Assertion: atom's neutron | /r/CapableOf | pass into the chamber
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text: In the Geiger counter, alpha particles trigger a response, whereas neutrons do not; hence, if the gas chamber of a Geiger counter is filled with a gaseous boron derivative (e.g., boron trifluoride), the counter will record each alpha particle produced when a neutron that passes into the chamber is captured by a boron-10 nucleus.