"sl eatee. peltan
All of the values reported by the contractor are corrected for a
reagent biank.
sc
that the blank values reported here reficet
the con
handling at HASL and at the contractor laboratory.
Table 1 lists the results cf the analyses of the blanks for each
nuclide.
In general these data indicate low levels of contamination
for most of the nuclides,
however it is significant to note that the
average Pu-238 biank rose from C.C04 dpm in 1967
a
Because
the amount of Pu-233 found ir
quentiy in
to 9.22 dom in 1968.
surface air sampies is fre-~
the range of 1 dem this blank may represent a significant
fraction of the total activity.
The results of analyses on standard samples are shcwn in Table 2.
J
These data are indicative of the accuracy cf the radiochem.cai analyses.
The values shown are the average percert deviaticns between
added activities and the results reported by the contractor.
most of the results are satisfactory,
tive bias in the
there appears
the
Aithough
tc be a large pesi-
Pu~238 values for mich of 1968, which cannot be ac-
counted for by the increase of the blank ccntamination.
Samples sub-
standard solution do not exhibit this bias,
and it is therefore
iT
mitted to the contractor during 1969 which were prepared with a new
pre-
bable that the pcoor results reflect a degeneration cf the Pu-233 star~
dard solution used for the preparation of the 1968 quality centrol
samples.