HIGH-SENSITIVITY/LARGE-AREA SCINTILLATION DETECTOR

PURPOSE:To rapidly and accurately detect radioactivity from a wide measurement range with a high sensitivity by expanding a total effective area by aligning scintillators with a certain effective area adjacently in parallel and at the same time adding the detection signals of the adjacent scintillators. CONSTITUTION:Scintillators C1-C5 with a certain effective area A are laid out adjacently with the incidence surface being aligned and an emission phenomenon by the radioactive rays of the scintillators C1-C5 is detected individually by photomultipliers P1-P5 and is converted into an electrical signal, is multiplied, and is output. With this configuration, even if, for example, radioactive rays from a radioactive contamination surface Q with 100cps at a boundary region are measured for 70cps and 30cps by the scintillators C2 and C3, respectively, they are added by an addition circuit S2 and are outputted as a signal with 100cps, thus accurately detecting signals. Since the number of scintillators C can be increased, a total effective area can be freely increased and the detection sensitivity of a detector constituted by two scintillators C does not decrease to 3X(2Nb) or less.