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Make sure we get two coats of wax on there Biff! Looks great, thank you for setting these up for us!

#4 and #5 finished. That's the end of that particular project. One spinoff was a remount of the DP5 stack used to power and control the Si-PIN in my X-Ray tube XRF shield, into a GEO-123 style box.

Geo, There are no E cal file parameters in there. Peaks could be anything Dud Sent: Friday, June 26, 2020 3:08 PM To: [email protected] Subject: Re: [XRF] GEO-1-2-3 All-in-one low energy Si-PIN

#3 is s/n 18812, again no surprises (yawn). 2 more to go. Geo

#2, s/n 19012 43 hours continuous, no drift. Display showing sensitivity to 1-70 keV on the screen, one is linear, the other is log. Software provides a 3rd display called SQRT for Square Root. Seems

will do Dud.. Geo To: "XRF" <[email protected]> Sent: Wednesday, June 24, 2020 11:03:47 PM Subject: Re: [XRF] GEO-1-2-3 All-in-one low energy Si-PIN Spectrometer. Looks much better than the

No surprisesAm-241, ,#19012? after 16 HR into 24HR test. This is pretty routine now, the sensors and electronics were all tested pre Covid-19 and stored. Geo

Understood about collimator. For your research, the AMPTEK sensor used in these are new, factory packaged model AXRCR Detector, 25mm^2, 1 mil (not mm) beryllium window with matched PA230

Looks much better than the first one. Try setting up 18757. Dud Sent: Wednesday, June 24, 2020 1:51 PM To: [email protected] Subject: Re: [XRF] GEO-1-2-3 All-in-one low energy Si-PIN Spectrometer.

Most of Amptek’s detectors contain internal collimators to improve spectral quality. X-rays interacting near the edges of the active volume of the detector may produce small pulses due to partial

Internal to??

Geo Any internal collimators? Will help cut down small peak. Taray

The second one is serial 1`9012, was set up from the factory so left it alone. Looks fine. Geo

#2 in this series, or as the song says "Second verse, same as the first". Geo

" Was 130 the optimal set point for that detector?" You are right, the one I normally running my Home Lab is set to 190V.This is a brand new one for a friend, it is the minimum HV where this

Geo, Is there a reason you’re running the HV at 130v. Most Si Pins should run around 150 to 200. Was 130 the optimal set point for that detector? A low voltage will increase the capacitance and

that's then latest aluminum version, the brass was great but had bothersome self-excited copper/zinc line. It's just a mtter of time. Coffee break over, back to the shop now.... Geo To:

I would buy one without the Am241 buttons as well. charlesdavidyoung@...> wrote:

George, If you are selling those rapcaps I want one! Charles

A good question deserves a good answer! The RAPCAP LIVES !! See pics. Geo To: "XRF" <[email protected]> Sent: Tuesday, June 23, 2020 9:25:38 AM Subject: Re: [XRF] GEO-1-2-3 All-in-one low