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Novel Boron based multilayer thermal neutron detector

M. SCHIEBER1, O. KHAKHAN1, V.BEILIN1, E. MOJAEV1,* , M. ROTH1

Affiliation

  1. Department of Applied Physics, the Hebrew University of Jerusalem, Jerusalem 91904 Israel

Abstract

Thin layers of composite material, natural boron and boron carbide (B4C) with natural abundance of 10B, mixed with binder were used as thermal neutron convertors in a multilayer thermal neutron detector design. Plane metal electrodes of 4 -100 cm2 area were covered with thin (20-50 μm thick) layers of converter material and assembled in a 4-12 layers sandwich configuration, also with a pixel structure. High voltage was applied to metal electrodes to create in an interspacing electric field. The spacing volume could be filled with air, nitrogen or argon. Thermal neutrons were captured in converter layers due to the presence of 10B. The resulting nuclear reaction produced α-particles and 7 Li ions which ionized the gas in the spacing volume. Electron–ion pairs were collected by the field to create an electrical signal..

Keywords

Thermal neutrons, Boron carbide, 10B, Converter, pixel detector.

Submitted at: June 12, 2010
Accepted at: Aug. 12, 2010

Citation

M. SCHIEBER, O. KHAKHAN, V.BEILIN, E. MOJAEV, M. ROTH, Novel Boron based multilayer thermal neutron detector, Journal of Optoelectronics and Advanced Materials Vol. 12, Iss. 8, pp. 1811-1817 (2010)