| 摘要 |
PROBLEM TO BE SOLVED: To provide a hydrogen content analyzer which can determine hydrogen contained in a highly radioactive sample, to be measured, with an unclear material kind and with an unclear density and which uses an n.γmethod. SOLUTION: A sample 1 to be measured is housed inside a neutron moderator system 2, and a neutron source 3 is arranged inside the neutron moderator system 2. Aγ-ray collimator 5 and aγ-ray detector 4 which are surrounded by aγ-ray shielding material 7 are arranged so as to face the neutron moderator system 2. The sample 1 to be measured is turned and scanned. A material which contains hydrogen is not used for a neutron moderator 2c in a direction in which theγ-ray collimator 5 is anticipated, a peak to which attention is to be paid is 2.22MeV. Aγ-ray filter 6 is put into theγ-ray collimator 5, and low-energyγ-rays are attemulated. Theγ-ray detector 4 is formed to be of an anti-Compton type so as to remove the Compton effect and the escape peak of high-energy-γ-rays. While the counted number ofγ-rays of Zr and that ofγ-rays of Fe are used, a material (neutron absorption) is discriminated and corrected. By a pulsed neutron irradiation method, the S/N ratio of a hydrogen content analyzer is increased.
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