A test for ensuring that the fluorescent photon cutoff works. A monoenergetic
source of 0.015keV is placed within a thin Ti sphere and photon counts are
scored on the outer surface of the sphere. Normally there would be a
fluorescent peak at ~4.5keV so when the `fluorescent photon cutoff` setting is
set to 0.005 MeV that peak should not be present.
Two energy bins from 0-10keV and 10-20keV are used. If fluorescent photon cutoff
feature is working correctly 100% of photons should be in the 10-20keV range.