High-resolution gamma spectrometry for measurement of transuranic radionuclides: A comparison of a low axial length-to-diameter coaxial HPGe detector versus a planar HPGe detector |
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Authors: | M S Andreaco R S Seymour G N Martin |
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Institution: | (1) CTI, 810 Innovation Drive, 37928 Knoxville, TN, (USA);(2) EG&G ORTEC, 100 Midland Road, 37830 Oak Ridge, TN, (USA) |
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Abstract: | A comparison of an HPGe planar detector and an HPGe coaxial detector, both with short length-to-diameter ratios, provides empirical evidence for the advantage of the coaxial configuration in measurements of actinide radionuclides. The principal advantage is related to the lower capacitance of a coaxial detector relative to that of a planar detector, both with large active frontal areas. In addition, the higher interaction probability (efficiency) of Ge versus Si underscores the advantages of Ge for measurements of samples with -ray energies from 5 to 200 keV (235U and241Pu). The advantages are also dependent on the presence of other higher-energy -rays collimated versus diffuse-sample geometry, and (for bioassay applications) the intervening scattering mediums of bone and tissue. |
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