-19The 1.17 and 1.33 MEV peaks are identical with those of
60° and the fraction was tentatively identified as containing
several cobalt isotopes (co?’,"
60°, and an unknown with a 7
.12 MEV; 6028 |
51,
peak of 1.0 MEV).
.81 MEV;
The B emis-
sion from the fraction had a maximum energy of .35 MEV and aprprox-
4dmates the maximum
#8
energies of Co?! + 58, 60 (Co?? .26 Mev
Bt
100%; Co" 48 Mev BP * 15%; 00% .31 MEV PB ~ 100%). 60°%, wnten
might be confused with 028 with regard to half life and its .84 7
emission, was not present.
its higher energy
7
The 1.5 MEV
#
* (100%) of Co 56
and
peaks were not detected.
Further tests were run on the so-called cobalt fraction to
determine if the
7
peaks identified as Co’, 6078, and 6o°°
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 ¢-hfraction by two different techniques in which
duplicate samples were used for each method.
5,330 cAn B
A total count of
(counted in the methane gas-flow chamber) was pres-
ent in each sample,
(1)
Separation
of cobalt by the @ -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