Boots – shoes – and leggings
Patent
1990-10-31
1992-06-23
Cangialosi, Salvatore
Boots, shoes, and leggings
25037002, G01T 136
Patent
active
051249367
ABSTRACT:
Radioactivity from airborne uranium and transuranium elements is measured by utilizing two independent alpha spectroscopy techniques to subtract background alpha radiation from a gross radiation measurement to provide a net alpha count associated with just the uranium or transuranium elements of interest. An average of the two net alpha counts is computed and used as a measure of the alpha radiation or count of interest. Negative systematic errors appearing in the net alpha counts are minimized by setting any long term negative value of the net alpha count to zero. The first spectroscopy technique divides a measured alpha spectrum into n regions, where n is greater than four, and where the region of interest has the lowest range of alpha particle energies. The background radiation for the region of interest is computed as a function of the gross radiation of each region and a set of scattering functions that relate the number of alpha particles of a higher energy region appearing in a given lower energy region. The second spectroscopy technique divides the alpha spectrum into three regions, with the region of interest being a center region, and the other two regions being end regions on either side thereof. The background radiation is determined by performing an exponential interpolation of the alpha counts measured in the end regions.
REFERENCES:
patent: 4454587 (1984-06-01), Keifer et al.
patent: 4607165 (1986-08-01), Burghoffer et al.
patent: 4808827 (1989-02-01), Woollam
patent: 4888485 (1989-12-01), Becker et al.
DeHaan Daniel
Pelletier Charles A.
Cangialosi Salvatore
Science Applications International Corporation
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