link to lecture transcript - UT-H GSBS Medical Physics Class Site

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If we want to calculate the total cross section, hence the attenuation coefficient, we have to integrate over angles. The integration is rather messy. I am not going to integrate this for you as we can spend a couple of days doing the integration; I’d rather not do it. Th The bottom b tt line li is i that th t we still till have h this thi ¾ σ0, which hihi is what htwe had hdf from the thlinear li attenuation coefficient times a horrendous quantity that has a very complicated energy dependence. 12
If we plot the energy transfer coefficient as a function of energy, this is what we get. Notice that, unlike the linear attenuation coefficient, the energy transfer coefficient is suppressed at low energies. 13
Page 1 and 2: Today, we continue our talk about C
Page 3 and 4: We previously derived an equation f
Page 5 and 6: So σ 0 is the classical cross sect
Page 7 and 8: Let’s look at this graph. Notice
Page 9 and 10: What about the dependence of the Co
Page 11: The energy transferred to the elect
Page 15 and 16: The energy transfer coefficient has
Page 17 and 18: What about the scatter coefficient?
Page 19 and 20: Using this equation we can now plot
Page 21 and 22: This probability is represented by
Page 23 and 24: This figure is a plot taken from Jo
Page 25 and 26: We can always calculate what the ma
Page 27 and 28: Remember dσ/dE is relatively const
Page 29 and 30: Now we also look at the graph and s
Page 31 and 32: First, let’s recall that the atte
Page 33 and 34: What we now want to find out is how
Page 35 and 36: So far, our approximations have bee
Page 37 and 38: These values were tabulated by Hubb
Page 39 and 40: So what is the effect of binding en
Page 41 and 42: At higher energies there is no diff
Page 43 and 44: Note that this graph is for very lo
Page 45: The fraction of energy transferred

link to lecture transcript - UT-H GSBS Medical Physics Class Site

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