Abstract
THE scintillation spectrometer1 using a sodium iodide crystal (thallium-activated) identifies the incident gamma-ray energy with the response to the photo-electric, Compton and (when energetically possible) with the pair-production processes within the crystal. In sodium iodide, the photo-electric cross-section is predominant below about 0.2 MeV. and the pair-production process becomes appreciable above about 2.5 MeV. In the energy-range 0.2–2.5 MeV., the photo-electric and Compton processes are in competition. Thus, the recorded spectrum in this important range is complicated by the two-fold response of the spectrometer to each gamma-ray line.
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References
Hofstadter, R., and McIntyre, J. A., Phys. Rev., 80, 631 (1950).
Phys. Rev., 78, 619 (1950).
Albert, R. D., Rev. Sci. Instr., 24, 1096 (1953).
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PEIRSON, D. A Two-Crystal Gamma-Ray Scintillation Spectrometer. Nature 173, 990–991 (1954). https://doi.org/10.1038/173990b0
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DOI: https://doi.org/10.1038/173990b0
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