Where Does the l22 Term in the Fluence Rate Numerator Come From?

AI Thread Summary
The discussion centers on the origin of the l22 term in the fluence rate numerator related to photon scattering and transfer. The poster successfully calculated the fluence of scattered photons but struggled with transferred photons. The solution sheet indicates that the fluence rate includes an l22 term, which is derived from the distance relationships in the setup. Specifically, the fluence rate at distance l3 from the source can be expressed in terms of the fluence rate at the graphite cylinder (l1 = l2) and the distances l2 and l3. Understanding these relationships is crucial for accurately determining the fluence rates in this context.
Graham87
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I managed to calculate the fluence of the scattered photons. However, not the transferred photons. In the solution sheet the fluence rate has an l22 in the numerator in the end of the solution sheet. Where does that come from?

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Graham87 said:
I managed to calculate the fluence of the scattered photons. However, not the transferred photons. In the solution sheet the fluence rate has an l22 in the numerator in the end of the solution sheet. Where does that come from?
Note that ##\dot \varphi_0## is defined to be the fluence rate at the position of the graphite cylinder, which is at a distance ##l_1 = l_2## from the source. Thus, what would be the fluence rate at a distance of ##l_3## from the source, expressed in terms of ##\dot \varphi_0##, ##l_2##, and ##l_3##, assuming no lead shield?
 
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