x
7.
(
a
oe
ee
(
a
~
.
a
—_
a)
.
“
,
|
~23-
tolerance for the Sr-90/Ca ratio,
("Tolerance4n this case means the
allowable magnitude of the Sr-90/Ca ratio in the human body, 2,2 dpm/gram
Ca.)
Dr. Libby also presented some figures for the tritium content of
rain water from the Philippine Islands and from Chicago.
The values
ranged ‘from 2 to 13 disintegrations per minute per gallon,
In the latter
part of September, after the Russian shots, Chicago rain water rose to
39 dpm/gal.
Chicago tap water, Mississippi River water, and Pacific
Ocean water were 1 dpm/gal or less. Dr, Libby said that the various
indications were not much worse than expected but deserved consideration,
Dr. Smyth asked who was worrying about the missing Mike debris?
Dr. Bugher indicated that all concerned with the Sunshine problem were.
He said that conceivably most of it had fallen out in the Pacific, or
that it might be still stored in the atmosphere.* During the Castle tests
fall-out stations will be maintained on Navy vessels to test the fall-out
question further.
|
:
At this point, Dr, von Neumann, Mr, Murray, Dr, Smyth, and Comdr.
Dunford left the meeting.
Next, Dr, Johnson reported on accelerators and on controlled thermonuclear reactions,
Three proposals were before the GAC for the construction of heavy
Heavy
particle accelerators.
Accelerators
to neon) to energies of about 10 Mev per nucleon so that they could
Particle
The aim was to accelerate heavy ions (beryllium
penetrate the potential barriers of even the heaviest nuclei, and to
study the reactions and reaction products,
UCRL and Yale proposed linear
accelerators, each costing $1.2 million, ORNL a 114" cyclotron costing
$2 million.
Dr. Johnson reviewed the proposals of the Perecawmetipytens
ot
,
|
—~
om
r=
”
~ os
Lolli,
Jar of Trane nes
bm iia
“=
Ta St
.
gs?
OBST Oy
princes
ren blie
os
29