Strong evidence of entanglement of X-Rays and Gamma rays in Bremsstrahlung can be
viewed in full action at the atomic level in the Java display available on the site
of the Physics department of the University of Colorado: http://www.colorado.edu/physics/2000/xray/making_xrays.html.
The emission of many X or gamma photons, quasi simultaneously, hence entangled,
is clearly depicted.