Berlin 2015 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 36: Poster Session I
DS 36.53: Poster
Donnerstag, 19. März 2015, 09:30–12:00, Poster A
Boron carbide coatings for neutron detection probed by x-rays, ions, and neutrons — •Gregor Nowak1, Michael Störmer1, Hans-Werner Becker2, Christian Horstmann1, Reinhard Kampmann1, Daniel Höche1, Martin Haese-Seiller1, Jean-Francois Moulin1, Christian Randau3, Uwe Lorenz1, Richard Hall-Wilton4, Martin Müller1, and Andreas Schreyer1 — 1Helmholtz-Zentrum Geesthacht, 21502 Geesthacht, Germany — 2RUBION - Zentrale Einrichtung für Ionenstrahlen und Radionuklide, Ruhr-Universität Bochum, 44780 Bochum, Germany — 3Georg-August Universität Göttingen, 37077 Göttingen, Germany — 4European Spallation Source ESS AB, 221 00 Lund, Sweden
Due to the present shortage of 3He, the supply of large neutron detection systems becomes unaffordable. Alternative neutron detection concepts based on solid 10B are envisaged and require development in thin film deposition techniques regarding high adhesion, thickness uniformity and chemical purity of the converter coating. We report on the sputter deposition of precise 10B4C coatings of up to several microns thickness on Al substrates using the HZG large area sputtering system. Complementary film analysis using x-rays, ions, and neutrons reveal a high quality 10B4C coating. Especially XPS, SIMS, and RBS show low chemical impurities concentrations in the coatings. The isotope composition determined by SIMS, RBS evidences a very high 10B isotope content. Neutron detection test measurements demonstrate an average relative quantum efficiency ranging from 65 % to 90 % for cold neutrons as compared to a black 3He-monitor.