A Determination of the Equilibrium Constant of HTO-H_2S Reaction

The equilibrium constants of the chemical exchange reaction between HTO and H_2S are determined at 1 atm to enrich tritiated water. The separation factor of one stage is defined, and it is increasing with the increase of temperature in the batch method. For the first step to make a practical application of the chemical exchange reaction to enrich tritium, the H_2S gas circulation method is investigated

Production of Curium by the Neutron Irradiation of Americium-241

^Am was irradiated by the Japan Material Testing Reactor. The group separation of transuranium elements from fission products and cladding materials were carried out, and then Np, Pu, Am and Cm were isolated by using the ion exchange method. The isotopic ratios of Cm and Am were determined by the α- and γ-ray spectrometry

Irradiation of Natural Uranium by the Neutrons of the Japan Material Testing Reactor

A 2.76 g of natural uranium dioxide was irradiated by the neturons of JMTR for about 60 days from the 7th cycle to the 9th cycle. U and Pu were isolated and the isotopic ratios were measured. The nature of the neturon capture reactions was discussed

The Chemistry of Protactinium : X. A Study of the Effect of Chromium(II) on the Solvent Extraction of Protactinium(IV), Using N-Benzoyl-N-phenylhydroxylamine, Tri-n-octylamine and Thenoyltrifluoroacetone as the Extractants(Chemistry)

Cr(II) has been used for reducing protactinium in microquantities to the tetravalent state and for protecting it from re-oxidation. However, the effect of Cr(II) on the extraction behavior of Pa(IV) has not been taken into account by all of the previous investigators. On the basis of the above facts, the influence of Cr(II) on the extraction of Pa(IV) was studied by using such extractants as BPHA, TAA, and TOA. In every case, the distribution ratio of Pa(IV) decreased with an increase in the concentration of Cr(II) in the aqueous phase. One of the most reliable explanations for the phenomena is the possibility that a multi-nuclear complex between Pa(IV) and Cr(II) or Cr(III) is formed. However, the effect of Cr(II) on the absorption spectra of Pa(IV) could not be found, and many more experiments will be necessary to explain the effect of Cr(II) on the extraction behavior of Pa(IV)

The Chemistry of Protactinium : XI. A Study of the Solvent Extraction of Protactinium(IV) Reduced with Europium(II) from a Perchloric Acid Solution, Using Thenoyltrifluoroacetone as the Extractant(Chemistry)

Europium(II) was found to be an excellent reductant for reducing protactinium in microquantities to the tetravalent state. The behavior of Pa(IV) in the perchloric acid solution was investigated by the TTA-benzene extraction method. It was found that the PaOH^ ion existed predominantly in a 0.03-3 M perchloric acid solution at the ionic strength of 3. The reaction of TTA extraction may proceed as : PaOH^+4HA = PaA_4+H_2O+3H^+ or PaOH^+4HA = Pa(OH)A_3(HA)+3H^+ The distribution ratio of Pa(IV) in the system using Eu(II) as the reductant is about ten times as large as that in the system using Cr(II) as the reductant. It was considered that a non-extractable complex may be formed between Pa(IV) and Cr(III), while such a complex may not be formed when Eu(II) is used as the reductant