NUC K117 Chapter Notes - Chapter 9: Electronvolt, Thermalisation
7 Feb 2019
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Fast neutrons: free neutrons with an energy of 1mev are considered fast". Fission neutrons are born at an average energy of 2 mev (some higher; some lower: thermal neutrons, free neutrons with an energy level of about . 025 ev are considered at. 1 slow by scattering (collisions) with moderator and other atoms. Hydrogenous material (like water) very e ective in slowing down process. Fuel absorption: thermal neutrons absorbed by fuel cause additional ssions - the desirable end use. Structural/poison absorption: some thermal neutrons are absorbed in plant structural materials, or poisons like control rods or boric acid. Leakage: some neutrons (fast and slow) leak out of the core and reactor vessel completely. A few are detected by instruments for measuring reactor power.
