R. P. MILTENBERGER etul.
397
Table {t. Summary of system efficiency and “(DLS for field WBC system
Nuc lide
137
Energy
Efficiency
MDL
37 Bq (1 nCi}
900 sec
8.7 x LO
.
Cs
662 KeV
6%y
=—s«1173 & 1334 Kev
6.7 x 107?
37 Bq (1 nCi)
900 sec
1460 KeY
7.0 x 1072
222 Bq (6 nCi)
900 sec
40y
Two point sources were used in the QC
program. A '’Cs source, which had been
factor of 1.8. The general increase for adult
females from 1977 to 1978 was slightly higher
than that for males over the same period. In
most cases, the 1979 data are significantly
lower than the 1978 data with an average
used by the BNL medical surveys in previous
years, was
used to monitor changes
in system resolution and efficiency as func-
tion of time. A second source, a '""Cs+"Co
point source, was used for zero and gain
reduction in the '’Cs body burden by a factor
of 2.9.
It must be noted that data for adults reported in Tables 2—4 are uncorrected for height
determination.
Replicate counting of Marshallese was
conducted on 5% of the subjects. Results
indicate that the data obtained from the field
and weight differences between subjects and
the phantom. This will have a minimal effect
whole body counting system is reproducible
on adult data (< 15% possible error) (Mi76).
to within plus or minus 6 percent. Almost all
of this error is due to the variability of subject
position.
When
subjects
remain
Body burdens of the children and adolescents
reported in these tables have been corrected
for geometric differences between adult
standard man and the average Marshallese
stationary, the difference between sequential
child.
results is 1%.
An intercomparison of whole body counting systems was conducted between the field
system and the whole body counter operated
Table
results of the study indicate that °’Cs and the
potassium body burdens which exceed the
in '""Cs body burdens from April 1978 to
January 1979 with the reduction in '"’Cs body
burden that was expected as a result of relo-
minimum sensitivity of both systems are in
agreement to within + 5%.
cating the Bikini Population in late August
1978. Values for the expected biological
removal rate constants were obtained from
NCRP Report 52 (NCRP77) and ICRP Pub-
RESULTS
Table 2 is a summary of the whole body
lication 10A (ICRP71).
counting data for "Cs body burdens. Adult
individuals were measured in 1974 (Con75),
RESULTS AND DISCUSSIONS
1977 (Coh77), 1978 and 1979. It represents the
mean, standard deviation and ranges of
values obtained from the sample population.
There is a general increase in the body bur-
The whole body counting data indicate that
previous estimates of the type of food and
amount of various components in the Bikini
diet did not adequately describe the dietary
patterns that existed between 1974 and 1978.
dens of adult males from 1974 to 1977 by a
factor of 13.3, and from 1977 to 1978 by a
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to '’Cs. Table 4 presents the mean, standard
deviation and range of body potassium masses
reported from 1974 to 1979.
Table 5 compares the observed reduction
employees with current whole body counting
records at the Medical Department. The
.
the
tion of “Co to the total body burden relative
'7Cs body burdens plus six Brookhaven
.
represents
was detected but body burdens were not
computed due to the insignificant contribu-
Department. Persons used in the study included nine Marshallese with measurable
’
3
deviation and range of “Co body burden
reported in 1978 and 1979. In prior years. “Co
by S. Cohn for the Brookhaven Medical
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