Abstract
The radioactive nuclides 124Sb (T 1/2=60.3d) and 125Sb (T1/2=2.77yr) were produced from natural antimony by JRR-3 reactor irradiation of 283.5 h through the single and double capture processes. After cooling of 3.50 yr, the γ-ray spectrum of the antimony sample irradiated was measured by a 50 cc coaxial type Ge(Li) detector, and the photo-peak yield ratio of 125Sb (E r=428keV) to 124Sb (E r=1.691 MeV) was obtained. By using a relation between this photo-peak yield ratio and the 124Sb (n, γ) 126Sb cross section, the reactor neutron capture cross section of 60.3-day 124Sb was obtained as 17.4:5:+2.8 −2.5b. The thermal neutron flux at the position of antimony sample irradiated was estimated as (4.92±0.38) ×1012n/cm2·s by measuring the 1.333-MeV photo-peak yield of 60Co, which was activated by reactor irradiation of cobalt impurity contained in the antimony sample.
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