The radiation hazard is comparable or less that the hazard of a concrete or 
natural stone wall in your house. however the wall is more less healthy, 
because Radon is an alpha radiating gas that you inhale in your lungs....

Anyhow, an hour in an airplane at 10,000 ft gives a considerable higher dose.

eric

-----Oorspronkelijk bericht-----
Van: [email protected] [mailto:[email protected]] Namens 
NeonJohn
Verzonden: dinsdag 14 maart 2017 23:38
Aan: [email protected]
Onderwerp: Re: [neonixie-l] Radioactive Nixies - Study



On 03/14/2017 02:01 PM, gregebert wrote:
> Anyone know how the radiation "hazard" of nixies compares to Xrays 
> produced by color televisions/computer monitors that used CRTs ?
> 

None vs none.  As soon as the low level X-rays from TV sets were discovered and 
became and issue (two different events), several things happened

1) All new CRTs had their faceplates made out of leaded glass.
2) the damper tube was made from leaded glass*
3) hard high voltage limiting was instituted.

* A properly made damper tube would not generate X-rays regardless of the 
voltage applied.  The plate cylinder had to be a little bit out of 
concentricity with the filament to produce X-rays.

There was an Amateur Scientist article about how to use a damper tube and a 
home-made Odin coil to make an X-ray source.  Several fuzzy X-rays were 
published.

I made the Odin coil but I could not get any X-rays.  My tube was in good 
alignment.  It took prowling through the inventory of the two TV repair shops 
that tolerated this nerdy kid before I found one that worked.

The results were still lousy because the X-rays emanated from all over the 
anode's surface.  The optical equivalent is trying to take a shadowgraph photo 
of an object using and extremely point source LED vs using light from a 
recessed fluorescent fixture.  Real X-ray tubes use several tricks to make as 
close to a point source as possible.

Anyway, back to CRTs.  I have a Victoreen survey meter designed specifically 
for the CRT industry.  It uses an ion chamber with a super-thin mylar window 
and is calibrated microR/Hr.  I have never detected anything above background 
from any of the TVs or CRT monitors I've owned.

John



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