home made x-ray machine 2

[davethehunter2]

have you tried soaking the vacuum tube in a mason jar of oil, all real xray tubes keep cooled by oil. your tube would last longer and you would get longer exposures in one run

[c4r0hv]

@davethehunter2

The tube in this video IS under oil. But in this case oil is for HV insulation, not for cooling. Real x-ray tube's anode is designed in a way to have high efficiency of heat transfer to the outside world (which is oil in this case). That's why oil improves cooling - it acts as a heatsink. The tube in this video is just a low power vacuum rectifier and there's no good way of transfer anode heat to the outside of the glass tube, so oil acrually doesn't help that much.

[yo6ial]

@c4r0hv

Did you ever leave the current on for extended periods?

I mean, does that diode cracks from the thermal shock?

And, as the anode goes white-hot, does the X emission change?

[c4r0hv]

@yo6ial

I didn't leave it for long time, but I'm pretty sure the glass would crack quickly. I didn't notice any change after the anode got white hot.

[yo6ial]

@c4r0hv Thanks for the info. I appreciate it!

So, I'll guess I'll sacrifice a diode or two to find out :D

Cheers! 

[kaboooom2000uk]

Very creative. I am pleased you posted this video, what are the operating specifications of your running setup? were you also able to use the tube generate xray images with a photographic plate, or simply testing an idea? It would be interesting to see more.

[toranamunter]

All radioactivity related equipment must be Russian. Its just cooler that way.

[lukebaldan]

@toranamunter

In soviet russia, measuring device kills you!

[emailmemrstara]

Uh your going to get cataracts and a nice brain tumor.

[c4r0hv]

@emailmemrstara

Thank you sir for the diagnosis. So far, I'm quite fine.

[pmgodfrey]

@c4r0hv

Let's check back in 40 years because exposure to radiation doesn't produce immediate effects. Just because you're fine now doesn't mean you won't be later down the road.

[Titanit01]

@emailmemrstara

X-ray head examination si so rare and dangerous :-))) Isn't it? :D

[oneleggedgolfer]

way to give urself cancer!!!u would be better off eating a asbestos sandwich

[c4r0hv]

I would not be so sure about that... Do you even know what asbestos is and why it's cancerigenic? ...

[Driv3th3hiv3]

@oneleggedgolfer

Way to look like an idiot

[JKG317]

What's the beam current on this?

[c4r0hv]

I don't know.

[JKG317]

Could you shoot the beam at a target grounded through an ammeter and test?

Or does it not would that way?

[c4r0hv]

yyy, what are you talking about? There's no electric current in the x-rays beam, it's an electromagnetic wave. When someone says 'current' when talking about x-rays he probably means the tube current, and this is current flowing through the x-ray tube. Anyway, I can't measure that because I don't have this setup anymore...

[JKG317]

Right, I mean, what the beam current in your electron gun?

How many electrons per second are leaving the cathode.

[c4r0hv]

As I said, I don't know.

[delorean60]

I ordered a 60Kv power supply off of a website and it's around 2mA, wouldn't this be enough? They said it would be enough on the website. Also, couldn't you heat the cathode of the rectifier and make it give off more x-rays? That would make it a coolidge tube.

[c4r0hv]

1. 2mA @ 60kV is enough.

2 (heated cathode). It doesn't work this way. Heating cathode increases tube current, and that increases x-rays, that's true. But if your power supply is weak, you don't want too much current draw becayse it causes output voltage to drop. Besides that, HV rectifiers are not designed for generating x-rays and you have to use some tricks to get x-rays. One of that tricks is leaving cathode cold, which allows you to obtain higher tube voltage. That's not so easy to explain.

[Pujc]

Wuhh! Kind off daungerous , I think Use much lead :) It would be Interesting make an x-raiy picture :D . Good work!

[c4r0hv]

I've made some x-ray picrutes - check the link in the video description :)

[P0kerR0b777]

great!

is this a tv tube just with higher voltage or how do you realice this?

[c4r0hv]

Yes.

[sciencoking]

oh shit, the last 3 seconds were quite impressive o_O

home made? how?

hold your camera next to it and look if there are some sparks or flashes on the display

[c4r0hv]

"home made? how?"

- check the video description :)

"hold your camera next to it and look if there are some sparks or flashes on the display"

- do you mean the noise on the CCD caused by x-rays? This video was recorder one year ago so I can't check it now :P But probably there would be a lot of this noise.

[tinchoetercor]

Muy Bueno..

Saludos