Interaction of particles in a Thin Slice matter

[KatyLee]

I am trying to find more information on the above subject. Can anyone point me in the right direction?
Also: What formula do you use to work out the volume of the material?
Any help, greatly appreciated

 

[Haelfix]

Can you be a little more specific? Set up the problem that you want help with in detail and maybe we can help.

 

[KatyLee]

Sure... sorry that was a bit vague.
I'm studying radiation physics, and finding the study material a bit vague.
Given factors for the problem: 10 molecules exist in a thin sheet of material that is 0.1 micrometers thick, and has a facial area of 1micrometer by micrometer square. calculate the volume of the material, and number of molecules per cubic meter and cross section (area) of each molecule. I have 2 physics textbooks, and neither have much in them.