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Re: [TCML] current limit system and X-rays



David Rieben wrote:
Hi,

snipperzz:

----- Original Message ----- From: "Frank" <fxrays@xxxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Sunday, September 26, 2010 6:00 PM
Subject: Re: [TCML] current limit system and X-rays



Almost the universal voltage for most X ray work is 40-60 KV.

Using an NST will not work unless you can series them, even a 15KV transformer will be pushed.


Actually, dental x-rays typically run 60 to 70 kV at only
a few mAs. However, medical x-rays can run >100 kV at hundreds of mAs, depending on how much soft tissue that
must be pentrated to get a clear image of the target "innards".
Of course, exposure time is nearly always in the fractions of
a second.


and it gets trickier than that, because a standard accelerating voltage for medical x-rays is 110kV.. BUT, the actual energy of the xrays coming out is quite a bit less ( peaking at around 30keV), but a typical x-ray machine will use an aluminum "hardening" filter that filters out the lower energy photons, leaving the remainder averaging up around 50-60 keV.

But.. it would be unusual to get significant xray production from NST voltages, even in a hard vacuum. After all, the maximum energy would be the 21kV peak voltage from a 15kVrms NST, and just as with the 110kVp xrays, the vast majority of photons will be much lower energy, and not even make it out of the tube.
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