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Re: GEO-1-2-3 All-in-one low energy Si-PIN Spectrometer.

 

"?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 particular Si-PIN came alive. First test has run 24 hours, everything stable, using original calibration. Time to build the next one now. Further testing is scheduled.

24Hr stability test .png and .mca? attached.

Tomorrow a different new one.

Geo



----- Original Message -----
From: Dude <dfemer@...>
To: [email protected]
Sent: Tue, 23 Jun 2020 15:52:15 -0400 (EDT)
Subject: Re: [XRF] GEO-1-2-3 All-in-one low energy Si-PIN Spectrometer.


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 increase the electronic noise. Note
?the peaking time is set at 4.8 usec which is ok for a high count rate but you¡¯re
losing resolution and more importantly increasing the electronic noise. Try setting
that around 25 -32 usec for a low count rate Am source or a count rate below 10Kcps
and use a shaping time around 11 -14 usec. ?

Dud

?

From: [email protected]
[mailto:[email protected]] On Behalf Of GEOelectronics@...
Sent: Tuesday, June 23, 2020 6:01 AM
To: [email protected]
Subject: Re: [XRF] GEO-1-2-3 All-in-one low energy Si-PIN Spectrometer.

?

12 hours or so into the long term aging test. No noticeable
change in calibration at 5.9 keV, temperature stable etc. Heatsink warm to the
touch like a puppy.


15 seconds and the peak search function of software identifies the Fe-55 peak
with no problem. This is WITH? NO SHIELDING whatsoever on the sensor.



FYI- I? routinely run tests from 24 hours to weeks long for a single test,
with no downtime.


UsingAmptek? DPPMCA free software for control and display.



Geo






18757-First-24HR-Test-24Hr-in.mca
18757-First-24HR-Test-24Hr-in.mca
18757-24HR-Test-24Hr-in.png

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