pt cmnal ‘Maat oon sdaastaSa
tte
Llows:
These calibrated
sclutions
(i1.e., Radiochemistry Center,
are available from a number of sources
IAEA, Nuclear Chicago)
969
brated at HASL.
68
and the reported value is very good.
id~
directly,
itude
he
listed
the agreement between HASL’s measurement
HASL does not calibrate for Pb
and the supplier's value is accepted.
for Po-210,
-he
Generally,
and are recali-
210
HASL does calibrate
and its evaluation of the Po-210 in a
Pb-210
standard is
now adopted rather than the equilibrium value from the Pb-210.
The results of the quality control program for the October 1969
mission are summarized in Table 3d.
The standards indicate that the
average accuracy of analysis is within +10% or less.
The blank anal-
Jara-
yses indicate that the contamination introduced by normal handling
‘form=
and laboratory procedure is either unmeasurable or insignificant for
all the nuclides studied.
The duplicate samples show that the preci-
sion error Of analyses is generally less than +10% except when the
counting error of the measurement becomes the major uncertainty.
lal—
A serious exception to this general statement on analytical preds,
cision is the Pu-238 and Pu-239 results from sample 2476 which differ
widely from the results of its duplicate 2458.
While plutonium con-
centrations and ratios from sample 2458 appear reasonable for the
region of the stratosphere from which it was collected, they do not
Ir - 15