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Extraction chromatography in the DHDECMP—HNO3 system

II. Characteristics of the DHDECMP/XAD-4 resin on separation of trivalent actinide elements

Journal of Radioanalytical and Nuclear Chemistry
Authors: T. Kimura and J. Akatsu

Abstract  

The characteristics of the DHDECMP/XAD-4 resin on the separation of americium, curium, californium and fission products have been studied. The capacity of the DHDECMP/XAD-4 column was compared with the maximum capacity determined by batch experiment using cerium. On the other hand, the elution behaviour of the trivalent actinide elements and fission products was investigated by extraction chromatography in the DHDECMP—HNO3 system.

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Abstract  

An organic resin impregnated with DHDECMP was prepared for extraction chromatography and used for separation of the actinide elements. A known amount of inert support, Amberlite XAD-4, was contacted with a given amount of the extractant and water. By contacting the three phases for several hours at room temperature, the resin can be modified regardless of its mesh size. It is loaded with (1.13±0.03) g of DHDECMP per 1 g of the support. A given amount of the modified resin was contacted 50 times with fresh 3M nitric acid solution to remove the loosely bound extractant from the support. its amount was less than 1 weight%. As an application,241Am was recovered from 3.5M nitric acid waste solution on a column of the modified resin. Decontamination factor for the effluent was 105, while approximately 113 mg of241Am was obtained in 0.3M nitric acid eluting solution with 95% efficiency.

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Extraction chromatography in the DHDECMP—HNO3 system

I. Extraction behaviour of Ce(III) and Am(III) with the DHDECMP/XAD-4 resin

Journal of Radioanalytical and Nuclear Chemistry
Authors: T. Kimura and J. Akatsu

Abstract  

The extraction behaviour of Ce(III) and Am(III) in extraction chromatography has been investigated on the basis of partition and infrared studies. The stationary phase was purified undiluted DHDECMP supported on Amberlite XAD-4 and the mobile phase was nitric acid. The results have shown that the equilibria for the extraction of Ce(III) and Am(III) by the DHDECMP/XAD-4 resin agreed very closely with those in solvent extraction.

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Abstract  

Amounts of239Pu in alpha-bearing wastes were determined by -ray measurement using a NaI/Tl/ scintillation detector. The deviations of measurement caused by the nonuniform distribution of239Pu in the wastes and by a volume factor were corrected by rotating and scanning the objects. Contribution from241Am coexisting with239Pu was also corrected by taking into account the difference of the counts between A /356–470 keV/ and B /475–620 keV/ intervals. Attenuation of -ray of239Pu was estimated from the matrix density. Thus the content of239Pu could be determined within an accuracy of about 25% at the 1 mg level in a cardboard carton of 17 1.

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Abstract  

A non-destructive method for determining the amount of actinoids has been developed. The method is based on thermal neutron coincidence counting and employs a selective detection of neutrons resulting from the spontaneous fission of actinoids. The detection system is described in detail and the measurement results of244Cm as an example are presented. The results show that the measured fission rate of244Cm is consistent with the fission rate calculated from ENDF/B-V data and that the amount of244Cm can be determined within about 5% accuracy even in the presence of a large amount of actinoids, for example, up to 2.6·106, 3.6·104, or 1.6·103 times in the mass ratio of239Pu,241Am, or240Pu to244Cm, respectively.

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