Memorandum from Raymond L. Murray to Clifford K. Beck
OFFICIAL USE ONLY
TO: Clifford K. Beck Information from Oak Ridge, Feb. 15-17
FROM: Raymond L. Murray
CC: N. Underwood
A. C. Menius
1. Called E. P. Blizard of ORNL, who is probably the best authority on shielding.
The relaxation lengths quoted in ORNL which I have noted are for fast
neutrons, and represent the reduction in intensity as measured by thermal
neutron counters. Barytes is probably the best bet for our use, with a [lambda]
of 8. A report by Lansing, Thornton and Lane on MTR shielding will be out
soon, and is most appropriate for our study, according to Blizard. There is
to be a meeting with some Canadian people on the week of Feb. 26, in which
ORNL will describe the whole picture of shielding, particularly of the
inexpensive variety for permanent reactors. He highly recommends that we
attend this, and will call or telegraph the exact date(s) of the meeting.
2. Discussed several items with A. D. Callihan.
- (a) Reactor building design. He objected to the cut-up center rooms,
suggesting one large room with partitions if desired. Provisions
for women’s dressing rooms are needed. Also, the dressing rooms
should be off the traffic line, because of the visitors that are
sure to come around to see the labs. He liked the sizes of the rooms.
- (b) Water window. Callihan thinks it should be made in panels of reasonable
size, and of stainless steal to avoid rust. Urges solid live rubber
gaskets rather than caulking, addition of a salt in the water to inhibit
organic growths. Their windows are truncated pyramids 5' 6" square on the
front (near reactor), 3 1/2' x 2 1/2' on bask. Glass thickness 1 1/4"
front, 5/8" back of "Herculite" a tempered glass put out by Pittsburgh
Plate Glass Co.
- (c) Cd vs. B shielding at the end of the thermal column. He agreed B would