~19The 1.17 and 1.33 MEV peaks are identical with those of
650° and the fraction was tentatively identified as containing
Co98, 151, .81 MEV;
several cobalt isotopes (Co?’, .12 MEV;
60°;
and an unknown with a
Y
peak of 1.0 MEV).
The
emis-
B
sion from the fraction had a maximum energy of .35 MEV and approx
PB
4mates the maximum
B
energies of Coo! » 58, 60 (co? .26 MEV
+
1008; Co>8 .48 MEV B * 15%; Co .3: MEV P ~ 100%). 60%, which
might be confused with C028 with regard to half life and its .84 7
56
emission, was not present.
its higher energy
7Y
The 1.5 MEV
BP
+ (100%) of Co?
ana
peaks were not detected.
Further tests were run on the so-called cobalt fraction to
determine if the 7
peaks identified as Co?! , 6058 , and 9°?
could be separated by chemical or further resin column treatment.
The cobalt fraction was divided into two samples -- pH 3.3 c-h |
and pH 3.3 1-p -- so that both the leading edge and the trailing
edge of the peak could be examined independently.
Confirmatory chemical separations for cobalt were made on
the pH 3.3 c-h fraction by two different techniques in which
duplicate samples were used for each method.
5,330 c/n PB
A total count of
(counted in the methane gas-flow chamber) was pres-
ent in each sample,
(1)
Separation
of cobalt by the a@-nitroso- B-naphthol
precipitate technique (Hillebrand and Lundell, 1953).
original 5,330 c/m B
c/m B
From an
in the samples, totals of 1,390 and 1,510
were counted in the cobalt separations.
Gamma spectrum
curves made from the separations were essentially the same as
those of the original sample except the peaks were steeper and
2
rn
vid