Find the ratio of alpha particles scattering at any angle

skiboka33
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I'm working on a problem in which I'm asked to find the ratio of alpha particles scattering at any angle (assuming equal numbers of scattering nuclei per unit area)

now I realize that nt = scattering nuclie per unit area. Does this mean that the above restriction sets nt to 1? Wondering because I have the information to find n (atoms/volume) but there is not thickness, t given in the problem. I'm a little new to this material so any help would be appreciated. Thanks.
 
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Since you are asked to find a ratio, nt should cancel in your final answer.
 
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