14MeV中性子による窒素およびリンの放射化分析

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Nitrogen and phosphorus contents in various compounds were determined by means of 13N [14N (n, 2n), T1/2=10 min.] and 28Al[31P (n, α), T1/2=2.3 min.] radioactivities, which were produced by 14 MeV neutron irradiation. The sample of 25 g was packed in a polyethylene rabbit capsule and an inner standard (copper plate for nitrogen analysis and quartz for phosphorus analysis) was attached on the cup of the rabbit capsule. It was irradiated with 14 MeV neutrons by T-d reactions with a Cockroft-Walton type accerelator, and then the radioactivity was measured by a well type NaI scintilation detector connected with a single channel pulse height analyzer. Five min. irradiation and 0.51 MeV photopeak counting was adopted for the nitrogen analysis. And 2.5 min. irradiation and total gamma-rays higher than 1.40 MeV were adopted for phosphorus analysis. The radioactivity produced in each sample was normalized with an inner standard. By this method, nitrogen and phosphorus content in various compounds, particuraly organic compounds can be determined rapidly and nondestructively with an error less than 5 per cent. When the neutron flux could be elevated to 1.0×107 n per cm2 per sec. the limit of detection may be about 10 mg for nitrogen and 7 mg for phosphorus, equivalent to 0.2 % of N and 0.15% of P with each 5 g sample.
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