Improved method for measuring low concentration radium and its application to the Super-Kamiokande Gadolinium project

Abstract

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$\pm$4% 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.

arXiv comment8 pages, 3 figures

References in corpus (4)

• GADZOOKS! Antineutrino Spectroscopy with Large Water Cerenkov Detectors
• Solar Neutrino Measurements in Super-Kamiokande-IV
• The Diffuse Supernova Neutrino Background is detectable in Super-Kamiokande
• Determination of Trace Levels of Uranium and Thorium in High Purity Gadolinium Sulfate Using ICP-MS with Solid-Phase Chromatographic Extraction Resin