Radiant energy – Automatic/serial detection of similar sources
Patent
1972-05-03
1977-06-14
Borchelt, Archie R.
Radiant energy
Automatic/serial detection of similar sources
250369, G01T 120
Patent
active
040294013
ABSTRACT:
A method is provided for automatically compensating liquid scintillation systems for efficiently counting samples of varying quench by establishing the amount of change of a system parameter such as gain required to restore the sample spectrum to be counted in at least one counting window to the proper counting window discriminator levels as a non-linear function of the change in a measure of quench. The degree of quench may be measured on each of the samples prior to counting, for instance by the external-standard channels-ratio method, and the system parameter automatically adjusted to restore the spectrum to the proper window or windows. Implementing circuitry shown includes a digital-to-analog converter and non-linear network which can be calibrated by using the endpoint of a known least quenched sample to establish the base gain and a reference standard and using a known, highly quenched sample to establish another point on the gain vs. external-standard curve to establish the slope, so that when the external-standard ratio is set into it the amount of gain restoration required appears as an output.
REFERENCES:
patent: 3721824 (1973-03-01), Bristol
Beckman Instruments Inc.
Borchelt Archie R.
Meads R. R.
Steinmeyer R. J.
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