boron counter tube
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boron counter tube[′bȯ‚rän ‚kau̇nt·ər ‚tüb]
A counter tube filled with boron fluoride or having electrodes coated with boron or boron compounds; used for detecting slow neutrons.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.