~26-
on the plates, 1,070 c/m after the addition of 1 ce of .5%
oxalate (dried sample), and 15 c/m with the aluminum foil.
On the basis of the above observations, the total count
on the flamed oxalate plates, after subtraction of the count
contributed by Fe? and Zr? -Nb?>, was considered to be due to
Fe,
Because some self-absorption occurs, even on the flamed
plates, the value of 250,000 d/m of Fe>> in the oxalate fraction is probably a conservative estimate,
The next elution peak for sample II occurred in the ammonium citrate pH 3.5 fractions d through 1.
(Pig. 7) contained
7
The
7
spectrum
peaks of Co?’ (.12 MEV, 12,900 dfn),
CoS (.81 MEV, 4,130 dfn), Co? (1.17 and 1.33 MEV, 13,400 a/n),
and 2n©5 (.51 and 1.12 MEV, 78,100 d/m).
were made from the sample and a maximum
was observed.
Mass absorption curves
PB
energy of .34 MEV
This is in agreement with the reported B energies
for Co?! (.26 MEV PB * 1008), C028 (.48 MEV pt 15%), Co? (.31
MEV B~ 100%), and zn°> (.32 MEV B * 2.58).
‘he observed B
count of 12,600 c/m in the fraction was identical with the B
count calculated on the basis of the
7
count,
The last peak observed in the elution curve for sample ITI
occurred in the ammonium citrate pH 4.1 fractions a and b.
the basis of a low
B
to
7
of 1.0 MEV, and a strong 7
ratio, an observed maximum B erergy
peak at .84 MEV (Fig. 7), the isotope
was identified as Min? (8,200 dfn).
A subsequent re-elution of
the 4.1 fraction according to the method of Kraus and Moore (1953)
confirmed the presence of Mn34 which in this method is eluted by
12 Mand 6 M HCl.
detected,
A trace of C02? +58, 60 contamination was also