Liquid scintillation counter for measuring the activity of radio

Details Liquid scintillation counter for measuring the activity of radio Liquid scintillation counter for measuring the activity of radio

1988-11-22

1990-04-17

Fields, Carolyn E.

Radiant energy

Automatic/serial detection of similar sources

250362, 250364, G01T 1204

Patent

active

049183109

ABSTRACT:
In a liquid scintillation counter the light output from a liquid scintillation sample containing radioactive isotopes of unknown activity is measured by means of a detector. A pulse height analyzer having discriminators that are combined to define pulse height windows, is connected to the detector for measuring and temporarily storing count rates for each of the windows. Moreover, there are means for determining a value for the quench level of the sample. According to the invention the number of pulse height windows is at least N+1, when the number of isotopes is N,N being .gtoreq.2. There are memory means for storing for each of said windows representations of counting intensities determined by measuring calibration samples of each isotope at different levels of quench. Moreover, there are means for extracting from said stored representations a counting intensity for each window and each isotope on the basis of said determined quench level value, and means for determining for each isotope a factor by which the extracted counting intensities are to be multiplied in order to fit the sum of the extracted counting intensities to the count rates measured for the sample in each window, each said factor being directly related to the amount of each isotope in the sample.

REFERENCES:
patent: 3610928 (1971-10-01), Thomas
patent: 4628205 (1986-12-01), van Cauter et al.

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