G. A. Timofeev

Nuclear-Physical Properties of 188W, 188Re, and 188Os

The half-lives, intensities, and some other parameters of β-, γ- and X-ray radiation of 188W, 188Re, and 188Os, which are used in engineering and nuclear medicine, were determined by semiconductor X-ray and γ-ray spectrometry. The half-lives (T1/2) of the radionuclides are as follows: 69.5(7) days (188W) and 17.007(15) h (188Re). The intensity ratio of X-ray transitions Kα1/Kα2 and Kα/Kβ (188Os) are 1.7(2) and 3.8(5), respectively. The intensity of γ-radiation of 188W and 188Re and the maximal energy of 188Re β-radiation (2200 keV) were measured.

Decay of 175Hf and 181Hf

AbstractNuclear-physical properties of 175Hf and 181Hf produced by neutron irradiation of natural hafnium in the SM-3 nuclear reactor were studied. The X-ray and γ-ray spectra were measured with high-energy-resolution HPGe and Ge(Li) detectors. The half-lives T1/2 (days) were determined: 175Hf 71.9±1.3 and 181Hf 42.12±0.25. The relative intensities (rel. units) of the γ-ray lines (keV) of 181Hf are as follows: 133.03, 54.0±1.6; (136.28 + 136.86), 8.9±0.3; 345.919, 20.4±0.6; and 482.193, 100. The ratios of the intensities in the X-ray spectrum were measured:

Half-Lives of 131-135I Nuclides

^{{175}} {Lu}K_{{\beta }_{1,3} } /^{175} {Lu}K_{{\beta }_{2} } = 3.96(12)

Identification of ²â´â¶Pu, ²â´â·Pu, /sup 246m/Am, and ²â´â·Am and determination of their half-lives

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RADIOACTIVE DECAY OF ACTINIDES

^{181} {Ta}K_{{\beta }_{{1,3}} } /^{181} {Ta}K_{{\beta }_{2} } = 3.72(11)

ABSOLUTE OUTPUT OF M X-RAY RADIATION FROM ISOTOPES OF TRANSPLUTONIUM ELEMENTS

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