Does the Compton effect only occur at a specific angle of incidence?

[physics user1]

Why is there a peak in intensity at the initial wavelenght? Does this mean thst there are photons reaching the relevator without being scattered? How? Do they hit the electrons?

I put a photo of the graph

 

[jtbell]

Does this mean thst there are photons reaching the relevator without being scattered?

I suppose that by "relevator" you mean "revelator" for which I think the proper English term is "detector"?

Yes, in general, not all of the photons that strike the target are scattered. How many are scattered, depends on the thickness of the target, and on the cross-section for Compton scattering at that wavelength (or energy).

 

[physics user1]

I suppose that by "relevator" you mean "revelator" for which I think the proper English term is "detector"?

Yes, in general, not all of the photons that strike the target are scattered. How many are scattered, depends on the thickness of the target, and on the cross-section for Compton scattering at that wavelength (or energy).

So... they just go throught the target, they don't interact with it, if so then we should get this additional peak only at theta = 0, because if photons comes from a direction, and they don't interact with the target, they should go on in that direction, without changing it, why then there are photons that don't interact at other angles? They should change direction only if they interact with the target, how can they don't interact but still change direction?