Providing information

Details Providing information Providing information

2008-09-30

2008-09-30

Sung, Christine (Department: 2884)

Radiant energy

Invisible radiant energy responsive electric signalling

Methods

Reexamination Certificate

active

11184269

ABSTRACT:
By considering ratio of emissions at one or more pairs of energies to threshold values, the invention provides for the determination of the dispersion format of a radioactive material within a matrix, wherein said radioactive material is potentially present in a dispersion format which is self-shielding against emissions arising from said radioactive. In particular the presence of lumpy material or the confirmation that lump material is absent may be provided. The following pairs of energies: 143.8 keV and 185.7 keV; 163.3 keV and 185.7 keV; 205.3 keV and 187.5 keV may be used.

REFERENCES:
patent: 4492863 (1985-01-01), Smith, Jr.
patent: 4585939 (1986-04-01), Arnold et al.
patent: 4617169 (1986-10-01), Brodzinski et al.
patent: 2003/0205677 (2003-11-01), Caldwell et al.
J. Steven Hansen,Tomographic Gamma Scanning of Uranium A New Lump Correction Technique,7thInternational Conference of Facility Operations-Safeguards Interface, Feb. 29-Mar. 5, 2004, Charleston, South Carolina, pp. 1-7.

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