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Re: Si-PIN Detector PEAKING-TIME-TEST


 

No not auto resetting LLD etc. I believe you must remove the source to do that. I'll include that on the way back down from 25.6 us which to my eye is the sweet spot.

This series is looking at gross differences among 4.8/9.6/19.2 and 25.6 us.

Geo



From: "DFEMER" <dfemer@...>
To: [email protected]
Sent: Thursday, October 22, 2020 12:12:14 PM
Subject: Re: [XRF] Si-PIN Detector PEAKING-TIME-TEST

Geo,

Did you auto reset the fast and slow thresholds for the 9.6 usec count? Note the input count well exceeds your total count meaning there is still a lot of low energy noise that needs to be taken care of. Going to the lower 4.8 usec is going to make matters worse in resolution and noise. A 2048 conversion gain is the sweet spot. Use shorter peaking time for high count rate, longer for low count rate and better resolution. But you need do need to reset your filters when you change parameters.

Dud

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From: [email protected] [mailto:[email protected]] On Behalf Of Charles David Young
Sent: Thursday, October 22, 2020 8:34 AM
To: XRF
Subject: Re: [XRF] Si-PIN Detector PEAKING-TIME-TEST

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Geo,

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Doubling the # channels gives you better definition as well.? Could you do a test with 2048 channels and 4.8 uS peak time?? If you provide both mca files they could be compared.

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Charles

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On Thu, Oct 22, 2020 at 7:40 AM <GEOelectronics@...> wrote:

First real run with a longer peaking time, nearly everything else the same.
This is U L X-Rays, one of my current interests.
To my eye, the peaks are taller for the same test-time and maybe a little better defined. For sure the PEAK-SEARCH routine likes the change and can identify the peaks with no hesitation. To take advantage of the better resolution from the longer peak time (9.6us vs 4.8 for previous tests), the # of channels was doubled to 2k.

Geo

U_L-X-Rays-Si-PIN_9.6usPT-22OCT2020_53ks.png


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