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Available from: NC State University Archives Publicly-accessible URL: http://www.lib.ncsu.edu/archives/etext/engineering/reactor/murray/ Nuclear Reactor Digitization Project Raymond L. Murray Reactor Project Notebook Prepared for the NCSU Libraries Science and Technology Electronic Text Project. Spell-check and verification made against printed text using Notetab spell checker. The lineation of the manuscript has been maintained and all end-of-line hyphens have been preserved. The images exist as archived TIFF images, one or more JPEG versions for general use, and thumbnails. Keywords in the header are a local Electronic Text Center scheme to aid in establishing analytical groupings. ID elements are given for each page element and are composed of the text's unique cryptogram and the given page number, as in NEprop033050a for the title page of Clifford Beck's Proposal.
During recent trip to Most of the radioactive work is done in hoods rather than dry boxes,January 2, 1951 letter from Raymond L. Murray to Clifford K. Beck
of the
PHYSICS DEPARTMENT
FOR OFFICIAL USE ONLY
Campus
Radioactivity Laboratories
with various people and inspecting the X-10 Laboratories.
of the supervisors of particular research and development groups.
Hoods: gas disposal
although the latter are gaining favor. There are two ventilating
tems
gases are blown up a stack local to the building.
(b) That for reaction vessels (the "off-gas" system) in higher
activity isotope preparation and research. This goes to a precipitron
(Trion) and in turn to a stack. The gas from the surrounding hood is
again blown to a stack.liquid disposal
Two drainage systems distinguish the strongly active and weakly active
waste solutions. The former goes to the pile canal system, which uses
sand filters in conjunction with evaporators. Back washing at periodic
intervals cleanses the sand. Tank forms are used to store active
centrate
is fed in after the filtration. In some hoods, there are two levels of
the floor, the "semi-hot," built up above the level of the "hot."
Shielding
For low level hoods, only glass is used; for higher level, lead bricks
are piled in front of the working equipment with corners knocked out
to admit controls, auxiliary lines, etc.; for very high levels the lead
(6") is permanent, with narrow vertical slots every so often, filled with
bricks, but leaving access. Remote manipulators are not used extensively
except in the packaging of isotopes, where mirrors and gear-control
mechanisms operate behind a high, thick lead wall.
Construction
The most effective hood is the all stainless-steel type made by
(see
50-100 ft/sec face velocity, with openings near the front, blower in
back at top.
FOR OFFICIAL USE ONLY
Movies were taken of smoke trends with different designs, until this was
evolved. It is quite expensive - around $2,000, including blower. An
mental
chicken screen and sprayed with white paint (this was called "cocoon"). As such,
it was much lest costly than the stainless steel type. Other reputable commercial
vendors are
After learning of our needs and budget, the
we visit or have visit
laboratory
equipment, and adopts a philosophy of never letting radioactive material contaminate
extraneous surfaces.
As examples of his techniques, the following were mentioned:
type, need not be decontaminated
manipulators.
2 yrs., which indicates the care used in handling material.)
sections; can buy one, two, or
as many as needed.Amerkote
Headquarters in
in
+% particulate matter.