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Schematic diagram of a fission chain reaction. Based roughly on the illustration in the Smyth Report (1945). Image File history File links Commons-logo. ...
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English:
A uranium-235 atom absorbs a neutron, and fissions into two new atoms (fission fragments), releasing three new neutrons and some binding energy.
One of those neutrons is absorbed by an atom of uranium-238, and does not continue the reaction. Another neutron is simply lost and does not collide with anything, also not continuing the reaction. However one neutron does collide with an atom of uranium-235, which then fissions and releases two neutrons and some binding energy.
Both of those neutrons collide with uranium-235 atoms, each of which fission and release between one and three neutrons, and so on.
Use of this work which I have created is allowed under the terms of the CC-BY-SA license (see below). Credit must be given to "Wikimedia Commons." You can contact me if you would like to negotiate other licensing terms (which I am generally happy to do). Those who wish to use this in the course of teaching may do so without any limitations. --Fastfission
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