Romulus, if you don't present numbers, you aren't answering the questions. Science really does work that way.
More than that, the numbers must be put into proper context. The graph he shows for x-rays give the influx energy in two overlapping bands, specified by wavelength. The photon energy is derived from wavelength according to a simple formula, and expressed in electron volts. The particle energy in electron volts can then be used in his attenuation coefficient graph to determine how much aluminum will block x-rays
of that particular energy.
30,000 electron volts is sufficient for a mammogram. More invasive diagnostic medical x-rays approach 70-80 thousand electron volts. Airport security is typically up in the 100,00 electron-volt range. Medical x-rays do not penetrate much into metal objects such as plates, screws, and other mechanisms -- they show up as white silhouettes.
Groves bombarded his film with 8
million electron volts. Romulus is trying to tell us the difference between a few ten-thousands of electron volts and a few million electron volts is negligible.
If you look at his graph, the longer wavelengths deposit more energy. The longer wavelengths are the lower-energy ones (fewer electron volts). Why do they deposit more energy? Because there are many, many times more of them. Their aggregate effect is much greater, and so they deposit more energy on the detector. But why wouldn't that deposited energy affect film? Because the graphs are of energy deposited on the
surface of the detector, which works like a CCD. It takes more electron volts to penetrate the film magazine case, and the vast number of solar x-ray photons (typically < 20 keV during quiescence) lack the energy to do that.