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boron counter

boron detector
The alpha particle generated at B-10 during the nuclear reaction is used as proof of the neutrons
A boron counter is a detector, e.g. proportional counter tube, containing gaseous boron trifluoride (BF3), used to detect slow neutrons where the alpha particle generated in the chain reaction of the neutron with B-10 serves as proof of neutrons.

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Source: European Nuclear Society