Laboratory standard for radionuclides in nuclear waste |
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Authors: | G Küppers G Erdtmann |
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Institution: | (1) Research Center Jülich (KFA), Central Department of Analytical Chemistry (ZCH), D-52425 Jülich, Germany |
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Abstract: | A laboratory standard for the determination of long-lived radionuclides in nuclear waste has been prepared using concrete as matrix. It will be used to check sample preparation procedures, chemical separations and methods for the determination of nuclides, e.g., nuclear counting techniques or mass spectrometry. The material chosen was a fine-grained ready-to-use cement mixture, to which the following radionuclides were added:60Co and137Cs as -ray-emitting nuclides,99Tc,90Sr and55Fe as radionuclides emitting pure -radiation or low-energy electrons, and233U,237Np,238Pu and241Am as -emitters. Care was taken to attain a homogeneous distribution of the nuclides in the standard material. Pieces of about 1 g were formed as suitable and representative samples. Repeated analyses were carried out with the standard to check its homogeneity. The analytical procedures are described in brief. The pieces of the standard material have the same content of nuclides within ±5% at a 95% level of confidence. |
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