Posted by **Lee** on Friday, April 25, 2008 at 8:09pm.

Why will the escape of neutrons be proportionally less in a large piece of fissionable material than in a smaller piece?

- Physics -
**Damon**, Friday, April 25, 2008 at 8:21pm
escape is through surface, proportional to length squared

volume generating neutrons is proportional to length cubed

so

ratio of escape to generation is proportional to 1/length, goes down as length goes up.

This is why babies get cold in cold weather or hot in hot weather quicker than adults.

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