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Taray, Yes, it is slow. However, for complex scans with many peaks that are close together you will not be able to differentiate. How many Am241 buttons are you using? I use 4 and the most I have

Charles?I tried higher settings ,,but it becomes really slowI even tried playing with the peak time with no success?So I thought of continuing ?present settings for nowLonger counts is a good

Here is another scan of selenium supplement. It is stuffed with organic fillers including cellulose like the previous supplement My si pin displays low background But Compton scattering can hide some

Hi Taray, If you could let that run about 10x longer we would have enough counts to know for sure whether there is something else in addition to Fe. I would be interested in seeing that mca file

MikeIf I remember correctly,there was no change with bg.I do not have scaler Here is a repeat scan with si pinOnly show Fe ..no nickelI think it gives me a feel how the core of the earth is

Taray, Very interesting.? Did you get any rate over background in your shield?? Did you try with a scaler and a pancake? A statistical analysis might be required. I have read that meteorites have

That's a great suggestion Dudley, here you go:

Not in the normal gamma spec way of thinking but the low energy electronic system noise is a problem when using a short peaking time. And this is seen from 0 to about 2 keV. Dud

Given the tiny active volume of the Si-PIN detector, I wouldn't expect a significant background count, right? Randall

Mike when the newly created daughter sheds it's excess energy in the form of a photon when going to its ground state, it's that photon that sometimes creates the inner shell XRF that we see from

A Picture of the Trinity Blob on two Gamma Spec systems at one time. The silver box is the Amptek SDD-1-2-3 and the Ludlum Grey shielded probe is a Scionix 4mm thick cleaved crystal NaI(Tl) This

Geo, Interesting run. It does appear to have Fe, Cu, Pb and Zr and Rb/Y. The Y is hard to say as it has an interference with Rb and the count is too short to say much of anything as the peaks are

XRF of all-metal Trinity Debris. Again the oddball Trinity artifact, never having been in the melted sand by the looks of it. Without the neutron activation products, the fission product Gamma

You’ll be getting sum peaks (Ka + Ka and Ka +Kb) when the sample is a pure metal or would have a high concentration (% level) and you have a very high count rate (dead time 28%) due to a high flux

Some have asked about my large red and green Trinitite specimens. These 3 came to me at great cost from Steven L Kay, who was handling the sales for one of the original collectors on Trinity Site,

Now simply by reducing the beam KvP to the K-Edge plus ~3 keV, the scan is as good as the probe can make it. In this case we know it is silver, if you were searching for impurities or testing an

All correct. Here's a scan from today that was taken to illustrate another point concerning "Too-much-of-a good-thing-is-still-TOO-MUCH" Step one is to repeat a 50 kVp 10 uA run on pure Ag test

Got it, thanks will do.Geo

Geo, The purpose of the background runs was to compare the 4.8 to the 32 usec peaking time with changing nothing else – everything the same between the 2 runs. Set up the same, settings the same,

3600s Background Scan. Peaking time previously fine tuned to 4.8 us. No rad sources or Exciter sources. Shop made Amptek Si-PIN XR-100-CR flex-cable connected to Amptek DP-5/PC5 stack in a shop made