I wrote: I think Mills also mentioned soft x-rays early on, which are in the low > keV. And the spectrum he spent time discussing had an endpoint somewhere > above 100 eV. Such photons would presumably come from the excitation of > inner shell electrons in heavier elements such as silver. >
I recall that the photons were mostly broadband, while emissions from de-excitation of inner shell electrons would be characteristic (sharp). So if the broadband spectra went back to energetic beta electrons, perhaps they were due to bremsstrahlung instead. Eric
