Abstract
Some mixtures of 3He, neon, and methane have been investigated and found to have advantages as fillings for proportional counters to detect thermal neutrons. Recipes which were satisfactory in a counter with a 3.5‐in. diam include 15.7 psi of 3He+17 psi of neon+14 psi of methane and 1.0 psi of 3He+25 psi of neon+8 psi of methane.
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