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Re: [TCML] Tesla Coil and X-ray tube


According to this table:


your 9 cm arc between sharp electrodes should be indicating about 70 kV, which should be enough to make X-rays.

Even without external rectifiers, an X-ray tube is capable of operating in self-rectifying mode on an unrectified AC source.  It would produce a lot of unwanted, scattered radiation on the reversed biased part of the cycle, but it should still  produce plenty of X-rays when forward biased.

Have you checked for X-ray output with a foolproof X-ray detector like an X-ray sensitive phosphor sheet from a medical X-ray cassette?  Have you been able to see any faint green fluorescence of the tube walls during operation?

How can you be certain that your X-ray detectors are working properly?

From what I've read on the Geiger Counter Enthusiasts Usenet groups, ionization chamber radiation detectors are the preferred devices for detecting and measuring X-rays in the energy range that you indicated.

In the circumstances you describe, I would speculate that either your tubes are up to air, and not producing X-rays, or that your detectors are not working.

See if you can find a sympathetic dentist to direct his X-ray machine at your detectors to be sure that they are actually working.  Typical dental X-ray machines run in the  88 - 100 KV range.

Be careful.  70 KV X-rays will produce a substantial skin dose while being imperceptible.


On 1/26/2018 8:20 AM, Michael Loundry wrote:
Dear subscribers,
I have recently bought Tesla Coil with adjustable output voltage 5 - 100kV.
It is driven by thyristor (SCR) circuit and powered from the mains.
Tesla coil itself is in mineral oil. Secondary has both ends available from the plastic case, so there is no grounding.
It is this unit: http://i.ebayimg.com/images/i/311006967911-0-1/s-l1000.jpg
The Tesla Coil seems to be powerfull enough - can produce a lot of ozone, arcs can be at least 90mm long.
Input power is around 200W.
I would like to ask you, if you think that with this Tesla Coil I should be able to produce X-rays? What I have?
- Proper lead shielding
- NaI 2.5x2.5" scintillator probe with sensitivity for 15keV - 3MeV
- Additional Geiger Counter with sensitivity from 50keV - 3MeV
- X-ray tube Trophy/Kodak TRX708
- Vacuum tube DY87
- 20x rectifier diode for 18KV, 20mA (can be connected in a series)
My goal is to produce X-rays, but unfortunately I am not able to do so in any case.
Both X-ray tube and vacuum tube are basically new and verified to work.
What I have tried:
1. Heating filament with AC/DC to nominal current/voltage for maximum electron emmisivity.
2. Connecting TC to Anode and Cathode.
3. Changing TC polarity on the panel (this is swapping live/neutral for the primary side).
4. Using rectifying diodes so that output is pulsed DC.
5. Swapping Anode and Kathode wires.
6. Tried to change filament voltage from 0 to max allowed.
7. Tried same procedures with DY87.
8. Tried it with arcing (wire for cathode had a small gap to create arcs).
Of course collimator from the X-ray tube is positioned parallely to radiation detectors. What I was able to produce was just RF in some cases. Could you please let me know what could be wrong? Why my Tesla Coil is not producing any X-rays? Is some grounding required?
I know my meters can pick X-rays pretty well.

Thank you!
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