"Fred Chen" <flipsu5@comcast.net> wrote in message
news:1106078296.682399.302220@f14g2000cwb.googlegroups.com...

Hi,

Was wondering if anyone knew a good reference for any studies on
Compton scattering of X-rays (<1keV) from photoelectrons generated

the X-rays. A photon could Compton scatter off a photoelectron
generated by another photon. This effect should be small, but is

any quantitative results from theory or Monte Carlo simulation like
PENELOPE?

Thanks in advance,
Fred

The effect is "small" because the photo-electron density
would normally be small. Landau & Lifshitz give the
cross-sections for Compton scattering and for the photo-
electric effect.

The cross-sections, X, WRT to photon energy, E, have
the following proportionalities:

X_ccompton ~ (r_e)^2 [ 1 - E / (m_e * c^2) ]

X_photo ~ [ (a_0)^2 * Z^5 ] [ I / E ]^(3.5)

High Z material with photon energy just above the Ionization
potential, I, would yield the largest possible cross section.

[Old Man]