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Registered Member #119
Joined: Fri Feb 10 2006, 06:26AM
Location: USA
Posts: 114
Someone said that my "NaI(Tl)" scintillator should have a slight yellowish tinge and mine was too clear to be NaI(Tl). We then shined UV light on it which caused it to fluoresce. He says that NaI(Tl) should not fluoresce under UV light, indicating its actually likely an organic scintillator.
Can anyone verify that real NaI(Tl) should not fluoresce under UV light? I looked around a little and couldn't find any references to this.
I don't have a picture handy but can post if that's useful.
Registered Member #33
Joined: Sat Feb 04 2006, 01:31PM
Location: Norway
Posts: 971
NaI:Tl scintillators in good condition should appear water-clear. The yellow tinge often indicates a slightly degraded crystal. I'm unsure if NaI:Tl fluoresces under long wave UV, but if I remember it I can try to do a quick test over the weekend. It should nevertheless be quite easy to distinguish NaI scintillator from a plastic scintillator, as NaI has a density around 3.7 and typical plastic scintillators have a density of around 1 [g/cc].
Registered Member #119
Joined: Fri Feb 10 2006, 06:26AM
Location: USA
Posts: 114
Yes, longwave UV is what I tried
Good idea but its part of an assembly so its not easy for me to do a density check. I suppose I could try to disassemble but the UV approach seems much less invasive if I can get someone to add data.
Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1714
If it helps with identification, I could bring filtered UV lamps in both longwave (365 ?) and shortwave (254). When I illuminated an assortment of miniature light bulbs in a clear plastic bin, could have sorted them by glass type according to which ones glowed under each wavelength. My chunk of plastic scintillator glows under at least one of those UV's, as well as x-rays.
The fusor forum is another place with regular readers having first-hand knowledge of scintillator materials.
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Do I have NaI(Tl)?
