Hi Nick,

I am doing some experimental work on the subject of lifespan due to 
sputtering.

Could you provide the full reference, including if possible a chapter or 
page number, for Weston's 50% threshold please? You mentioned it in your 
first post.
Thanks in advance.

Regards,
Alex


On Tuesday, October 1, 2013 4:04:26 PM UTC+1, Nick wrote:
>
> The lifespan of a nixie is not a precise science - end of life may be 
> considered as when luminosity drops by 50% (Weston), sputtering destroys a 
> cathode, cathode poisoning renders a glyph unreadable (though this may be 
> reversible), mechanical damage etc.
>
> I was wondering about the luminosity and sputtering issue. In my 
> experience, nixies rarely run at over 35 - 40C unless heavily over-driven. 
> Would the introduction of a small amount of a halogen, probably chlorine in 
> this case (maybe iodine?), allow a low-temperature halogen cycle to 
> re-deposit any evaporated cathode? I'm well aware that mercury (Hg) is 
> introduced for a similar reason, but a halogen may be safer (in today's H&S 
> climate) if it works at all...
>
> I'm not a physical/inorganic chemist, so thoughts welcome....
>
> Nick
>

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