[sdiy] OT: Today's toxic mess

[danial stocks]

>
> >P.S. I used to install and repair X-Ray machines in the past, but I've
> >never personally owned an X-Ray tube.
>
>Why do they rotate, anyway? I was hoping someone would tell me.
>
>

very large x ray tubes.. typically you would run it at 100-250kv, and prolly 
up to 50 ma or more in a large scale situation.. so if we said that 200Kv 
20ma, thats 4000 watts being dissipated on the anode [ these are notoriously 
inefficient, most of the dc is dissipated as heat.] so the anode spins to 
take the heat away from being just dumped in one area, which would most 
likely melt it even tho it is made of tungsten.. I have a rotary anode one 
and you can see a ring etched around the anode where the electrons strike..
Cheers,
Dan
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