The discussion centers on the origin of the term l22 in the numerator of the fluence rate equation for scattered and transferred photons. The fluence rate, denoted as ##\dot \varphi_0##, is defined at the position of the graphite cylinder, located at a distance of ##l_1 = l_2## from the source. The inquiry seeks to express the fluence rate at a distance of ##l_3## from the source in terms of ##\dot \varphi_0##, ##l_2##, and ##l_3##, without the influence of a lead shield. Understanding this relationship is crucial for accurate calculations in photon scattering scenarios.
PREREQUISITESPhysicists, engineers, and researchers involved in radiation transport, particularly those working with photon scattering and fluence calculations.
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?Graham87 said: