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

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

Original poster: "Jack Vandam" <snotoir7674g-at-mindspring-dot-com> 

Hi David,

Thanks for the tenth value physics review!  That brings back memories of
college days when we used to solve problems like that.

My "best friend" that I have with me during any radiation experiments is
either one of my two scintillation detectors.  The one is especially suited
to x-rays and uses a NaI type crystal in a thin rubber case to cut out
light.  If I point the probe at the bulb, for example, while it is
generating x-rays, even with the house, brick wall and air in between, it
will still pick up some of the x-rays, which is something the regular Geiger
probe fails to do.  Now if I really want to get fancy, I have a large piece
of scintillation plastic that is actually too sensitive for normal use, but
ideally suited for contamination measurements on a miniscule scale one the
background level is removed.

Probably standard glass goggles might help some if they are within the bulbs
visible radius or there is insufficient shielding.  The x-rays can scatter
quite a lot so the goggles could be helpful.  Thanks for the pointer.

Jack

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Wednesday, October 06, 2004 7:47 PM
Subject: Re: possible sources for sheet lead and mineral/ transformer oil?


 > 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 $19.56 Each. Part Number 9032K119.
 >
 > I am also going to be doing some radiation shielding and would like to
note
 > that this thickness of lead is just over two "tenth value" thicknesses
 > (0.039") for 70 KeV x-rays. What this means is that one layer of this
 > material will reduce the radiation levels by 100, for instance, if you
have
 > a tube putting out 10 R/minute this will reduce the exposure rate to
 > 100mR/minute. Then use the inverse square law for exposure at a given
distance.
 >
 > Also remember that it is a very good idea to ware safety glasses when
 > experimenting with Tesla coils and vacuum tubes, as they protect against
 > not only shattering glass, but also against "soft" x-rays. Soft x-rays can
 > cause cataracts in the cornea.
 >
 >
 > Regards,
 >
 > David Trimmell
 >
 > On Wed, 06 Oct 2004 08:05:10 -0600
 >   "Tesla list" <tesla-at-pupman-dot-com> wrote:
 > >Original poster: "BunnyKiller" <bunikllr-at-bellsouth-dot-net> Mineral oil in
 > >bulk can be found at "Feed n Seed" type stores,  used as a horse
 > >laxitive...  comes in 1 gallon jugs.
 > >Sheet lead   thats going to be a bit harder to find   just maybe some of
 > >the older well established hardware stores ( Mom n Pop types personally
 > >owned) might have a stash in the back corner   it was once used as
 > >flashing for roof work.  I think McMaster Carr might carry it ... yes
they
 > >do ( well at least its listed in Cat.101)
 > >a 24"X24"X1/8" piece is 54$    and thats from the old catalog...
 > >Scot D
 > >
 > >Tesla list wrote:
 > >
 > >>Original poster: "Jack Vandam" <snotoir7674g-at-mindspring-dot-com>
 > >>Hi Guys:
 > >>
 > >>Can anyone recommend places where I might find sheet lead and
transformer/
 > >>mineral oil at reasonable prices.  The local drug store has mineral oil,
but
 > >>it isn't cheap and the container is small.  Not sure how much quantity
yet,
 > >>but suggested places to look would be helpful.  Sheet lead is another
item
 > >>that seems harder to find, so any sources concerning it would be helpful
 > >>too.
 > >>
 > >>Thanks,
 > >>Jack
 > >>
 > >
 >
 >
 >