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Neutron - Wikipedian a cascade known as a nuclear chain reaction.[8] These events and findings led to the first self-sustaining nuclear reactor (Chicago Pile-1, 1942) and the first nuclear weapon (Trinity, 1945). <span>Free neutrons, while not directly ionizing atoms, cause ionizing radiation. As such they can be a biological hazard, depending upon dose.[8] A small natural "neutron background" flux of free neutrons exists on Earth, caused by cosmic ray showers, and by the nat Summary
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