recovery rate for |$^{226}$|Ra was also improved from |$81\pm4\%$| to |$>99.9\%$|⁠. The sensitivity on the |$10^{-1}$| mBq level was achieved using a high-purity germanium detector. This improved method was applied to determine |$^{226}$|Ra in Gd|$_2$|(SO|$_4$|⁠)|$_3{\cdot}$|8H|$_2$|O which will be used in the Super-Kamiokande Gadolinium project. The improvement and measurement results are reported in this paper.

中文翻译：

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改进的低浓度镭测量方法及其在超级神冈and项目中的应用

开发了使用名为“ Empore Radium Rad Disk”的分子识别树脂进行化学萃取的方法，以提高对低浓度镭（Ra）的敏感性。与以前的方法相比，提取过程的速度提高了三倍，并且| $ ^ {226} $ |的回收率更高。Ra也从| $ 81 \ pm4 \％$ | 到| $> 99.9 \％$ |⁠。| $ 10 ^ {-1} $ |的灵敏度 使用高纯度锗检测器可达到mBq水平。将此改进的方法应用于确定| $ ^ {226} $ | Ra的Gd | $ _2 $ | （SO | $ _4 $ |⁠）| $ _3 {\ cdot} $ | 8小时| $ _2 $ |O将在“超级神冈” Ga项目中使用。本文报道了改进和测量结果。