Neutron Flux in Infinite Vaccum

AI Thread Summary
The neutron flux for a point source is expressed as ø=S/(4πr^2), applicable in an infinite medium rather than a vacuum. The presence of an e^(-r/L) term indicates interactions with a medium, where L represents the mean free path. In a vacuum, there is no diffusion, leading to an infinite L value. The discussion highlights the need for clarity on the conditions under which the point source formula applies. Understanding these concepts is crucial for accurate neutron flux calculations.
chriskay301
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I have to figure out how to prove that the neutron flux for a point source is given by ø=\frac{S}{4πr^2}.

I can get this type of solution, but I have an e^(-r/L) in the numerator. I'm assuming I'm missing some theory somewhere as apparently this is the solution for a point source in an infinite medium, not vacuum.

does anyone have some insight they could offer?
 
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I realized there's no diffusion in a vacuum, therefore no diffusion coefficient. Please delete this post!
 
The exponential term comes from neutron interactions with the medium. For a vacuum, L is infinite.
 

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