Abstract
Transuranium nuclides were produced by irradiating a pellet of natural uranium sulfide in the Japan Material Testing Reactor (JMTR). After irradiation, a successive separation of uranium, plutonium, americium and curium was carried out. The fractional concentrations of the nuclides238Pu,239Pu,240Pu,241Am,243Am,242Cm and244Cm were determined by α-ray spectrometry, and those of241Pu and242mAm were estimated from the build-up of α-emitting daughters,241Am and242Cm, respectively. As the yield of242Pu was too slight to be detected by α-counting, the neutron activation analysis of the plutonium fraction based on the242Pu(n, γ)243Pu reaction was carried out by γ-ray spectrometry, and it was shown that a few pg of242Pu could be determined. A burn-up of235U was also estimated by neutron activation analysis. The experimental results are compared with the calculated ones.
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