Method with Digital Signal Processing for Increasing the Efficiency of Thermal Neutron Detection by a Scintillation Detector Based on a Screen and Wavelength-Shifting Fibers

• Published in: Physics of particles and nuclei letters Vol. 21; no. 2; pp. 146 - 153
• Main Authors: Podlesny, M. M., Kruglov, V. V., Bodnarchuk, V. I., Milkov, V. M., Bogdzel, A. A.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 2024; Springer Nature B.V
• Subjects: Digital signal processing; Methods of Physical Experiment; Optical fibers; Particle and Nuclear Physics; Photoelectrons; Physics; Physics and Astronomy; Scintillation; Scintillation counters; Thermal neutrons
• ISSN: 1547-4771; 1531-8567
• DOI: 10.1134/S1547477124020109

The results of studying neutron signals from scintillation detectors based on a screen and wavelength-shifting fibers are presented. It is shown that the complex shape of the neutron signals arises from a low signal amplitude and fluctuation of photoelectrons in the process of light collection from the scintillator surface using optical fibers. A charge method for neutron detection using digital signal processing is proposed, which allows an appreciable increase in the detector efficiency at a high counting rate. The calculated efficiency of neutron signal discrimination at a neutron event intensity of ( n/s) is ε = 0.42. To compare, the efficiency of the classical discrimination method with nonparalyzable dead time is ε = 0.33.