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Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Not definitely nonsense at all. It may possibly work if you remove the magnet, don't apply heater current, and apply a sufficiently high voltage.
Many types of thermionic valves [USA: "tubes"] can be driven to produce X-rays by cold cathode discharge by running them at a suitably high voltage without applying heater/filament current.
Popular valves used by amateur X-radiographers are PD500 [in Europe] and the 6BK4B [in the United States,] which are similar EHT shunt stabiliser triodes used in valve-era colour television sets.
Many television EHT rectifier diode valves can also be made to give enough X-radiation for amateur experiments.
A magnetron - which has already been designed to hold off quite large voltages - could very likely emit X-rays if you discard the magnet, do not apply heater current, and stick 40kV and more across it in a suitably safe way.
Make sure you have a reliable means of detecting and measuring any X-rays produced, and be very careful indeed with all that you do.
Registered Member #3059
Joined: Tue Aug 03 2010, 04:09AM
Location: My turf
Posts: 18
You will have to apply the heater current, since Magnetron was pumped to the same Torrs as X-ray tube, it's so that way the microwave don't get attunated when being resonated among capacitor ring inside it. So you will have to apply the power to heater, then Presto, a powerful X-ray tube! When I say "Powerful", you would get away with 200mA of 50kV - but be especially warned when you hack that magnetron tube: That stuff will emit especially nasty hard X-ray (0.8 - 0.01nm - depending on how much you're willing to punish your inverter...). Mucho power can be obtained with Marx - up to 5 Megawatts pulses. You would definitely don't want to stand in the front of your newly-bapisited X-ray tube, a very bad idea...
Registered Member #2893
Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
The only possible use I see for this is a death ray. If you apply 75kV at 200mA you'll get a ridiculous amount of radiation, but it will be unfocused and moving in all directions. Thus it'll be unsuitable for taking any pictures.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Dr. Mario wrote ...
You will have to apply the heater current, since Magnetron was pumped to the same Torrs as X-ray tube, it's so that way the microwave don't get attunated when being resonated among capacitor ring inside it. So you will have to apply the power to heater, then Presto, a powerful X-ray tube! When I say "Powerful", you would get away with 200mA of 50kV - but be especially warned when you hack that magnetron tube: That stuff will emit especially nasty hard X-ray (0.8 - 0.01nm - depending on how much you're willing to punish your inverter...). Mucho power can be obtained with Marx - up to 5 Megawatts pulses. You would definitely don't want to stand in the front of your newly-bapisited X-ray tube, a very bad idea...
If you connect a 50kV 200mA supply to a heated oven magnetron, the magnetron will be destroyed immediately.
However, if the magnetron is left unheated, then some X-rays will be produced by field emission electrons impacting the anode if a sufficiently high voltage is applied. As soon as heater current is applied, the voltage drop across the valve will fall to a low value insufficient for significant X-ray production to occur.
The more thoughtful and discerning reader will remember that some old TV EHT valves only became X-ray hazards when their heaters had failed, so the voltage drop between anode and cathode rose to the full EHT supply voltage and field emission occurred.
Registered Member #2941
Joined: Fri Jun 25 2010, 08:08AM
Location:
Posts: 143
hydraliskdragon wrote ...
I was browsing some website when I saw a big title saying "Make An X-Ray Machine With A Magnetron!"
Is this possible with the correct voltage? Or is this guy talking nonesense?
I did it ,once . removing the magnet from the tube,for the power supply I use a microwave oven transformer ,his capacitor and a spark gap dumping the capacitor in to a double plastic boxed car ignition coil . it give about 140 kv output in 100 hz,with a lot of current. the spark gap was set at one millimeter, next ,I plug the anode in the transformer along with one of the side of the ignition coil and and the cathode on the other side of the coil.a lot of tape to give some sort of dielectric isolation first time I tested ,my geiger counter want crazy ,even at 3 meter from the set up,first I was thinking it was du to the electric field who might have influence the counter, but than I tested with a fosfor screen and I sow the light ,it escape from the ceramic side ,the copper cathode is way to thick to let much out ,I think that this day I get my ten year radiation dose all at one,not very smart ,any way in this set up the system could not work more than few second at a time or the tube would get destroy ,and after some time the ignition coil left this world in a flaming and smoking agonies. a magnetron with out magnet is just a high power vacuum diode,so there is no problem getting radiation out ,now for practical purpose ,an x-ray tube is much more efficient and a lot less dangerous (at list you know where most of the radiation are going..)
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Dr. Mario wrote ...
When I say "Powerful", you would get away with 200mA of 50kV - but be especially warned when you hack that magnetron tube: That stuff will emit especially nasty hard X-ray (0.8 - 0.01nm - depending on how much you're willing to punish your inverter...).
X-rays of wavelength 0.01nm have an energy of 124.125keV, so this wavelength could never be produced by a 50kV supply, no matter what sort of X-ray generator was used.
The shortest X-ray wavelength possible with a 50kV supply is 0.024825nm.
Moreover, X-rays of wavelength 0.8nm have an energy of 1.55keV, and rather than being "especially nasty hard X-rays" are so extremely soft that they would be unable to leave the magnetron shell, and even if we were to imagine that they could, then specialised instruments would be needed to detect them,.
Are you reporting nonsense you have seen elsewhere, or just making it up as you go along?
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X-Ray VS Magnetron?
