[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: Looking for vendor-polyethylene pig for neutron source
Sorry, Bill.
you have lost me.....
The guy is looking for shielding for a Cf source, not a neutron generator
(fun little devices used pretty extensively in the oil E&P business for
downhole logging applications.....)
Doug
At 02:24 PM 11/11/2003 -0500, William V Lipton wrote:
>What you want is a "neutron howitzer. There are two vendors for this listed in
>the "Nuclear News Buyers Guide 2003."
>
>J. L. Shepherd & Associates: 818-898-2361, www.jlshepherd.com
>
>Thermo MF Physics: 719-598-9549, www.thermomfphysics.com
>
>The opinions expressed are strictly mine.
>It's not about dose, it's about trust.
>Curies forever.
>
>Bill Lipton
>liptonw@dteenergy.com
>
>
>Doug Aitken wrote:
>
> > At 09:21 AM 11/11/2003 +0200, you wrote:
> > >Bobby,
> > >Traditionally a sturdy drum filled with wax (optional borax added) was
> > >often used with a source-sized hole down the middle to store a neutron
> > >source. If that is considered a fire hazard, water (again with borax
> > >optional) could be considered. If most of the (thermalized)neutrons are
> > >captured in boron, the gamma energy is about 480 keV, compared with the
> > >rather penetrating 2.22 MeV if captured in hydrogen.
> > >Chris Hofmeyr
> >
> > Building on this, a highly effective shielding (and very cheap compared
> > with boron-loaded poly) can be made by filling your shield with borax
> > granules and hydrating them to allow formation of a crystal lattice.
> > Borax technical grade granules can be obtained from many vendors - e.g. Van
> > Waters & Rogers here in Houston. Make sure to get true Borax, B037441 is
> > this company's order number, (sodium tetraborate decahydrate, also referred
> > to as 10 mol by this vendor).
> > Fill your shield half full with tap water. Pour Borax granules into the
> > shield, dispersing when it piles up above the water level. Maintain the
> > water level above the Borax granules at all times. As the shield fills,
> > Borax will displace the water which will run out of the shield as the
> > granules take their place. Stir the mixture to ensure that air does not
> > become trapped. Continue filling the shield until all water is displaced
> > with borax and the shield is completely filled. The Borax granules will
> > pack into a solid cake and will remain moist. Allow the shield to sit for a
> > minimum of 48 hours to allow the water and borax to settle and also allow
> > the borax to crystallize.
> >
> > Regards
> >
> > Doug Aitken Schlumberger Drilling and Measurements QHSE
> > Advisor
> > Phone (Sugarland): 281 285-8009
> > Phone (Home office): 713 797-0919
> > Phone (Cell): 713 562-8585
> > Principal E-mail: jdaitken@earthlink.net
> > Schlumberger E-mail: daitken@sugar-land.oilfield.slb.com
> > Mail: 300 Schlumberger Drive MD2, Room 111
> > Sugar Land, TX 77478
> >
> > ************************************************************************
> > You are currently subscribed to the Radsafe mailing list. To
> > unsubscribe, send an e-mail to Majordomo@list.vanderbilt.edu Put the
> > text "unsubscribe radsafe" (no quote marks) in the body of the e-mail,
> > with no subject line. You can view the Radsafe archives at
> > http://www.vanderbilt.edu/radsafe/
Doug Aitken Schlumberger Drilling and Measurements QHSE
Advisor
Phone (Sugarland): 281 285-8009
Phone (Home office): 713 797-0919
Phone (Cell): 713 562-8585
Principal E-mail: jdaitken@earthlink.net
Schlumberger E-mail: daitken@sugar-land.oilfield.slb.com
Mail: 300 Schlumberger Drive MD2, Room 111
Sugar Land, TX 77478
************************************************************************
You are currently subscribed to the Radsafe mailing list. To
unsubscribe, send an e-mail to Majordomo@list.vanderbilt.edu Put the
text "unsubscribe radsafe" (no quote marks) in the body of the e-mail,
with no subject line. You can view the Radsafe archives at
http://www.vanderbilt.edu/radsafe/