- #1

eneacasucci

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- TL;DR Summary
- scattered radiation of photons when passing through a material

Consider a source emitting a beam of photons. These photons pass through x thickness of material. The attenuation coefficient of the beam \mu is known.

We can write this formula

If I'm not wrong, this formula tells us the number of photons that passed through the material of thickness x without interacting with it (
), but it does not tell us the "real" total number of photons that we should expect to see beyond this material (
) given by the sum of the first ones and the "scattered radiation".

My question is about

This is what I think about:

We can write this formula

If I'm not wrong, this formula tells us the number of photons that passed through the material of thickness x without interacting with it (

My question is about

**what do we mean with "scattered radiation"?**.This is what I think about:

**"scattered radiation" are the photons resulting from the interaction of the primary beam with matter, that can happen in these ways:**

1)photoelectric effect: with characteristic x-ray emission

2)Compton effect: in which the original photon loses energy, which is transferred to an electron

3)pair production: in which additional photons may be emitted if positron-electron annihilation occurs

4)coherent scattering: photon undergoes deflection but does not lose energy1)photoelectric effect: with characteristic x-ray emission

2)Compton effect: in which the original photon loses energy, which is transferred to an electron

3)pair production: in which additional photons may be emitted if positron-electron annihilation occurs

4)coherent scattering: photon undergoes deflection but does not lose energy

**Are these photons (1,2,3,4) the ones constituting the so-called "scattered radiation"? is there something else?**P.S. To get a correct estimate of the photons passing through the material, thus also considering scattered photons, I should add a correction term, how is it estimated?
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