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I agree, and we can't expect anything below ~2keV in air, but what this shows me is with a helium atmosphere, we could have a shot at down to 1. I tried propane (once) and it changed things, bit of

Great idea on the reverse-osmosis water discharge!Test everything!Here's another great idea for collecting samples from water, a paper by "A Sensitive XRF Screening Method for Lead in Drinking

It just looks like noise to me. I would have to see a lot more counts and reproducible runs to believe it. Charles

forgot the picture:

Ok your 4.8us. Yes I ran that too for a long time. Here's an expanded look at the lowest energy end of that scan, with pretty arrows to point out the lowest fully resolved peak (although there is

I have always used 4.8uS peak time. Can you show why you think you are resolving individual peaks down to less than 1.5 keV? Charles

Hi guys I am interested in drinking water quality testing and most drinking water test kits are not accurate. They give positive readings on concentrated samples like sewage and not for trace elements

After running the 19.2us peaking time and being satisfied with the tweaking and calibration, here are the results from a and overnight U L X-Ray test and for comparison an old similar test on the same

Thanks for that report Charles. Of the two, can you say what is the lowest peak that can be resolved and is there a difference between them? My just finished overnight run using the Si-PIN on a

I did 2 runs on a brannerite specimen. One like normal (red) and the other with a paper adhesive label covering the buttons. The proportions of the peaks pretty much look the same to me. Charles

Ok, thanks for the Na response. Next? gas proportional counter in a He atmosphere? I'll take some with me in the shower,that should be enlightening. Randall

A nice tutorial link on the subject: http://xrf.guru/Concepts/FilterAndVoltage/index.html and another from Bruker, the XRF gun

Kovar alloy, 1 mil thick Cd filter on source beam 40kVp @ 40uA Kovar is 54% Fe 17% Co 29% Ni Pic and .mca Try this on your non silicon, room temp? probe?? Thanks to member Wally C. for exotic

Just pics for now, Ni-Fe-Mo alloy stamp/

Might as well add the spectrum from the earlier test showing what the modified beam looks like after passing through the Cd filter- exciter was? 1 Am button Also just now Mo stamp (pure metal)

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

5 seconds that is. K-edge filter applied to bottom of wooden jig. Jig and pure tin sample placed in chamber Scanned for 5 seconds 50kVp @ 10 microAmperes.(the beam enters through shielded port in

Na Na NA! Ne'er Do Well

Randall, Wow that’s going to be tough. #1 it has a Ka of only 1.04 keV with a 1 4% yield and # 2 its behind glass sucking up that 1.04. I can't say I've ever seen anything below Al and Al is tough

Thanks for the offer Randall, but Na. Geo