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In a nuclear fission reactor how is the neutron fired at the U-235?

How is a neutron shoot into the fuel rod of a fission reactor.

Tombini7 years ago
In a U-235 reactor, the deacy chain looks like this;
http://en.wikipedia.org/wiki/File:Nuclear_fission.svg
Basically; 1N + U-235 = Ba-141 + Kr-92
The neutron has to be a slow neutron for the U-235 nucleus to absorb it properly so many reactors around the world use mediums such as light water (normal H2O) heavy water (deuterium based H2O) and graphite (that lovely allotrope of carbon)
These mediums are used to slow the fast neutrons
To actualy get a slow neutron just find something that emits it

Hope this helps