SCINTILLATION DETECTOR FOR FAST AND THERMAL NEUTRONS

摘要

FIELD: dosimetry of fast and thermal neutrons and gamma radiation.;SUBSTANCE: proposed scintillation detector is intended for using in the radiation monitoring systems for fissile material detection (uranium, plutonium, californium and articles from them). The scintillation detector consists of transducer and unit for electron processing of signals. The transducer consists of two scintillators, fulfilled in the form of plates with plane-parallel and touched faces, being in the optical contact. The scintillators are located in the single case. The first (plastic) scintillator is fabricated in the form of a wedge from organic hydrogen-containing material, selectively sensitive to fast neutrons, which causes the light scintillations owing to recoil protons. This scintillators is intended for fast neutron detection. The second (glass) scintillator is fabricated from the 6Li silicate glass and is intended for thermal neutron detection. Both scintillators are equipped with light-resetting film and forms a single sensory scintiunit. The scintiunit is equipped with a lead collimator and is located together with the last in a polyethylene box-storage. The transducer has also a photoelectric multiplier, installed at the end face of the plastic scintillator. The photoelectric multiplier signals are applied at the unit of electron signal processing. This unit ensures counting of the number of pulses, induced by scintillations in both scintillators.;EFFECT: increased efficiency of detection of both fast neutrons, and thermal ones.;1 cl, 1 dwg