RE: possible sources for sheet lead and mineral/ transformer oil?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "David Trimmell" <humanb-at-chaoticuniverse-dot-com> 

Soft x-rays are significantly "reduced" by many low Z materials. By soft
I would mean <20KeV.

Regards,

David Trimmell

-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Wednesday, October 06, 2004 9:57 PM
To: tesla-at-pupman-dot-com
Subject: Re: possible sources for sheet lead and mineral/ transformer
oil?

Original poster: "Jim Lux" <jimlux-at-earthlink-dot-net>

At 05:47 PM 10/6/2004 -0600, you wrote:
 >Original poster: humanb-at-chaoticuniverse-dot-com
 >Hi, well I looked up the price for sheet lead at McMaster Carr and here
is
 >what I found:
 >
 >12" x 24" X 0.042" are $19.56 Each. Part Number 9032K119.
 >
 >I am also going to be doing some radiation shielding and would like to
 >note that this thickness of lead is just over two "tenth value"
 >thicknesses (0.039") for 70 KeV x-rays. What this means is that one
layer
 >of this material will reduce the radiation levels by 100, for instance,
if
 >you have a tube putting out 10 R/minute this will reduce the exposure
rate
 >to 100mR/minute. Then use the inverse square law for exposure at a
given
 >distance.
 >
 >Also remember that it is a very good idea to ware safety glasses when
 >experimenting with Tesla coils and vacuum tubes, as they protect
against
 >not only shattering glass, but also against "soft" x-rays. Soft x-rays
can
 >cause cataracts in the cornea.

Uhh... which safety glasses will stop soft x-rays?  The usual
polycarbonate
won't stop much of anything energetic (except perhaps neutrons, which it

might slow down a bit).  Most glass won't stop xrays, unless it's been
loaded with something (iron, lead, etc.).