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The detection of neutrons with thin 6Li containing films or layers within an ionization chamber is discussed. A detection efficiency of 50% for thermal neutrons is obtainable with three 100-μm thin 6Li foils. Preliminary measurements were performed with converters which contain a 1-μm thin 6LiF layer. The detector efficiency is only 3%. Pulse height distributions were measured and analyzed for the gases Ar, CF4, and C2F6 at pressures between 0.5 and 5 atm and at voltages between 50 and 500 V. Diffraction peaks from polycrystalline iron and semi-crystalline pyrolytic graphite were measured in TOF mode and are presented.
Date of Publication: Oct. 2004