Direct fissile assay of enriched uranium using random self-inter

Details Direct fissile assay of enriched uranium using random self-inter Direct fissile assay of enriched uranium using random self-inter

1985-02-04

1986-10-14

Fields, Carolyn E.

Radiant energy

Invisible radiant energy responsive electric signalling

Neutron responsive means

250391, G01T 300

Patent

active

046174664

ABSTRACT:
Apparatus and method for the direct, nondestructive evaluation of the .sup.235 U nuclide content of samples containing UF.sub.6, UF.sub.4, or UO.sub.2 utilizing the passive neutron self-interrogation of the sample resulting from the intrinsic production of neutrons therein. The ratio of the emitted neutron coincidence count rate to the total emitted neutron count rate is determined and yields a measure of the bulk fissile mass. The accuracy of the method is 6.8% (1.sigma.) for cylinders containing UF.sub.6 with enrichments ranging from 6% to 98% with measurement times varying from 3-6 min. The samples contained from below 1 kg to greater than 16 kg. Since the subject invention relies on fast neutron self-interrogation, complete sampling of the UF.sub.6 takes place, reducing difficulties arising from inhomogeneity of the sample which adversely affects other assay procedures.

REFERENCES:
patent: 3636353 (1972-01-01), Untermyer
patent: 3736429 (1973-05-01), Foley
patent: 3786256 (1974-01-01), Untermyer
Gozani, "Active Nondestructive Assay of Nuclear Materials", NUREG/CR-0602, pp. 507-520, Jan. 1981.
Rogers, "Handbook of Nuclear Safeguards Measurement Methods", NUREG/CR-2078 (MLM-2855), pp. 4-6, 74-84, 174-178, 208-216, 259, 260, 269, 272, Sep. 1983.
Stewart et al, "Direct Fissile Assay of Highly Enriched UF.sub.6 Using Random Self-Interrogation and Neutron Coincidence Response", Los Alamos Nat. Lab., LA-UR-83-3266, May 1984.

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