Detector Electronics Corporation

Stanley S Kintigh

Theodore E Larsen

Improved circuitry or systems for the continual testing of the ability of a radiation detection system to detect radiation whether the radiation source being used for the testing is located externally to or is located within the same housing as the radiation detector. The improvement includes means for maintaining a constant voltage upon a control member which means provides accomodation for random or spurious radiation by controlled excitation of a radiation source which provides means for monitoring this radiation source for automatically determining the operational condition of the radiation detector.

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Hopkins, MN, United States of America

Stanley S Kintigh