LutetiumI'm in Italy btw
@guido.giunchi if I don't find something on ebay I usually look for it on aliexpress
If you guys don't have a microwave transformer, another experiment you can do is a Marx generator
pretty amazing too
https://www.youtube.com/watch?v=oVXp3OkraMc
@Fran Piernas - is that where you sourced your dental X-ray tube?
the one wire of output side of MOT is connected to the core and if you touch it you die, what about to built some insulating box for it?
I bought it on ebay, I was extremely lucky to find it new from a US seller
@vincent stuchly you can do it, however if you care about not touching it you are safe
Hey @Sophi Kravitz
I would have x-rayed my hand!
MOTs are "low" voltage, just 2kV
Got something for you
Hi everyone!
@Nevermore78 Hi partner!
hmmm you're not near your terminal, better PM
About sourcing tubes, it's the hardest part, I'd talk directly to the factory
Here you have one: https://www.alibaba.com/product-detail/30mA-50mA-x-ray-tube-x_570569498.html?spm=a2700.galleryofferlist.normalList.263.70744e11DbxBOd
And my tube's manufacturer: http://www.cei-xray.it/index3dab.html?l=eng in case you want an x-ray tube
cool, how much was your tube? also what psu do you use for it?
However there are other ways to make x-rays, try a 2C2S tube: https://tubes-store.com/product_info.php?products_id=906
I once had a burned out rotating anode X-ray tube that was removed from service. The tungsten target was amazingly cracked and blistered from all the use. Powerful things.
I could buy some for 2€ each on ebay
Bet it still would have made X-rays, though. Alas, it broke when we moved.
@anfractuosity my tube was 70€, very cheap
@Fran Piernas What can you buy for 2€?
@anfractuosity also the PSU, I build it, take a look to https://hackaday.io/project/162935-piernass-fast-zvs-mazzilli-driver
@guido.giunchi a 2c2s tube, it's not designed to x-ray, but can be used for that purpose
just don't expect to have the same results as when you use a genuine x-ray tube
ooh thanks a lot!
Yes, I build an x-ray machine using that tube many years ago
This is the first machine I built
Wow it is not so expensive as I thought!
@Fran Piernas Did your tube come with a scintillation screen or did you buy that separately? I could not see that part on your Xray project list.
@Glen Slade I bought the screen on ebay, an auction I won for 6€ XD
You are right, I forgot to add it to the list
It's a Fuji SpeedGreen
Thanks
I designed its support and printed it
What is the smallest dot you can resolve in your xray machine?
@guido.giunchi what do you mean, the smallest thing I can see?
I'd think it would be limited by the grain of the phosphor screen, no?
Yes, high speed screens are do emmit more light
however they are worse at resolution
But I haven't ever had a problem with mine
It's also a function of the cathode size, as I recall from my radiologic technologist days. The larger the cathode, the less detail you can get.
Yes, you want a point like x-ray emmiter
Dental tubes have pretty small cathodes, if I recall correctly
Yes, how detailed can you your scans get?
Yes, the focus is very small
@guido.giunchi here you have some examples:
you see it works pretty well
Do you guys have an automatic breaker at your houses?
That's how it works
@Fran Piernas , I think you mentioned that you're not even in the room when the X-ray is on. Is that correct?
Neat! I love the circuit breaker shots!
I'm not, I set a countdown and leave the room, then I go to another room where I didn't measure radiation and stay
Or a use a remote desktop app to connect to the laptop
and from it, send the command to the machine
This example of the iphone, I like it a lot
Smart move. Have you ever measured the maximum dose your setup can deliver?
it shows the haptic engine
@Dan Maloney I did some measurements, like this:
https://www.youtube.com/watch?v=xqsy9tpHCf0
However, it's a counter so it counts radiation, it's bad at measuring high radiation
a proportional meter has to be used for this
@Fran Piernas how far was that from the tube?
@Nevermore78 if I'm correct, 2 meters
Yeah, but still - that thing isn't fooling around! Good to be careful with it.
The shots are insanely cool! Do you ever think you can put yourself in danger with the high voltage and radiations?
@guido.giunchi I don't think I'm getting radiation, I got to a room where I measured nothing but background radiation
and about HV
how is the radiation pattern around the machine?
You could wear one of these! https://en.wikipedia.org/wiki/Film_badge_dosimeter
a pair of gloves do the trick, also If you are working with very HV, like >50000V, use liquid paraffin
that's something that made me got mad, I spent a lot of time looking for HV insulators
some people uses sunflower oil
and I found that liquid paraffin from the pharmacy is a los cleaner and better
@Nevermore78 it's hard to know, the machine does have lead shielding, but when it's activated, there is radiation in the hole room, mostly because of backscattered x-rays
@neil k. sheridan - I followed that link and clicked through on "electronic personal dosimeter" - pretty cool, they're using PIN diodes and MOSFETs as sensors in all-electronic dosimeters now. No need to send film off to be developed.
like you apply oil/paraffin to the gloves, right? I am hearing this for the first time so sorry for stupid question
@Dan Maloney ooh! Interesting I will have a look at that!
@vincent stuchly in fact you take you HV stuff and put it in liquid paraffin
just like I did with the multipler
right, haven't thought of backscatter!
FYI, liquid paraffin is also called mineral oil here in the States. NOT baby oil - that has fragrance added.
oh my bad, sorry got bit confused :D
it's full of liquid paraffin (mineral oil) in there
There are alternatives, oils that are designed for this purpose, but they are hard to find and very expensive
I bought 1 liter of mineral oil for 10€
https://hackaday.com/2018/09/18/a-look-at-liquid-dielectrics/
A Look at Liquid Dielectrics
One evening quite a few years ago, as I was driving through my hometown I saw the telltale flashing lights of the local volunteer fire department ahead. I passed by a side road where all the activity was: a utility pole on fire.
I did a test to the oil to see if it was suitable
https://www.youtube.com/watch?v=5ARtZICuqGg
the oil managed to stop arcs, as long as you avoid hard edged or corona effect will happen
ooh
what about kerosene?
sorry haven't read scrollback
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