Calculating Cs-137 Flux and Fall-Off at Various Heights in a 10 km Field

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A Cs-137 cloud deposits 100 Currie’s on farmer John’s field which is 10 km in diameter. What is the center line flux at one meter above the ground? Recalculate flux if you are 10 meters, 100 meters, and 1000 meters above the ground? How does the flux fall off as a function of distance?

One of my homework problems I'm not sure how to do. Can anybody help me? or start me off in the right direction
 
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Hi there,

You have to suppose a uniform surface deposition. From there, with a scheme of the situation, you should see that you need to simply integrate.

Cheers