Title :
Two-dimensional neutron scintillation detector with optimal gamma discrimination
Author :
Kanyo, M. ; Reinartz, R. ; Schelten, J. ; Müller, K.D.
Author_Institution :
Res. Center Julich GmbH, Germany
Abstract :
The gamma sensitivity of a two-dimensional scintillation neutron detector based on position-sensitive photomultipliers (Hamamatsu R2387 PM) has been minimized by a digital differential discrimination unit. Since the photomultiplier gain is position-dependent by ±25%, a discrimination unit was developed where digital upper and lower discrimination levels are set due to the position-dependent photomultiplier gain obtained from calibration measurements. With this method narrow discriminator windows can be used to reduce the gamma background drastically without affecting the neutron sensitivity of the detector. The new discrimination method and its performance as tested by neutron measurements are described. Experimental results on spatial resolution and gamma sensitivity are presented
Keywords :
gamma-ray detection and measurement; photomultipliers; scintillation counters; Hamamatsu R2387; differential discrimination unit; gamma background; gamma discrimination; gamma sensitivity; photomultiplier gain; position-sensitive photomultipliers; spatial resolution; two-dimensional scintillation neutron detector; Calibration; Gain measurement; Gamma ray detection; Gamma ray detectors; Neutrons; Photomultipliers; Position measurement; Position sensitive particle detectors; Scintillation counters; Solid scintillation detectors;
Conference_Titel :
Nuclear Science Symposium and Medical Imaging Conference, 1992., Conference Record of the 1992 IEEE
Conference_Location :
Orlando, FL
Print_ISBN :
0-7803-0884-0
DOI :
10.1109/NSSMIC.1992.301174
