Date: Wed, 25 May 2011 15:05:56

Author: Tim Cook

Subject: Re: Crookes Tube (was Re: Demo health hazards) - file is uploaded

Post:

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OK everyone, I uploaded the file and was able to read it so I think it is r=
eady to go. Thanks to Cliff for faxing it to us originally, and I think to =
Jim Krider for making the pdf of it.

Tim

From: tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.edu] On Beh=
alf Of Michael Thomason
Sent: Wednesday, May 25, 2011 1:40 PM
To: tap-l@lists.ncsu.edu
Subject: Re: [tap-l] Crookes Tube (was Re: Demo health hazards)

Tim,

You can upload that pdf to the Apparatus/Demos/Experiments gallery at thesP=
IRA Filesharing site, www.pira-online.org. You=
will need to register with the site and give me a little time to activate =
your account.

By the way, I thought you were retiring!

Michael Thomason, Director of Physics Learning Laboratories
University of Colorado Boulder Department of Physics
303-492-7117
thomason@colorado.edu
http://physicslearning.colorado.edu

From: tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.edu] On Beh=
alf Of Tim Cook
Sent: Tuesday, May 24, 2011 6:16 PM
To: tap-l@lists.ncsu.edu
Subject: Re: [tap-l] Crookes Tube (was Re: Demo health hazards)

I have a pdf of it - 47 pages 3.8 mb. We got it from Cliff Bettis I think. =
When we redid the PIRT website that must have stopped working. It's a gover=
nment document so there should be no problem posting it. Can someone remind=
me where to do this and I'll give it a try.

Tim

From: tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.edu] On Beh=
alf Of Paul Nord
Sent: Tuesday, May 24, 2011 12:41 PM
To: tap-l pira
Cc: Paul Nord
Subject: [tap-l] Crookes Tube (was Re: Demo health hazards)

(I think that this message did not go through. Sorry if it's a duplicate.)

There was an excellent article documenting the X-Ray intensity from one of =
these tubes. Someone had placed dosimeters at various distances in a grid =
around one of these and mapped the radiation flux.

I've lost my reference for that article. I think it was linked here: Defle=
ction of an electron beam | PIRT - Physics Instructional Resource Team

Does anyone have that?

Paul


On Apr 22, 2011, at 4:53 PM, Paul Nord wrote:

I'm picking up a very old thread to share an important video I just found. =
This was made by Adolf Cortel. It's a very convincing demonstration of th=
e x-ray hazard from one of these old Crookes Tubes.
YouTube - Cathode-ray tubes: be aware of X-Rays!

Paul

On Feb 13, 1996, at 2:14 PM, clifford bettis wrote:

I have a letter in my files
concerning all of our crookes type tubes and I tell people who insist
on using this equipment that I will set it up but I will not test it
nor will I be responsible for the regulatory fall out if someone
complains. I show them the letter documenting what kind of exposure
you can get from something as simple as an electron beam tube and a
hand held tesla coil. I have never had anyone insist further than
that, especially since there are safe alternatives to most of the
things the want to show.




--_000_68C8F35A1A5D654D8705E7531EAC342ACEA9294198EX11asuritead_
Content-Type: text/html; charset="us-ascii"
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OK everyone, I uploaded the file and was able to read it so I th=
ink it is ready to go. Thanks to Cliff for faxing it to us originally, and =
I think to Jim Krider for making the pdf of it. Tim From: tap-l-owner@lists.ncsu.edu =
[mailto:tap-l-owner@lists.ncsu.edu] On Behalf Of Michael ThomasonSent: Wednesday, May 25, 2011 1:40 PMTo: tap-l@lists.ncs=
u.eduSubject: Re: [tap-l] Crookes Tube (was Re: Demo health haza=
rds) Tim,=
You can upload that pd=
f to the Apparatus/Demos/Experiments gallery at thesPIRA Filesharing site, www.pira-online.org. You will need to register with the =
site and give me a little time to activate your account.<=
/p> =
By the way, I thought you were retiring! Michael=
Thomason, Director of Physics Learning Laboratories<=
p class=3DMsoNormal>University of Colorado Boulder Department of Physics<=
o:p> &=
nbsp; 303-492-7117 =
thomason@colorado.edu http://physicslearning.color=
ado.edu =
From: tap-l-owner@lists.ncsu.ed=
u [mailto:tap-l-owner@lists.ncsu.edu] On Behalf Of Tim CookSe=
nt: Tuesday, May 24, 2011 6:16 PMTo: tap-l@lists.ncsu.eduSubject: Re: [tap-l] Crookes Tube (was Re: Demo health hazards) I have a pdf of it Ė 47 pages 3.8 mb. We got=
it from Cliff Bettis I think. When we redid the PIRT website that must hav=
e stopped working. Itís a government document so there should be no p=
roblem posting it. Can someone remind me where to do this and Iíll gi=
ve it a try. Tim From: tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.edu]=
On Behalf Of Paul NordSent: Tuesday, May 24, 2011 12:41 =
PMTo: tap-l piraCc: Paul NordSubject: [tap=
-l] Crookes Tube (was Re: Demo health hazards)<=
/div> (I think that this message did not go through. Sorry if it's a dup=
licate.) There was an excellent article documenting=
the X-Ray intensity from one of these tubes. Someone had placed dosi=
meters at various distances in a grid around one of these and mapped the ra=
diation flux. =
;I've lost my reference for that =
article. I think it was linked here: Deflection of an electron beam | PIRT - Physics Instructi=
onal Resource Team&=
nbsp;Does anyone have that?<=
/o:p> Paul=
<=
div>On Apr 22, 2011, at 4:53 PM, Paul Nord wrote:=
&n=
bsp;I'm picking up a very old thread to=
share an important video I just found. This was made by Adolf Cortel=
. It's a very convincing demonstration of the x-ray hazard from one o=
f these old Crookes Tubes.YouTube - Cath=
ode-ray tubes: be aware of X-Rays! Paul On Feb 13, 1996, at 2:14 PM, clifford bettis wrote: =
;I have a letter in my files concerning all of our crookes type tub=
es and I tell people who insist on using this equipment that I will set it up but I will not test =
it nor will I be respon=
sible for the regulatory fall out if someone complains. I show them the letter documenting what ki=
nd of exposure you can =
get from something as simple as an electron beam tube and a hand held tesla coil. I have never had=
anyone insist further than that, especially since there are safe alternatives to most of the things the want to show. =

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