counter tube containing a lining of fissionable material designed to detect thermal and fast neutrons
Note 1 to entry: The initial ionization is caused mainly by fission fragments produced by nuclear reactions of neutrons with the lining. Note 2 to entry: Typical lining materials are 235U and 238U. Note 3 to entry: This entry was numbered 394-29-11 in IEC 60050-394:2007.
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