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On Sun, Feb 16, 2020 at 10:54 AM, Dude wrote:

One could hardly call that a peak. This is going to need the x-ray source to see what’s there.

Dud

This was cool. It was still running in the Gamma Spec chamber on the CdTe (no external exciter) so I stopped that count, moved it over to the XRF chamber and did a scan there with X-Ray tube and Si-PIN. That didn't take long, now the sample is back in the CdTe Gamma Spec chamber with the counting resumed. It's se for 24 hours, and will be finished shortly.?

If anyone is familiar with CZT detectors (Cadmium-Zinc-Telluride), Amptek tried them for a short time a maybe 15 years ago. Their performance is excellent, but there were problems with the pulse shape ( I think). They soon switched to a better all around crystal, this one is just Cadmium-Telluride evidently.
That's what is in the one chamber, we call it CdTe. It has good performance but not as good as Si-PIN, however, the CdTe carries that good performance up to much higher energies. It has lost no sensitivity at 100 keV and is very usable at 200 keV, and will go up to 400 keV max with my setup.


In the XRF chamber is a Si-PIN detector, it is only to specs up to 25 keV and falls off the charts at 60 keV.

Both technologies together give make a good combination I think.

Now the XRF scan, note the scan time!

Also are attached 2 .mca, the 5 second one for fun and the serious 90 second one for hidden details.

Geo>K0FF

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