On Fri, Mar 11, 2016 at 4:33 PM, Stephen Cooke <[email protected]> wrote:
Once the metal atoms are excited into these high energy states, > particularly if the inner electrons are removed from their inner orbitals I > suppose further bremsstrahlung interactions of high energy electrons with > those atoms would no longer produce characteristic X-Ray's? At least until > the nuclei were no longer energised and able to de-excite back to their > ground level i.e. during cool down? > If there are electrons producing bremsstrahlung photons in the 100's of keV, as might have been seen in the recent MFMP gamma spectrum, presumably they would be exciting inner shell transitions as they are stopped. Nickel's K-shell electrons have binding energies of 8 keV [1], and so even a full transition will produce characteristic photons that are readily stopped by the kinds of materials that are being used for the Lugano/Parkhomov type reactors. Eric [1] http://www.chemistry.uoguelph.ca/educmat/atomdata/bindener/grp10num.htm
