RE: spark gap x-rays !
Hi All on list,
I know this thread died a while ago but I just thought I
would mention that I looked into the possible X-Ray output from my coil some
I borrowed one of the Universities Geiger counters and pointed it at my 800W
The coil was within a Faraday cage of chicken wire and producing 2-3 ft of
arc at the time.
I was horrified to find that the counter instantly registered nearly 100
counts per second!
Common sense prevailed when I realised that the high order harmonics leaking
through the cage were hitting the counter's electronics, and giving an
erroneous reading (thinks..100 counts= 2x 50Hz......thinks... spark gap RF!)
I then tried X-Ray film badges all over the place, including one on the
I also got brave, and put one next to a 100watt 240v bulb on the top of the
Guess what.. They all came back from the NRPB lab negative!
No detectable X-Rays.
Run times were no longer than 3 minutes BTW, but I did do at least 4 runs on
I'm not sure what results I would have got with a longer exposure or a
bigger coil, but I thought I would throw that data in for what it's worth.
Regards Martin Dale TCBON
> From: Tesla List[SMTP:tesla-at-pupman-dot-com]
> Sent: Tuesday, January 05, 1999 6:54PM
> To: tesla-at-pupman-dot-com
> Subject: Re: spark gap x-rays !
> Original Poster: Hollmike-at-aol-dot-com
> In a message dated 1/5/99 2:43:43 AM Mountain Standard Time,
> > I wouldn't trust any electronic measuring device such as a geiger
> > counter close to a TC - a film badge would be much more appropriate
> Not a bad idea. It reminds me of a time when one of my coworkers
> left his TLD badge next to his computer monitor. Caused a bit of a stir
> it was developed. Should work for checking out a gap.