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<p>Natural radium isotopes (<sup>226</sup>Ra, <sup>224</sup>Ra, <sup>223</sup>Ra, and <sup>228</sup>Ra) in groundwater reflect aquifer geochemistry, especially in uranium- and thorium-rich formations. This study compares three methodologies (M1, M2, M3) for measuring them in waters. M1 used the detection efficiency based on gamma energies from <sup>228</sup>Ac to generate an efficiency <i>vs.</i> energy calibration curve. M2 utilized U and Th standards, consisting of pitchblended and monazite sand, to obtain the calibration curves. M3 accounted for matrix effects using a calibration curve based on <sup>226</sup>Ra standards solutions of varied activity concentration. The methods were applied to groundwater samples provided from different Brazilian aquifer systems.</p>

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Calibration methods for radium isotopes determination in waters by gamma-ray spectrometry using an HPGe detector

  • 期刊论文

  • 发表日期：

    2025年10月17日

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  • Marta L. V. Patricio,
  • Daniel M. Bonotto

摘要

Natural radium isotopes (226Ra, 224Ra, 223Ra, and 228Ra) in groundwater reflect aquifer geochemistry, especially in uranium- and thorium-rich formations. This study compares three methodologies (M1, M2, M3) for measuring them in waters. M1 used the detection efficiency based on gamma energies from 228Ac to generate an efficiency vs. energy calibration curve. M2 utilized U and Th standards, consisting of pitchblended and monazite sand, to obtain the calibration curves. M3 accounted for matrix effects using a calibration curve based on 226Ra standards solutions of varied activity concentration. The methods were applied to groundwater samples provided from different Brazilian aquifer systems.