Table 5. Radionuclides measured
radiochemically except as noted.
Values or
in
soil
standard
samples.
Al!
analyses
done
Radionuclide (pCi/kg)
laboratory
905,
I 375
239+240p,,,
241 am
WOSC, OSU?
EMLP
88.74 4.1% (3)
LLNLS
--
35.8 + 3.8% (8)
36.9 43.7% (3)
--
36.4 + 5.4% (10)
3468 + 9.8% (3)
37.4 + 0.6% (2)
15.5 + 7.2% (4)
14 4.7% (3)
_
Certified
36 + 10%
36 + 10%
16+ 10%
89 + 10%
NOTE: Numbersof replicates are in parentheses.
@ Western Oregon State College, Oregon State University.
Environmental Measurements Laboratory.
© Measured by gamma-ray spectrometry.
d Lawrence Livermore National Laboratory.
intercalibration
exercise,
the
measurements
were
well
corroborated.
These
known
additions of radioactivity were used to establish the expected radioactivity. Second, all
the standards except the terrestrial animal standard were analyzed radiochemically. The
results of these analyses are shown in Tables 4-6. The laboratories at WOSC and Oregon
State University (OSU) have collaborated for several years and their results are
combined. Corroborating analyses were performed by EML and LLNL. The radiochemical!
methods at WOSC and OSU have been demonstrated for the measurement of 1376,
23942405. and 241
Am (see Ref. 4), and the measurements of those three radionuclides
were taken as the certified values. Because the WOSC, OSU measurement of 705, had not
been demonstrated, we used the analyses of EML to certify the 905. As Tables 4-6 show,
excellent agreement was found for all radionuclides.
In Table 7 we present only the
expected values for the terrestrial animal standard because it was prepared by the same
method as the vegetation and marine organism standards by adding known amounts of the
radionuclides. Consequently, no radiochemical analyses were required. We are confident
that the certified activities, or expected values in the case of the terrestrial animal
standard, are correct within the tolerance quoted in Tables 4-7. This has been further
laboratories.
STREETTRIENaas Lene Fee
demonstrated by the high degree of compliance by two of the three participating