Assertion: decay's neutron | /r/CapableOf | average about 2.4 neutrons per event
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text: But the only naturally occurring isotope in which fission can be induced with thermal neutrons is Uranium-235 which splits into Barium-141, a soft silvery metal, and Krypton-92, an inert gas, and surplus free neutrons averaging about 2.4 neutrons per event.