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Re: Looking for vendor-polyethylene pig for neutron source
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
>
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