Abstract Annual tritium exposures can be reconstructed for long time periods by analyzing radioactive concentrations in tree rings near nuclear facilities that can release tritiated water (HTO) to the environment. Since the mass of analyzed samples is on the order of milligrams, usual methods such as liquid scintillation counting cannot be applied. The recommended method comprises thermal decomposition of the milligram-sized samples, reduction of the resulting HTO to tritiated hydrogen, quantitative absorption of titanium hydride (TiHT) in titanium powder, and determination of the H/T ratio using an accelerator mass spectrometer method. This paper describes the method for obtaining TiHT standards with different H/T isotopic ratios for calibration of a mass spectrometer detector.

中文翻译：

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用于 AMS 设施校准的具有受控 H/T 比的氢化钛

摘要 通过分析可向环境释放氚化水 (HTO) 的核设施附近树木年轮中的放射性浓度，可以重建长时间的年度氚暴露。由于分析样品的质量为毫克量级，因此无法应用液体闪烁计数等常用方法。推荐的方法包括对毫克级样品进行热分解，将所得 HTO 还原为氚化氢，定量吸收钛粉中的氢化钛 (TiHT)，并使用加速器质谱仪方法测定 H/T 比。本文介绍了获取具有不同 H/T 同位素比的 TiHT 标准品以校准质谱仪检测器的方法。