Re: [TCML] apple green glow

["DC Cox" <resonance@xxxxxxxxxxxx>]

Below 15 kV the "mean free path" is too short to produce any dangerous hard
X-radiation.  Only soft X-rays with only a few mm penetration power.
In short, they can't even make it thru the glass walls of the tube.

To produce hard X-radiation you need 15 plus kV DC and usually a hard target
like tungsten or molydenum.

Dr. Resonance






On Mon, Sep 1, 2008 at 1:07 PM, TheBypasser <bypasser@xxxxxxx> wrote:

> As far as I understand that, the green glow of a glass tube indicates the
> presence of cathode rays. As a proof, this effect may be obtained in vacuum
> tubes with high voltage pulses supplied to a single electrode (the most
> simple setup is a small unfilled bulb put on a tesla coil or any other hv
> source). As there is no anode, no xrays can be formed by the electrons
> colliding with it (also the energy levels required for a glass to start
> glowing from xrays are long way higher), the effect is definitely a result
> of a cathode ray hitting a glass surface. On the other hand, I'm unsure if
> xrays are not produced in that process as well (however I doubt their power
> is enough to do any harm).
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