[ RadSafe ] CRT monitor radiation "scare" at Newark airport

[Cary Renquist]

Answering myself again...
The Lanthanides used for phosphors appear to be quite pure, so not likely to be a source of radioactivity:
  "However, for electronic or spectroscopic use ('phosphor grade') 99.999% purity is
  necessary, and currently ion-exchange is used for final purification to these levels."
 
Perhaps it was an old monochrome display that used the orange phosphor, KMgF3:Mn...
 
Cary

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From: radsafe-bounces at health.phys.iit.edu on behalf of Cary Renquist
Sent: Mon 20-Dec-10 11:55
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Subject: Re: [ RadSafe ] CRT monitor radiation "scare" at Newark airport



I guess that there could be some radioactive impurities in the phosphors, since many of the phosphors use lanthanoids as dopants.  I see a potassium-based phospors as well.

Phosphor Technology CRT Phosphors
<http://www.phosphor-technology.com/products/crt.htm>

Cary
--
cary.renquist at ezag.com

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From: radsafe-bounces at health.phys.iit.edu on behalf of Cary Renquist
Sent: Mon 20-Dec-10 11:14
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Subject: Re: [ RadSafe ] CRT monitor radiation "scare" at Newark airport




I'm a bit confused...
What sort of CRT emits radiation when it is not powered?
Is NORM used in the tube?

Cary
--
cary.renquist at ezag.com

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From: radsafe-bounces at health.phys.iit.edu on behalf of Strickert, Rick
Sent: Mon 20-Dec-10 07:21
To: The International Radiation Protection (Health Physics) Mailing List
Subject: [ RadSafe ] CRT monitor radiation "scare" at Newark airport