CsI(Tl) crystal problem

[luuk]

Hi all,
I saw recently some problems with CsI(Tl) crystals.
if interested please read the pdf.
Luuk

[Sesselmann]

Luuk,

Thanks for sharing. This brings into question the kind of quality control procedures at the manufacturers. One would think that homogenous mixing of the chemicals would be one of the key steps.

I also experience inconsistent qualty control from manufacturers and in some cases crystals are labelled as tested with 6.5% resolution when in fact the resolution is less than 8%.

The manufacturer is always happy to replace poor resolution crystals, but it wastes a lot of time and shipping.

Steven

[luuk]

Hi Steven,
Like I wrote this is really an exceptional case it is very rare that this happens.
I have seen ten thousands of crystals and it happens almost never but
this was such a strong effect that I just had to take some pictures to show you.
And as hobbyist I expect you will never see it in your own detectors(in this form)
So that may explain why the don’t check every crystal that leaves the growing facility.
Luuk