In earlier experiments (see Cd FAIL!) we gained information and data about how a cadmium (Cd) filter inserted into the exciter beam altered the output of that beam.
That allowed this experiment to use the altered output spectra for a specific purpose.
A similar experiment has been on the back burner for a long time, specifically pointing the source, not at the intended target but an intermediate target, then using the rays excited from that target to excite the target to be analyzed. Up to 2 intermediate targets or crystals have been used in published experiments. Getting all that set up in my counting room would be impossible, due to the space required and the precision geometries needed. Not to mention my setup is not conducive for reflection geometries.
Instead we investigated a transmission type filter (source filter) and learned form those experiments that a cadmium filter would seemingly pass through the Cd K lines at ~23 and ~26
pretty well, and block most everything else. The intention was to see if those monochromatic X-Rays would excited the intended target's K line XRF.
It worked so well, I had to run the same test with the Ge removed to make sure I wasn't chasing a ghost. Both .mcas attached.
Geo
