Title: Method of compensating for quenching effect of substance contained in a sample gas the radioactivity of which is to be measured by a radioactivity detector and apparatus for performing the same

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Abstract: A first and a second radioactivity detectors are used in series or in parallel which have substantially the same constructive features and the second radioactivity detector includes a fixed standard radioactive source therein. Sample gases each having a common radioactivity and having a different quenching effect are passed through the two radioactivity detectors sequentially to measure the effective radioactivities thereof to thereby obtain counting efficiencies of the two radioactivity detectors. A correction curve is drawn by putting the counting efficiency of the first radioactive detector along one axis of an orthogonal coordinates and the counting efficiency of the second radioactivity detector along the other axis of the coordinates. An unknown sample is treated in the same manner as the above to obtain the counting efficiency of the second detector for the unknown sample and a corresponding counting efficiency of the first radioactivity detector is obtained from the correction curve by the last counting efficiency of the second radioactivity detector. The quenching effect of the unknown sample is compensated for by using the corresponding counting efficiency of the first radioactivity detector.


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