GS-1010-LABR-14 New Build with 3.3% resolution

[Sesselmann]

Hi Guys,

I just finished a nice 1" LaBr3 detector and MCA for a client and thought it might be interesting to share.

This build starts with a good quality LaBr3 Crystal, there are expensive, but worth the money.

crystal.jpg

Next we require a good PMT, here I am using a new 14 Pin ET Enterprises PMT.

pmt-14.jpg

Next up I have made up a custom machined black anodise aluminium housing tube.

housing.jpg

A lining of magnetic shielding (Mu metal) is inserted around where the PMT will be..

magnetic_shield.jpg

A ground wire is attached to the magnetic shield which will later connect with the anode on the PMT.

ground_wire.jpg

To maximise resolution I am using a 2" PMT with a 1" crystal, this means I need something to centre the crystal on the face of the PMT, so I am using a low density foam block for this purpose, which has been machined to fit the tube and crystal.

foam-and-crystal.jpg

foam_in_housing.jpg

foam-crystal.jpg

This is the finished detector with GS-MAX-14 MCA attached.

finished_mca.jpg

The final spectrum is as expected Spectacular

Cs-137_spectrum.png

These products are made to order, but I can usually deliver one of these in 3-4 weeks.

GS-MAX-14 8000 Channel MCA
https://www.gammaspectacular.com/blue/g ... /gs-max-14

GS-1010-LABR-14 Lanthanum Bromide detector
https://www.gammaspectacular.com/blue/g ... 10-labr-14


Steven

[Madmax]

Nice job, Steve!
Waiting when somebody will order 3"*3" Labr3...

[Marco75]

simply amazing!!

[Marco75]

you are going to tempt me , replacing my GS-2020-CSI for one of these ;-)

[Marco75]

Hi Steven,
would you please post a Th232 spectrum with the same unit, if possible?
It would be interesting to see the difference with my GS-2020-CSI

[Sesselmann]

Marco,

As requested here is a quick Thorium spectrum recorded with the GS-1010-LABR before I ship it to the client.

The high resolution crystal has excellent resolution, but as it's tiny 1" volume means it has low efficiency at the higher end of the spectrum.

Steven

labr3-th.jpg

[Rob Tayloe]

A while back Steven made me a LaBr detector with a 1" crystal. Attached are a few results (using PRA) of some different thorium sources. The sources were: a thorium laden lantern mantle, a small thorite stone, and a small bottle of ThO2 powder. I don't recall the count times or the geometry and the x-axis is in "bins" rather than energy.

labr-thorite.jpg

labr-tho2.jpg

[Rob Tayloe]

For some reason the Th lantern mantle continues to give a "http error" regardless of how I make the screen capture. :(

[Rob Tayloe]

The screen capture must have exceeded some size limit. I downsized the screen capture. Here is the LaBr spectrum of a Thorium laden lantern mantle. X-axis in "bins" not energy.

th man1.jpg

[Sesselmann]

Rob,

That's a nice clean spectrum, looks a little bit sharper than the one I just posted, I suspect I had a bit of temperature drift during my recording as the day was just warming up here.

The GS-MAX-14 does have temperature compensation, but I did not have any probe attached, nor has it been calibrated.

But yes, your detector is looking great 👍

Steven