450°C for approximately 72 h. The ash was then homogenized and the necessary aliquots
were packaged, labeled, and forwarded for analysis.
Marine Sediment Duplicates
Marine sediment samples were processed somewhat similar to soil. After being wet
weighed, they were dried in ovens at 90°C, reweighed, and then homogenized with a
shaker-type ball mill. Aliquots were taken, the samples appropriately packaged and
labeled, and then forwarded for analysis.
EVALUATION OF DATA
A high degree of compliance with our QC criteria was achieved in this project.
Over 83% of the samples analyzed were found acceptable for dose calculations. As shown
in Table 8, 97% of the 10,685 analyses requested of EAL, 45% of the 4,152 analyses
requested of EIC, and 98% of the 1,445 analyses requested of LRE were accepted.
The
reproducibility of the analyses is particularly apparent in Figs. Al-A45 (Appendix) that
show most of the data clustered about an ideal line. The DCDs that are unacceptable do
not meet the QC standards and are not certified to be used for dose assessment.
Table 8. Summary of the Northern Marshall Islands Radiological Survey radiochemical
analyses.
Laboratory
Number requested
Number accepted
10,685
10,379
Environmental Analysis Laboratory
Eberline Instrument Corporation
4,152
1,863>
Laboratory of Radiation Ecology
1,445
1,410
16,282
13,652
TOTAL
® Includes duplicates and standards.
b Approximately 38% performed by Environmental Analysis Laboratory.
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