Applications of beta spectroscopy Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/8623j2039

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  • Two applications of beta spectrometry using active gamma-ray discrimination are described. The beta spectra of smears taken at a nuclear power plant at the end of a 300 day shutdown were characterized. The average beta energy at "contact" (1.5 cm) was between 450 and 550 keV for locations influenced by activation products and slightly higher for locations with a high percentage of fission products. The spectrum hardened about 300 keV at the normal working distance of 30.5 cm. The possibility of pure beta emitters in the spectrum was investigated by comparing a composite beta spectrum consisting of nuclides identified by gamma-ray spectrometry to the beta spectrum from the smear. There was no indication of significant amounts of pure beta emitters in the spectra. The second application of beta spectroscopy was developed, in conjunction with liquid scintillation counting, to measure the presence and radioactivity level of calcium-45 in apple juice prior to administration to human subjects. Although the calcium-45 activities determined by beta spectroscopy and liquid scintillation counting consistently agreed, they both differed by about 2O% when compared to the calcium-45 activity expected in the solution to be administered. However, even in view of this difference, the analytical technique developed during this study verified that the calcium-45 activity was well within the range required for use in a human blood absorption investigation. By comparing the beta spectrum from radioactivity in the apple juice to a known calcium-45 beta spectrum, the technique also confirmed that calcium-45 was the only radionuclide present in the apple juice.
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  • Master files scanned at 600 ppi (256 Grayscale) using Capture Perfect 3.0 on a Canon DR-9080C in TIF format. PDF derivative scanned at 300 ppi (256 B&W), using Capture Perfect 3.0, on a Canon DR-9080C. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
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  • description.provenance : Submitted by Patricia Black (patricia.black@oregonstate.edu) on 2009-01-14T17:13:38Z No. of bitstreams: 1 Pratt_David S._1994.pdf: 518622 bytes, checksum: 19616aa064055e7c30e92da80217b92e (MD5)
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  • description.provenance : Approved for entry into archive by Linda Kathman(linda.kathman@oregonstate.edu) on 2009-01-14T17:16:46Z (GMT) No. of bitstreams: 1 Pratt_David S._1994.pdf: 518622 bytes, checksum: 19616aa064055e7c30e92da80217b92e (MD5)
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