Radiation Damage to TBP/Kerosene Solvent

Ishihara, Takehiko; Tsujino, Takeshi; Yamamoto, Yutaka

doi:10.3327/jaesj.2.659

Cited by 10 publications

(3 citation statements)

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“…Comparison of the present results with those in the tributyl phosphate-nitrate system already reported (5), makes clear that the effect on the behavior change of uranium and fission products is not so large in the amine system as in the tributyl phosphate system. In this point amines are superior to tributyl phosphate.…”

Section: Radiationsupporting

confidence: 80%

Radiation Damage to Amine Extractants, (I)

Ishihara¹,

Tsujino²,

Komaki³

1962

Journal of the Atomic Energy Society of Japan / Atomic Energy S

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Section: Radiationsupporting

confidence: 80%

Radiation Damage to Amine Extractants, (I)

Ishihara¹,

Tsujino²,

Komaki³

1962

Journal of the Atomic Energy Society of Japan / Atomic Energy S

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“…(3) The uranium distribution ratio decreased with increasing nitric acid concentration above 5 N, with rising temperature, and also with increasing contents of olefinic and aromatic hydrocarbons in the kerosene. It is suggested that the decrease of uranium distribution ratio may be due to kerosene degradation causing the formation of complexes of carboxylic acids.…”

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confidence: 97%

Chemical Degradation of Kerosene Diluent with Nitric Acid

Ishihara

Ohwada

1966

Journal of Nuclear Science and Technology

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Chemical degradation of kerosene diluent with nitric acid was studied to clarify its effect on uranium distribution ratio and fission product retention in the presence of degradation products. The decontamination of fission products retained in degraded kerosene was also investigated.From the results of' infi·ared spectrometry, it was recognized that nitro compounds, carboxylic acids, nitrate esters and nitroso compoumls were formed as the main degradation products. The uranium distribution ratio in the extraction with TBP /degraded kerosene decreased with increasing concentration of nitric acid ahovc 5 N, with rising temperature, and with increasing concentration of olefinic and aromatic hydrocarhons in the kerosene. It is suggested that the decrease of uranium distribution ratio may l1e due to the formation of carboxylic acids caused by the kerosene degradation. Some fission products, in particular "Zr-"'Nb and ""1, were retained in the organic phase, but lOBRu-1 0 6 Rh did not remain after scmhhing with 3 N HNO:~. Fission product retention caused a decrease of' uranium distribution ratio. Usual acid-alkali washing could not remove 05 Zr-"'Nh and 131 I into the aqueous phase, hut '"Zr-115 Nb was eliminated by oxalic acid washing.

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“…in the aqueous phase after extraction Concentration of U, Th or F.P. in (1) St% the aqueous phase after stripping X 100 Concentration of U, Th or F.P. in the organic phase before stripping ( 2) While, strictly speaking, the scrubbing percentage should be determined experimentally by the equation defined in a previous paperC9l, since only approximate values were required in this study, it was assumed that the scrubbing step operates under the same 145 concentration of HNOa as the succeeding extraction step, so that data pertaining to extraction could be utilized for determining scrubbing percentage:…”

Section: Figl Experimental Proceduresmentioning

confidence: 99%

Radiation Damage to TBP/Kerosene Solvent, (II)

Tsujino

Ishihara

1966

J. Nucl. Sci. Technol.

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Radiation damage to 30;.·,:; TBP/kerosene was investigated to determine changes in the extraction behavior of uranium and thorium with the solvent irradiated up to 10 9 R in nitrate system and similarly in the stripping behavior with 0.01 N nitric acid.The effect on uranium and thorium was discernible only with irradiations reaching 109 R.Changes in the behavior of fission products present in company with uranium or thorium were found to be the similar to the case where they existed free of uranium or thorium, At irradiations below 10 7 R, uranium and thorium manifested loading efFect, but it disappeared when irradiation reached 10 8 R.Calculation of one stage decontamination factors of fission products from uranium and thorium confirmed deterioration of the power of separation with irradiation, and the degree of deterioration was determined quantitatively. The decontamination factor for 95 Nb was decreased to l/2,000 by irradiation to lOB R, while the same dosage of irradiation had little effect for t06Ru-'o•Rh.Physical properties such as density, viscosity, emulsification tendency and phase separation time were also observed to be effected by irradiation to lOB R.

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Radiation Damage to TBP/Kerosene Solvent

Cited by 10 publications

References 0 publications

Radiation Damage to Amine Extractants, (I)

Radiation Damage to Amine Extractants, (I)

Chemical Degradation of Kerosene Diluent with Nitric Acid

Radiation Damage to TBP/Kerosene Solvent, (II)

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