Radiant energy – Invisible radiant energy responsive electric signalling – Methods
Patent
1994-08-02
1997-05-13
Hannaher, Constantine
Radiant energy
Invisible radiant energy responsive electric signalling
Methods
25037003, G01T 1167
Patent
active
056295251
ABSTRACT:
A method determining the plutonium content of a material containing fluorine involves obtaining the mass ratio of plutonium in a compound comprising plutonium and fluorine, particularly plutonium tetrafluoride, to the total plutonium content. The method utilises a high resolution gamma ray spectrometry technique to obtain a count rate in a pair of gamma ray photopeaks. One of the photopeaks has an energy level of 414 keV, resulting from the decay of plutonium-239, and the other photopeak has an energy level of 583 keV, resulting from the decay of an excited sodium-22 nucleus following an (alpha,n) interaction with fluorine.
REFERENCES:
T. V. Rebagay, G. A. Huff, and K. J. Hofstetter, "Automated Monitoring of In-Process Plutonium Concentration." Anal. Chem. vol. 54, No. 1 (Jan. 1982) pp. 8-12.
T. Dragnev and K. Scharf, "Non-destructive Gamma Spectrometry Measurement of .sup.239 Pu/.sup.240 Pu and Pu/.sup.240 Pu Ratios." International Journal of Applied Relations and Isotopes, vol. 26, No. 3 (Mar. 1975) pp. 125-129.
Burnett Christine A.
Orr Christopher H.
Thornley David J.
British Nuclear Fuels PLC
Hannaher Constantine
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