## Bargain LaBr detectors

Scintillation crystals, PMTs, voltage dividers etc...
Steven Sesselmann
Posts: 624
Joined: 27 Apr 2015, 11:40
Location: Sydney
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### Bargain LaBr detectors

I am thinking of introducing a 38*38 mm LaBr detector in my range. LaBr crystals are the current state of the art, they have high light output and fantastic resolution and a whole bunch of other advantages, but not cheap. I recently spoke to some of the guys at ANSTO and they told me how they have just obtained several LaBr detectors for the bargain price of $25,000 each, in fact it was such a big investment they gave the detectors names. I have been offered 38*38 mm LaBr with a 3.5% resolution guarantee at a much better price, and will be able to offer complete LaBr detectors for around US$ 7500.00, it is not likely that I will be holding these in stock, but if anyone is interested I will make them to order with selected grade PMT's.

Steven

Sample spectrum provided by my supplier
LaBr spectrum
labr.png (743.16 KiB) Viewed 2098 times
Steven Sesselmann | Sydney | Australia | gammaspectacular.com | groundpotential.org | rephopper.com | beejewel.com.au |

luuk
Posts: 192
Joined: 01 May 2015, 21:00
Location: the Netherlands
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### Re: Bargain LaBr detectors

Hi Steve,
What is the background cts/min./cc from this crystal?
Luuk

Steven Sesselmann
Posts: 624
Joined: 27 Apr 2015, 11:40
Location: Sydney
Contact:

### Re: Bargain LaBr detectors

Luuk,

According to the supplier, background due to 227Ac is less than 0.15 cps/cc

I work that out to around 12 cps for a 38*38 crystal (720 cpm)

Steven
Steven Sesselmann | Sydney | Australia | gammaspectacular.com | groundpotential.org | rephopper.com | beejewel.com.au |

luuk
Posts: 192
Joined: 01 May 2015, 21:00
Location: the Netherlands
Contact:

### Re: Bargain LaBr detectors

Hi Steve,
That sound good but I expect that you get about 30% more background around 18 c/s.
That may look low but you need a good background subtraction if you want to use LaBr3 while measuring low activity samples.
Resolution is great if lucky you can get as low as 2.8% for 662KeV.
I have some crystals 38x38mm to test next week and shall make a background spectrum for the forum to show what to expect.
Luuk

Steven Sesselmann
Posts: 624
Joined: 27 Apr 2015, 11:40
Location: Sydney
Contact:

### Re: Bargain LaBr detectors

Ac227 has a half life of 21 years, does that mean these crystals improve with age?

Maybe a good long term investment ..
Steven Sesselmann | Sydney | Australia | gammaspectacular.com | groundpotential.org | rephopper.com | beejewel.com.au |

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