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Re: 2020 Portable X-Ray Tube XRF Outfit.Sensor Port Upgrades

 

"I think the shield from a liquid scint counter I parted out will work for this with some work. "

No doubt, we did learn the lining (passivation layer) is nearly as important as the safety shielding.

Nothing wrong w LN2 if you lie in/near a city and can get it delivered. I hear Carl W. transports it in the trunk of his car (not recommended).

Great on the Kevex, now look at the THERMO power supplies, some as low as $30, and will handle an SDD. If it's a Si-PIN, then the DP-5 should work with it. My SDD is another brand, and won't work with DP-5 (yet- it should when the DP5 is set up as a stand alone MCA). SDD uses high voltage of opposite polarity from Si-PIN.

DP-5 stacks marked Si-PIN will drive the SI-PIN with its own preamp nothing else needed. For use with other detectors, the PC5 isn't used, just the DP5 which must be configured as a stand alone MCA, but there is no preamp in in the DP5.

Geo

----- Original Message -----
From: Nick Andrews <nickjandrews@...>
To: [email protected]
Sent: Fri, 07 Feb 2020 10:48:29 -0500 (EST)
Subject: Re: [XRF] 2020 Portable X-Ray Tube XRF Outfit.Sensor Port Upgrades

Cool.? ?I think the shield from a liquid scint counter I parted out will work for this with some work. While I can foresee moving to a more modern (no LN2 needed) detector than the HPGe, I did buy the thing so I might as well play with it. If it works.?

I did pick up that Kevex fan cooled detector for $200?and that should be interesting to try. It arrives Monday.?

On the Amptek board stacks.? ?What's the consensus on value??

On Thu, Feb 6, 2020, 1:55 PM <GEOelectronics@...> wrote:
The inner aluminum layer is held in place inside the lead layer by a threaded pipe. The length of that pipe limits the insertion depth when that hole is used for the sensor port:



New machined threaded coupling pipe allows for greater insertion and can be trimmed another 1/4" if needed. The diameter was also increased to allow other probes to be inserted into this port.



However, the design allows the Exciter Port to be located anywhere on the floor of the chamber:


When the beam leaves the Exciter Module, its is round and 10mm diameter:



?By the time it leaves the floor of the chamber it is slightly larger and at 3" from the Exciter Module brass fitting it is 25mm diameter.

Beam diameter test jig (Shop-Built Industrial Spinthariscope):
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