2"x2" CsI(Tl) detector

Scintillation crystals, PMTs, voltage dividers etc...
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Joined: 23 Jul 2017, 01:53

Re: 2"x2" CsI(Tl) detector

Post by Zagros » 03 Sep 2018, 05:41

luuk wrote:
15 Aug 2018, 03:50
I made a detector with a CsI(Tl) 2”x2” crystal.
The results are really good and it is very simple and easy to do.
If you interested please read the attachment.
Hello luuk!
great work!
Do you have one more crystal?
Thank you

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Joined: 01 May 2015, 21:00
Location: the Netherlands

Re: 2"x2" CsI(Tl) detector

Post by luuk » 03 Sep 2018, 21:18

Hello Zagros,
I am sorry but I cannot send you pm, it is not working!
But yes I still have a few crystals left.
if intersted contact me.

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Posts: 129
Joined: 01 May 2015, 12:27
Location: Stuart, FL USA

Re: 2"x2" CsI(Tl) detector

Post by iRad » 10 Sep 2018, 14:21

I was able to finish putting together a nice 2X2 CsI(Tl) detector this weekend using one of Luuk’s fine crystals. I have been trying to complete the project for the last month, but very happy with the final results.

I built the detector extra rugged for field use, and included a Ludlum style C connector since I will make this one of my primary companions for use with a good Ludlum analog meter. I spun the crystals can from 6061 Aluminum rod on my lathe and used some very thin aluminum flashing material for the front window that was epoxied into place. The flashing material is very strong, but only .25mm thick, so it should give me very good low energy response. The sides of the can I worked down to 1mm thickness on the lathe, tapering thicker where it attached to the main mu-shield body of the probe. The mu-shield was taken and cut down shorter from another Hamamatsu detector assembly. I used an 8-stage Hamamatsu R6231 with VD wired directly to the pins to keep the probe dimensions short. Overall length of the probe is just over 7.5 inches including the connector.

CsI(Tl) is much denser than NaI(Tl), so this 2” probe should perform more like a good 3” NaI probe only much more compact. Although the crystal itself is not very hygroscopic, I sealed it up very well and made the housing watertight to withstand the rigors of outdoor use. CsI(Tl) is also much less resistant to thermal shock and cracking from bumps and drops, making this probe ideal for use in the field.

Check the pictures and results out. Cheers, Tom
CsI(Tl) 2X2_01.JPG
CsI(Tl) 2X2_05.JPG
CsI(Tl) 2X2_06.JPG
CsI(Tl) 2X2_08.JPG
CsI(Tl) 2X2 RLT0406 - Cs137.png
Cs137 / 6.8% at 662keV
CsI(Tl) 2X2 RLT0406 - Co60.png
CsI(Tl) 2X2 RLT0406 - Lu176.png
Cheers, Tom Hall / IRAD INC / Stuart, FL USA
Please check out my eBay Store: http://stores.ebay.com/The-Rad-Lab

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Joined: 23 Jul 2017, 01:53

Re: 2"x2" CsI(Tl) detector

Post by Zagros » 11 Sep 2018, 06:00

Hello, Tom,
Can you post a spectrum of you background ?
Just curious..

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