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The BNS94H Radiation Control Gate was developed by Gamma Technical Corporation to serve as a highsensitivity device for reconnaissance and testing natural and artificial radiation sources. The detector of the BNS94H Radiation Control Gate is a scintillation probe with high sensitivity for gamma radiation. A patented measurement method assures background, shielding and speed compensation in one single detector. The connected computer receives the data from the detector units in every half seconds then calculates the actual alteration from the average background level. If the difference exceeds the preset value then the alarm goes off and the event gets registered into a log file.