link to lecture transcript - UT-H GSBS Medical Physics Class Site
link to lecture transcript - UT-H GSBS Medical Physics Class Site
link to lecture transcript - UT-H GSBS Medical Physics Class Site
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So what is the effect of binding energy? Here is a plot of Comp<strong>to</strong>n coefficients<br />
versus pho<strong>to</strong>n energy for a free electron gas, oxygen, and lead. We see the curve<br />
for the free electron gas on <strong>to</strong>p; below that is the curve for oxygen; the lowest<br />
values are for lead.<br />
First of all, notice the binding energy only has an effect on the Comp<strong>to</strong>n coefficient<br />
at low energies; once you get above 100 keV, the binding energy essentially has no<br />
effect.<br />
Binding energy is more important for higher Z materials. This also makes sense.<br />
So the impact of binding energy on Comp<strong>to</strong>n coefficient is most noticeable for high-<br />
Z materials.<br />
In general, if we look at energies where the Comp<strong>to</strong>n effect is the predominant<br />
interaction, the effect of binding energy is not significant.<br />
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