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Re: [TCML] Need ALPHA WINDOW to detect x-rays in phantom streams

Be careful though; UV radiation also sets off an event. You'll need a thin
piece of aluminum leaf in front to make it x-ray sensitive only.

Sorry for the double email...

On Fri, Nov 23, 2012 at 3:05 PM, ADAM MUNICH <ajm9414@xxxxxxxxx> wrote:

> I believe that Richard Hull has some JAN-5979 GM tubes, the same type
> which I use in my radiation detector. (In fact I bought mine from him)
> http://adammunich.com/geiger-muller-tubes/
> They are very sensitive to x-rays < 100keV and >5keV, but don't plan on
> making any quantitative measurements with them.
> On Fri, Nov 23, 2012 at 12:04 AM, William Beaty <billb@xxxxxxxxxx> wrote:
>> On Wed, 21 Nov 2012, Jeff Behary wrote:
>>> (Though, recently, lightning experts in Melborne FL have witnessed some
>>> of my coils and suggested the possibilty of very low level X-Rays being
>>> produced from the streams - they were the first experimenters to document
>>> non-vacuum X-Rays generated from lightning as well as certain laboratory
>>> sparks.super cool work!)
>> On detecting TC x-rays, here's a possible source of confusion of which to
>> be aware.  Geiger counters are extremely sensitive to x-rays; much more
>> sensitive than any phosphor screen ...but this only is true of fairly hard
>> x-rays.  Down below 20KV, soft x-rays have a hard time getting through a
>> glass x-ray tube, much less a metal GM counter wall.  They also don't
>> penetrate far into water, so they're responsible for the early cases of
>> melanoma (back before the medical designers learned to include a low-cut
>> filter.)
>> So, in order to solidly reject the possibility of soft x-rays, you really
>> need an alpha-window GM counter.  If you only have an inexpensive
>> beta/gamma detector, then you cannot use it to reject the existence of all
>> x-rays.
>> But also, I've seen one GM counter which, when a "vacuum tester" coil was
>> waved about 9" away from the probe cable, responded with great quantities
>> of random-seeming clicks.  I wouldn't have expected such RF interference to
>> sound like a particle flux, yet it did.   No buzz, no 120Hz.  Best to use a
>> tiny kit-style GM counter inside a metal box with a screen-window.
>> Here's a brief holiday sale on a tiny GM counter kit, $9.00 without GM
>> tube...
>>   http://www.goldmine-elec-**products.com/prodinfo.asp?**number=G18410<http://www.goldmine-elec-products.com/prodinfo.asp?number=G18410>
>> Then just buy a 712 alpha-window tube for about $100 from sparkfun etc.,
>> https://www.sparkfun.com/**products/8875<https://www.sparkfun.com/products/8875>
>> ?
>> http://www.lndinc.com/**products/711/<http://www.lndinc.com/products/711/>
>> http://www.imagesco.com/**geiger/geiger-counter-tubes.**html<http://www.imagesco.com/geiger/geiger-counter-tubes.html>
>> Also:
>>   https://www.sparkfun.com/**products/10742<https://www.sparkfun.com/products/10742>
>> ?
>>   http://www.**electronickitsbychaneyelectron**
>> ics.com/prodinfo.asp?number=**c6998<http://www.electronickitsbychaneyelectronics.com/prodinfo.asp?number=c6998>
>> (((((((((((((((((( ( (  (   (    (O)    )   )  ) ) )))))))))))))))))))
>> William J. Beaty                            SCIENCE HOBBYIST website
>> billb at amasci com                         http://amasci.com
>> EE/programmer/sci-exhibits   amateur science, hobby projects, sci fair
>> Seattle, WA  206-762-3818    unusual phenomena, tesla coils, weird sci
>> ______________________________**_________________
>> Tesla mailing list
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