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

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)


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
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