L. V. Zakharova

Anodic dissolution of Tc metal in HNO3 solutions

Corrosion and dissolution of Tc metal in 0.5–6.0 M HNO3 without external sources of the redox potential and under the conditions of constant-current electrolysis were studied. The dissolution rates of Tc metal without external potential in relation to the HNO3 concentration and the rates of anodic dissolution of Tc in relation to the anodic current density and HNO3 concentration were determined. The Tc(VII) current efficiencies in 0.5–6.0 M HNO3 solutions were measured. The anodic dissolution of Tc is characterized by the linear growth of the concentration of the dissolved Tc species in solution with time. Examination of the sample surfaces by scanning electron microscopy allows a conclusion that the corrosion degradation has intercrystallite character.

Half-Life and Photon Intensities of 103Pd

The half-life and photon intensities in decay of 103Pd, which is used in nuclear medicine for preparing 103mRh isomer (T1/2 = 56 min) for irradiation of prostate cancerous growth, were determined by semiconductor X-ray and γ-ray spectrometry. The half-life of 103Pd is 16.8±0.6 days, and the relative intensities of X-ray and γ-ray photons are as follows: KαKβ = 5.1±0.4; 358 keV, 100 rel. units; 295 keV, 12.3± 0.4 rel. units, and 497 keV, 17.6±0.6 rel. units. The errors are given for confidence level of 0.95.

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:

Electrochemical dissolution of Тс–Ru alloys in nitric acid solutions

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

Half-Lives of 131-135I Nuclides

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Half-Lives and Intensities of X-ray and γ-Ray Emission of 113Sn, 117mSn, and 119mSn

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