0018933
The radiochemical work reported as being done at LASL was performed
in conjunction with diagnostic measurements en the events,
The methods
used were those reported in the Los Alamos compilation of radiochemical
procedures (Reference 66),
The gas samples were analyzed for Kr88, xr85, xr85m and in some
cases for Xe!33,
The rare gas radionuclides were separated from the con-
stituents of the atmosphere and then counted in a gas counter,
The separation
procedure used was developed at UCRL, Livermore, under the direction of
Dr. Floyd Momyer,
Carrier amounts of inactive Kr and Xe were addedto
the air sample and the mixture circulated through a series of traps for purification purposes,
Water and carbon dioxide were condensed out in the first
trap, which was filled with inert packing and held at liquid nitrogen temperature,
The Kr and Xe were abserbed on activated charcoal in a second trap,
also immersed in liquid nitrogen, but the major part of the N>» 0, and A
passed through the trap and were removed,
The Kr was desorbed by raising
the trap temperature to that ef a dry ice-acetone mixture,
Further purifica-
tion was effected by two more absorption-desorption cycles on charcoal at
liquid nitrogen and dry ice-acetone temperatures,
After determination of
the pure Kr yield, it was transferred to the gas counter.
This was the procedure used when Kr alone was the desired product;
ined,
necessary when Xe was alse determ
additional purification steps were
67
PRL
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