PROCESS OF RADIATION MONITORING OF RAW MATERIALS IN VEHICLES AND DEVICE FOR ITS REALIZATION Russian patent published in 1999 - IPC

FIELD: radiation monitoring of raw materials, ore, scrap arriving in vehicles. SUBSTANCE: signal proportional to difference of signals of detectors is recorded while loaded vehicle passes between two radiation detectors. Difference signal goes to threshold elements having positive or negative operation thresholds. Operation of one of threshold elements activates signalization unit that registers presence of radioactive source in vehicle. There are provided differentiation of difference signal and recording of transition of derivative of this signal through zero. Device for realization of process of radiation monitoring incorporates two radiation detectors positioned uniaxially, two ratemeters, unit setting operation threshold, threshold elements, transmitter of presence, signalization unit, unit measuring difference of signals, differentiation and coincidence circuits. One of threshold elements has positive and the other one negative operation thresholds with reference to zero level. EFFECT: decreased probability of admission of radioactive materials to plant in the form of local sources located in the bulk of load with simultaneous reduction of effect of parameters of vehicle and load and, in consequence, prevention of radiation accidents. 4 cl, 9 dwg