G - Physics – 01 – N
Patent
G - Physics
01
N
354/22
G01N 15/00 (2006.01) A61B 5/00 (2006.01) G01N 15/12 (2006.01)
Patent
CA 1196722
INVENTORS: MARKUS FEIER and ULRICH MARTI INVENTION: METHOD AND APPARATUS FOR CORRECTING COINCIDENCE ERRORS DURING COUNTING OF TWO TYPES OF PARTICLES ABSTRACT OF THE DISCLOSURE During a predetermined measuring time there are generated electrical pulses in a detector arrangement, each of these electrical pulses corresponding to a respective particle which is to be counted. The pulse amplitude of the electrical pulses corresponds to the particle size. In a discriminator circuit the electrical pulses are compared with a threshold value. Those pulses, the pulse amplitude of which exceeds the threshold value, are inputted to a counter circuit and a time measuring circuit for measuring the total time duration of the electrical pulses. All of the electrical pulses are delivered to a further counter circuit and a time measuring circuit. The digital values derived from both counter circuits and both time measuring circuits are infed to a digital computer in which there is computed according to the equation Image = (ZS - ZE) TS/(TS - TE) a count result Image for the pulses, the pulse amplitude of which does not exceed the threshold value. This count result Image has been corrected by the cross-coincidence error. - 2 -
433818
Feier Markus
Marti Ulrich
Contraves Ag
Johnson & Hicks
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