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.
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| http://dx.doi.org/10.1016/j.radphyschem.2020.109319 | DOI Listing |
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