Re: Fluoroscope (fwd)

[<sroys@xxxxxxxxxxxxxxxxx>]

---------- Forwarded message ----------
Date: Mon, 18 Oct 2004 01:47:41 -0400
From: Jack Vandam <snotoir7674g@xxxxxxxxxxxxxx>
To: High Voltage list <hvlist@xxxxxxxxxx>
Subject: Re: Fluoroscope (fwd)

Nice radiographs!  Taking them with a digicam from the screen as you did is
very convenient.  An actual x-ray tube, as you have, does put out a
surprising amount of radiation.  The way you describe your setup, it doesn't
look like you used an actual "closed" x-ray head.  I'd be more interested in
hearing about it.  Did you have to oil immerse the tube?  Also, how did you
go about obtaining your radiation measurements?

X-rays definitely aren't anything to fool around with without protection and
I am currently fabricating a 2' hollow leaded cube, where the x-ray source
and object can be totally enclosed before making exposures.

Nice work!

Jack

----- Original Message -----
From: "High Voltage list" <hvlist@xxxxxxxxxx>
To: "hvlist" <hvlist@xxxxxxxxxxxxxxxxx>
Sent: Monday, October 18, 2004 12:52 AM
Subject: RE: Fluoroscope (fwd)


> Original poster: <sroys@xxxxxxxxxxxxxxxxx>
>
>
>
> ---------- Forwarded message ----------
> Date: Sun, 17 Oct 2004 11:41:54 -0700
> From: David Trimmell <humanb@xxxxxxxxxxxxxxxxxxx>
> To: 'High Voltage list' <hvlist@xxxxxxxxxx>
> Subject: RE: Fluoroscope (fwd)
>
>
> Hi, well I have set everything up and used those screens I got from
> Steve Roys all those years ago, and have some pictures. I found that the
> X-ray screens take a minimum of 4 R/Hr. to fluoresce, and become quite
> visible at over 15 R/Hr. I must say that I was somewhat surprised at
> just how much radiation is put out by an x-ray tube. I was running at
> around 40KV (half the ratting of the transformer) and with about 5 Volts
> on the tube filament, I get over 140 R/Hr. at 6". No toy here folks.
>
> Well here are the radiographs I took:
>
> http://www.chaoticuniverse.com/webdoc3.htg/Nuclear_Stuff/X-Ray_stuff/X-r
> ay_system/10-16-04_Radiographs/
>
> Regards,
>
> David Trimmell
>
> Note: I certainly was not "holding" the camera! Everything was done
> remotely. I hope no one tries this without proper training in radiation
> protection and correct dosimetry and radiation detection equipment.
>
> ---------- Forwarded message ----------
> Date: Sat, 9 Oct 2004 15:03:54 -0700
> From: David Trimmell <humanb@xxxxxxxxxxxxxxxxxxx>
> To: 'High Voltage list' <hvlist@xxxxxxxxxx>
> Subject: Fluoroscope
>
> Hi all, I will shortly be receiving a nice dental X-Ray transformer with
> tube and filament transformer to go with it. This will be setup as PSU
> for some vacuum experiments, but will also be used with the x-ray tube
> to some x-ray experiments. One such thing I will want to try is a
> Fluoroscope. I will, of course, be using proper Health Physics controls
> and am aware of the hazards. There will be no exposure of "live" tissue.
> But does anyone know of a source for the properly doped Zink Sulfide
> phosphors, or strontium aluminate's? Has anyone here actually made a
> Fluoroscope? I have no intentions of viewing this directly, as I will
> use either a video camera or a reflected image. Believe me I have no
> intention of sticking my head in a potentially lethal x-ray field. Any
> suggestions would be great.
>
> Thanks,
>
> David Trimmell
>
>
>