Table 8.
Comparison of radiochemical results from separate samples of a largevolume soil specimen.
(Ratios are A to B sample aliquot) .4
Master log
number
240
40: 23984
241 : 23904
239 5K
2394240,
atom ratio
atom ratio
dpm/g
dpm/g
243
Pu
dpm/g
241
90
Am
dpm/g
Sr
dpm/g
Bikini soil
O01-0065-01
1.01 40.4%
1.21 42.1%
1.02 +0.8%
1.02 20.6%
1.23 42.2%
01-0088-9]
1.01 40.9
0.86049.3
1.03 40.9
1.03 40.8
0.88329.4
0.90928.6
0.98742.1
0.968t1.1%
0.99041.7
01-0111-01
0.998+0.6
1.09 42.8
1.00 +1.6
1.00 41.3
1.10 £4.4
O1-0134-32
0.98542.5
0.90 +15
0.92744.3
0.920£3.3
0.84546.5
-
01-0157-32
1.01 40.3
1.03 40.9
1,00 40.5
1.01 40.4
1.03 41.2
—_——
1.00 40.7
O1-0180-32
0.99741.1
0.93044.8
1.00 40.8
0.99840.9
0.93044.9
—_—
9.99842.4
O01-0226-32
1.01 £0.4
1.01 40.8
0.99540.5
0.99940.4
1.01 +1.0
_
01-0318-95
0,992#2.2
01-0343-90
0.99840.8
0.955+1.3
1.04 +2.2
1.04 41.9
0.99342.6
O1-0387-95
0.9844#2.2
0.99 +28
1.06 3.6
1.05 +2.4
1.1
O1-0525-71
1,01 40.8
1.16 47.4
0.95641.3
0.95941.0
O1-0548-72
0.984+3.5
1.07 46.1
1.06 44.2
01-0617-92
1.01 41.2
1.06 44,4
1,03 40.9
1.04 +0,.9
1.09 +4.5
1.0041.1%
1.0411%
1,01£4.0%
1.0144.0%
1.0411%
06-0709-32
0.99441.1%2
0.91 411%
1.01 40.9%
' Average
1.03 +4.0
0.95044.5
1.03 £2.4
0.985£2.0
0.970£3.3 0.96522.7
1.04 40.8
1.08 46.4
0.96542.6
428
0.95110.9
1.11 £7.5
—_———
1.03 $2.6
—
1.02 43.4
0.99248.6%
0.99743.22
Eneu soil
1.01 40.9%
0.92 111%
_olcl
1.01 41.9%
06-0755-32
0.978+3.8
1.05 +2.4
1.04 #2.6
_—
1.08 +6.5
06-0893-92
1.02 +1.5
——-
0.96141.4
0.97141.3
—_——
_
0.98846 .3
Average
0.99742.1%
———
1.0144.4%
1.0143.4%
—_—-
—_—_
1.0344.7%
* All results are reported to a reference time of 1 January 1975 (001.00 2, 75).
7241
signal or calculation of a detection
limit.
Wet-chemistry measurements
served two purposes:
Am concentration more accurately.
Uncertainties in self-absorption
to permit
corrections because of voids resulting
comparison of two different methods
41an,
for measuring
and for other
can limit the accuracy of 241oy
samples,
assessment via gamma spectrometry.
from settling of the soil in the
to provide greater sensitivity
for detecting
ereo than available
Thus,
from routine gamma measurement.
41
Am data
for soil samples reported via gamma
Comparison data for 52 soil samples
are presented in Table 9.
it appears that the
The mean
spectrometry may be systematically
low by about 20 percent.
Even so,
value for the MCL:LLL ratio is.
the effect of -a 20 percent bias will
1.2 + 164, with evidence for signifi-
be negligible on the estimated exter-
cant bias.
nal dose since
For soil samples, wet
very small fraction to the total.
chemistry is expected to assess the
~16-
a]
J010098
Lam contributed a