Author Topic: My X-Ray Machine  (Read 549 times)

Offline neukyhm

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My X-Ray Machine
« on: November 28, 2018, 04:42:32 PM »
Hi everyone, I'm new here. I didn't know this forum existed until the user station240 at EEVblog forum suggested to post my machine here too. I'm glad I found this since I'm in love with everything involving high voltage.

I built an x-ray machine as my final degree project. Quick details:

-Fully 3D printed case
-Modified ZVS Mazzilli driver optimized for high frequency
-CEI OX/70-G4 x-ray tube
-Arduino UNO, so it's remotely controlled
-Custom HV transformer made with an ETD59 core (primary is 3+3 turns, secondary is 232 turns)
-Work frequency: ~110kHz
-Power: ~80W



My college's logo




I uploaded a video showing the construction process. The video is not intended to be a tutorial. I'm planning to release the project paper so anyone can see the details, but it must be after I get my mark.


Here are some tests:



« Last Edit: November 28, 2018, 04:50:34 PM by neukyhm »

Offline Mads Barnkob

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Re: My X-Ray Machine
« Reply #1 on: November 28, 2018, 07:14:52 PM »
Hi neukyhm and welcome to HVF :)

That is a nice little machine you built, you really went all in on the details in the construction, which leads me to say that its a wonderful build process video. I like the body cam / CAD overlay combination.

Now for the questions :)

What body cam are you using?

What kind of intensifying screen is it that you are using? I have on/off been looking for phosphorus casettes for future project, but never found any reasonable priced.

What kind of control do you have between the Arduino UNO and the ZVS HV supply? Is it just on/off control of the supply voltage or did you extend the ZVS driver with more active driver circuitry?
http://www.kaizerpowerelectronics.dk - Tesla coils, high voltage, pulse power, audio and general electronics

Offline neukyhm

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Re: My X-Ray Machine
« Reply #2 on: November 28, 2018, 07:33:44 PM »
Hi neukyhm and welcome to HVF :)

That is a nice little machine you built, you really went all in on the details in the construction, which leads me to say that its a wonderful build process video. I like the body cam / CAD overlay combination.

Now for the questions :)

What body cam are you using?

What kind of intensifying screen is it that you are using? I have on/off been looking for phosphorus casettes for future project, but never found any reasonable priced.

What kind of control do you have between the Arduino UNO and the ZVS HV supply? Is it just on/off control of the supply voltage or did you extend the ZVS driver with more active driver circuitry?
Hi Mads, thanks for the welcome :P

I'm using a Gopro Hero 4, wich is not the best option. These cameras are really bad at low light conditions, you can see in the video that it captures very well only the part of the table where the lamp is.

My screen is an old Fuji Speed Green I got at an auction on eBay for 6€, I was very lucky. If you are looking for screens, I have seen some Kodak Lanex on eBay too, they are a bit expensive though

In the video you can see that I'm mounting a relay module with two relays. One of them cuts the x-ray tube's filament and the other one turns on and off the ZVS, no extra circuitry, just this relay between the power supply and the ZVS.

Offline Mads Barnkob

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Re: My X-Ray Machine
« Reply #3 on: January 09, 2019, 09:14:59 PM »
Congratulations on getting mentioned first row in hackadays newsletter!

http://www.kaizerpowerelectronics.dk - Tesla coils, high voltage, pulse power, audio and general electronics

Offline Max

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Re: My X-Ray Machine
« Reply #4 on: January 10, 2019, 10:59:25 PM »
Hi neukyhm!


Great to see the developpment documented in your video. Really nice job and fascinating results! Some shots seem to have quite a high resolution.

X-rays are fascinating, and one day, I'll make my own experiments for sure. However, I'm very, very concerned about shielding. In the video description, you write:
Quote from: neukyhm
it has proper lead shielding. I also used a Geiger counter to make sure there were no radiation leaks.
I cannot see any shielding there. Is the whole room shielded? In any case, I'd alway be concerned about leaks, as your case can never be completely sealed (you need holes for cables, etc).
And, as I've a working x-ray tank (well, the full bridge and control circuit is missing, but transformer, rectifier, voltage divider, etc is all there) capable of a few kW, I consider shielding as crucial. My problem is, if there are any leaks, I and possibly others would be exposed while searching them.

Therefore any details about shielding would be highly appreciated!


Kind regards,
Max

Offline neukyhm

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Re: My X-Ray Machine
« Reply #5 on: January 15, 2019, 10:51:46 AM »
Congratulations on getting mentioned first row in hackadays newsletter!
Yes, I'm very happy :D I wasn't expecting that they published it so quickly.

Hi neukyhm!


Great to see the developpment documented in your video. Really nice job and fascinating results! Some shots seem to have quite a high resolution.

X-rays are fascinating, and one day, I'll make my own experiments for sure. However, I'm very, very concerned about shielding. In the video description, you write:
Quote from: neukyhm
it has proper lead shielding. I also used a Geiger counter to make sure there were no radiation leaks.
I cannot see any shielding there. Is the whole room shielded? In any case, I'd alway be concerned about leaks, as your case can never be completely sealed (you need holes for cables, etc).
And, as I've a working x-ray tank (well, the full bridge and control circuit is missing, but transformer, rectifier, voltage divider, etc is all there) capable of a few kW, I consider shielding as crucial. My problem is, if there are any leaks, I and possibly others would be exposed while searching them.

Therefore any details about shielding would be highly appreciated!


Kind regards,
Max
Hi Max!

At 4:24 in the video, I'm attaching the lead shielding to the box. The thing is that using a lot of lead all around the box and taking care of the holes for the cables and everything is pretty much pointless because of reflexion. The x-rays will reflect on the room walls and you will have radiation going backwards.

What I did is using 1mm of lead that removes around 97-99% of the photons energy. Taking into account that the machine is activated remotely (with a countdown or via teamviewer to send the command to arduino) I think it's safe to operate. You are just waiting in another room or outside the house.

Using teamviewer you can even activate the machine from another country.

« Last Edit: January 15, 2019, 11:45:08 AM by neukyhm »

Offline Agent Smith

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Re: My X-Ray Machine
« Reply #6 on: February 20, 2019, 11:10:28 PM »
Hello,
Great project, a lot of work I bet.
This very night, actually 5 minutes ago i was able to get my first radiograpf after months of trying using that very same tube, 70-G4.
It seems something is wrong with earth and filament connection.
My does not look as good as yours but hopefully you can point me in right direction, what am I doing wrong?
I am miles from that sharp, crisp image you are getting as you can see. Any suggestions?
Thanks :)

//OCV

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Re: My X-Ray Machine
« Reply #6 on: February 20, 2019, 11:10:28 PM »

 


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