Measurement of low concentrations of hydrogen in small samples by intermediate neutron moderation |
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Authors: | N Wada |
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Institution: | (1) Radioisotope Center, Japan Atomic Energy Research Institute, Ōarai-machi, Ibaraki-ken, (Japan) |
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Abstract: | An improved method based on the moderation of intermediate neutrons for the measurement of hydrogen in small samples is described.
With the aid of boron and cadmium filters, a space shielded from slow neutrons is set up close to an isotopic neutron source
shrouded by water moderator. A BF3 proportional counter enclosed with a sample cell is placed in this space. The neutron count rate of the counter increases
when a hydrogen-containing material is introduced into the cell, due to the moderation of intermediate neutrons passing through
the filters. With a 1.3 μg252Cf neutron source, the lower limit of hydrogen detection for 200 ml samples in 10 min count time is 0.01 wt.%. This method
is suitable for measuring the H2O content of heavy water. |
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