We demonstrate a method for measuring the H produced in water from the B(n,α)Li fission reaction. Low energy neutrons from the NIST Center for Neutron Research interact with borate-containing water in a temperature-controlled high pressure cell made from titanium. After exposure for one to several hours, the water is extracted and sparged with argon. H entrained in the sparging gas is sampled with a small mass spectrometer. To determine the neutron exposure, a small amount of sodium is included in the borate solution. The water is collected and Na activation is measured in a counting apparatus on the following day. The G-value for H at room temperature is found to be (1.18 ± 0.10) molecules H/100eV, in good agreement with previous estimates and recent modeling calculations.

中文翻译：

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水中 10B(n,α)7Li 反应生成 H2


我们演示了一种测量 B(n,α)Li 裂变反应在水中产生 H 的方法。来自 NIST 中子研究中心的低能中子在由钛制成的温控高压电池中与含硼酸盐的水相互作用。暴露一到几个小时后，提取水并用氩气喷射。使用小型质谱仪对喷射气体中夹带的 H 进行采样。为了确定中子暴露量，在硼酸盐溶液中加入少量钠。收集水并在第二天在计数装置中测量Na活化。室温下 H 的 G 值为 (1.18 ± 0.10) 分子 H/100eV，与之前的估计和最近的建模计算非常一致。