TABLE 4.]
ACTIVITY PER UNIT AREA FOR
SKIFF STATIONS, SHOT CHEROKEE
No fallout was collected on the skiffs omitted from
the table.
Station
TABLE 4.2
I.
fissions/f2
AA
BB
cc
DD
3,094
3,094
4,459
9,885
196.6
196.6
150.3
214.2
2.5
2.5
2.8
8.7
x 10"
x 104
x 10
x 104
GG
HH
MM
vv
5,720
858
8,783
452
196.2
196.1
214.0
432.0
4.6
6.9
7.7
8.0
x
x
x
x
10%
10°
10
10°
EVALUATION OF MEASUREMENT AND DATA RELIABILITY
Instrument
Measurement
Station location, ships
Station location, skiffs
Time of arrival
—_
A
A-C
A-C
Time of arrival
1c
A-D
Time of arrival
TOAD
A
Time of peak ionization rate
Time of peak fallout arrival rate
Ic
D
Time of cessation
TR
B-D
Time of cessation
Ic
c
Tonization rate, in situ
TR
A-C
Approximate
Field Measurements and Deposition Properties
Class
A
Dip counts/min at H + br
_
TIR
TIR
Comments
£500 to 1,000 yards.
+1,000 yards.
Arbitrary selection of significant increase
above background.
Uncertainty in first tray significantly above
background; arrival uncertain within time
interval tray exposed.
Uncertain for initially low rates of field
increase; malfunctions on skiffs; clockreading difficulties.
_
Uncertain for protracted fallout duration and
sharp deposition rate peaks.
Depends on knowledge of decay rate of
residual material.
Rate plot for protracted fallout and fallout
with sharp deposition-rate peaks may continue to end of exposure period; cumulative
activity slope approaches 1.
Poor directional-energy response (Appendix
A.2); variations in calibration; poor inter-
Cc
c
N
B
Apparent ionization rate, in ocean
Apparent ionization rate, in tank
lonization rate, above sea surface
Tonization rate, in situ
SIO-P
SsIO-D
NYO-M
TB, Cutie Pie
c
N
D
Total dose
Total dose
Weight of fallout/area
TR
ESL film pack
occ
D
Fraction of device/area (Fe, U)
.
,
occ
D
Original coral-sea-water
constituents
occ
c
Fissions and fraction of
occ
D
Fiasions /area
SIO-P, dip
device/area (Mo™)
chamber agreement.
Calibration variable, mechanical difficulties.
Calibration variable, electrical difficulties.
High self-contamination observed.
Calibration for point source in calibration
direction; readings ~ 20 percent low above
extended source.
See above: Ionization rate, TIR.
Assumed + 20 percent.
Bias uncertainty (Section 4.3.2); variability
of background collections; see below: Elemental composition, fallout.
Bias uncertainty(Section 4.3.2); uncertainty
of indicator abundance in device surround-
ings; see below: Elemental composition,
fallout.
Variations in atoll, reef, and lagoon bottom
composition; see below: Elemental composition, fallout.
Bias uncertainty (Section 4.3.2); device fission
yield uncertainty.
Uncertainties in dip to fission conversion
factor, ocean backgrounds, fractionation
of radionuclides, motion of water; see above:
Apparent ionization rate, in ocean.