WHITNEY CAR PARTS : I'd add some anecdotes, too. Years back, one problem that needed solving was that the tungsten targets were "burning up". The answer was a rotating target. Voltages starting at about 20kV produce very soft X-rays, I believe, with medical instruments using from 50kV to 70kV, depending on the type of tissue they want to see through. Use very low currents at first, well below 1mA if possible.From: ()Subject: Re: Anyone made homebrew X-ray machine?? Newsgroups: Date: 1994-07-29 01:14:18 PST In article ,Ryan D Egeland wrote:---------------------------------- ----------You are using far more than 200V here if you are generating X-rays. Whenyou said a car ignition coil, I would have thought you meant you thought itput out 200V! That woudn't work and neither would a spark coil's 7000 Vwork at 12 VDC input. I am guessing you are putting 200 volts through a carignition coil!!! I don't think that's wise, even with current limiting.I don't think the coil will handle that for long. And if you are then youare using 200 VAC input to create about 80keV, which WOULD work. Befreaking careful with that!!! You're going to make your hair fall out andthen you'll start puking!!! It might take a while though!-Steve Walz
WHITNEY CAR PARTS : From: ()Subject: Re: Anyone made homebrew X-ray machine?? Newsgroups: Date: 1994-07-31 18:05:53 PST In article ,Richard Steven Walz wrote:I remember building a mini x-ray source one time using a TV HV rectifier tube (forget the exact part #). I was actually testing a HV power supply for an x-ray source that I was designing for work, so it was a semi-legit experiment. Anyway....My advice would be to keep the voltage down to 20 kV or so. Less of a chance of hurting yourself (both from x-rays and electrical shock). The corona discharge should be less of a problem also. 20kV photons can easily be stopped by a thin piece of steel, so please put up adequate shielding so you don't nuke yourself. You may want to invest in a cheapie used geiger counter or survey meter to check out your setup. I've seen used Victoreen survey meters at hamfests for $20 or so. 0.25 milliRem/hr is considered "safe" for those exposed to radiation at work (ie: 40 hrs/week).
WHITNEY CAR PARTS : I've often wanted to expose some of my UV fluorescent minerals to low energy x-rays, wonder if they would react to it?I don't know about this, but I have used a much easier method when I was12. Use those damper diode tubes from the HV section of an old TV set.Its been so long, so I forget the popular tube #'s, but I think they weresomething like 1U4's etc. Anyhow, easy to identify, since they usuallysit in a big socket with a plate connection at top.Most can light filaments with 1.5 V carbon/alkaline cell, so then allyou need is a source of HV. At the time I used an old Ford model-T coil(which I can't seem to find anymore :( ), but you could rig up an ignitioncoil, perhaps to a buzzer of sorts.I didn't have photographic paper, but I did have BW negatives and developers,so I put negatives (big 620(?) film at the time) in between cardboard, andtapped it up carefully, in the closet (my darkroom). Don't use electricaltape though, because it emits light(!) when peeling it off of the roll(the light is from static electricity).
WHITNEY CAR PARTS : Then place the carboard assembly underneath the tube, and start up theunit, from a distance (every X-ray is russian-roulette with cancer,so be careful).After suitable exposure, turn it off and develop the film. I admit, photographic paper is probably easiest. The amount of X-rays from thetube is fairly small (though depends on input voltage), so I exposedmine for quite a while. I did see the corrigated cardboard patternscome out though.Quite an experiment for me at that time. Can youimagine the horror on my mother's face "what? X-rays?! You're goingto Zap yourself to death... glow in the dark or something!"--------------------Warren W. Gay VE3WWG John Coutts Library Services Limited Niagara Falls, Ontario, Canada(or From: ()Subject: Re: Anyone made homebrew X-ray machine?? Newsgroups: Date: 1994-08-01 23:48:45 PST In article , (Warren Gay) writes:
WHITNEY CAR PARTS : THis morning calling local muffler shops, I found a "flex pipe" for my'80 Scirocco sells for $65 (new aftermarket). A local VW used parts stockingshop wanted $50 (probably used VW). The local U-Pull It yard charged me $5for this pipe (in very good condition, still plated inside!). So, my questionis: Do you really get what you pay for? or maybe a little more? Oh yeah, my mechanic charged me his usual hourly rate of $12/hr forworking on the weekend ($6.25/hr during the week), But I am my own mechanicso I took myself out to lunch... Favorite place to work: in the garage (not under a shade tree, becausethere are ants out in the grass under the trees around here). :) Mark '70 Beetle '80 Scirocco_S w/ '85 GTI engineI started out the same way as a "shade tree mechanic", in fact I stillam. I do about 90% of the work on my cars, and only ship them out tosome one when I don't have either the time or expertise to work ona particular problem.
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