Radiant energy – Automatic/serial detection of similar sources
Patent
1976-10-22
1979-04-24
Dixon, Harold A.
Radiant energy
Automatic/serial detection of similar sources
250369, G01T 100
Patent
active
041514122
ABSTRACT:
An automatic spectrum scanning technique for use in a proportional counting instrument, such as a gamma counter or liquid scintillation counter, by means of which a pulse-height or energy spectrum of a sample can be obtained automatically and without multichannel instrumentation. A pulse-height analyzer in the counting instrument has its upper and lower discriminator limits set to define a relatively narrow counting window, and the limits are successively changed to scan the window across the energy spectrum and thereby obtain an accurate measurement thereof. Counting at each increment of the scan is continued for a preselected maximum time interval, but is quickly terminated if the count rate falls below a preselected low threshold value, and is terminated early if the count rate is relatively high, i.e., if the statistical error value associated with the count is relatively low. A technique is also disclosed for correcting the counting statistics when the sample being analyzed has a relatively short half-life and the radioactivity of the sample falls off at a relatively rapid rate.
REFERENCES:
patent: 3038078 (1962-06-01), Kern
patent: 3214700 (1965-10-01), Hook
Aime Clement P.
Horrocks Donald L.
Beckman Instruments Inc.
Dixon Harold A.
Meads R. R.
Shewmaker J. R.
Steinmeyer R. J.
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