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