Isotopic composition of plutonium-238 from Americium-241 and reactor crosssections of actinide nuclides

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Abstract

242Cm was prepared by irradiating 241Am in the reactor BR2, Mol, Belgium. It was separated from other actinides and fission products by ion exchange. 238Pu obtained by decay of 242Cm is best suited for biomedical purposes since it is practically free from hazardous isotopic impurities like 236Pu, for which an upper limit of 0·1 ppm was obtained. The concentrations of heavier plutonium isotopes were between 20 and 2000 ppm.

Fractional concentrations of the various nuclides were determined by mass spectrometry and by α-counting. Effective reactor cross-sections for the involved nuclides computed from these measurements are discussed.

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    On leave from Bhabha Atomic Research Centre, Bombay, India.

    EURATOM, Mol, Belgium. Present address: Fried. Krupp GmbH, Essen, Germany.

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