The mobile version of BNS-94 Radiation Control Gate was developed by Gamma Technical Corporation to serve as a high-sensitivity device for reconnaissance gamma contamination. The detector of the BNS-94M 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 optionally connected computer receives data from the detectors in every half seconds then calculates the actual alteration from the average background level. If the difference exceeds the preset value the alarm goes off.