Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1990-08-31
1992-04-28
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
2503591, 364511, G08B 2100
Patent
active
051092271
ABSTRACT:
A plurality of fixed gamma ray detectors is deployed along a corridor or other path to be taken by a targeted nuclear source. Each fixed gamma ray detector and its associated electronics splits the spectrum of any gamma rays detected into two energy groups, one on either side of a predetermined and variable discrimination line along the energy base line. A plurality of paired single channel analyzers (dual channel analyzer), each pair collocated and electronically connected with a gamma ray detector, records the count of each portion of the detected gamma ray spectrum. A host computer computes the ratio between the radiation counts of the two energy groups on a recurring basis and compares the ratio taken on one reading of the detectors with the ratio taken on a previous reading of the detectors. An audible or visual alarm, connected to the computer, is produces when the ratio between the two energy groups has changed or has not met an expected value. To avoid simulation of the nuclear source, the coverage of the two energy groups together, in relation to the total spectrum of the detected gamma ray, or to each other, can be varied and the ratios between the upper and lower portions can be manipulated by changing the position of the discrimination line between the two energy groups. A series of the ratios obtained could be used collectively to identify the gamma emitting sample.
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Reynolds Benoni O.
Swann III Glen R.
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