Radiant energy – Invisible radiant energy responsive electric signalling – With or including a luminophor
Patent
1993-10-29
1995-05-02
Fields, Carolyn E.
Radiant energy
Invisible radiant energy responsive electric signalling
With or including a luminophor
250362, G01T 1204
Patent
active
054122163
ABSTRACT:
Methods and apparatus are provided for identifying a radionuclide in a liquid sample containing at least one unknown radionuclide, in which specific properties which are essentially linear over extended quench ranges are employed as the primary basis for identifying the radionuclide. For example, the endpoint or maximum energy of a sample is related to Mantel's average energy or a property proportional to the average energy (such as isotope center number) in order to establish characteristic relationships for radionuclides of interest; comparison of measured values with characteristic values for specific radionuclides may in some cases be sufficient to identify a radionuclide unambiguously. The relationships between isotope center number, full width of the spectrum at half its maximum height and maximum energy may be exploited to provide a pair of characteristic equations for each radionuclide. In those instances where some ambiguity might arise, other features of the spectrum (such as maximum peak height or number of peaks present) are employed to distinguish between nuclides which are not clearly identified by the first step.
REFERENCES:
patent: 4075480 (1978-02-01), Horrocks
patent: 4742226 (1988-05-01), De Filippis
Mantel, J., The Beta Ray Spectrum and the Average Beta Energy of Several Isotopes of Interest in Medicine and Biology, International Journal of Applied Radiatio and Isotopes, vol. 23, pp. 407-413, (1972).
Beckman Instruments Inc.
Fields Carolyn E.
Grant Arnold
Henry Janis C.
May William H.
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