TABLE 4.1
ACTIVITY PER UNIT AREA FOR
SKIFF STATIONS, SHOT CHEROKEE
No fallout was collected on the skiffa omitted from
the table.
Approximate
Station
Dip counts/min at H + hr
AA
TABLE 4.2
I.
3,094
196.6
2.5 x 10%
4,459
9,885
150.3
214.2
2.8 x 104
8.7 = 10!
5,720
858
8,783
452
196.2
196.1
214.0
432.0
4.6
6.9
7.7
8.0
BB
3,084
GG
BH
MM
vv
cc
DD
196.6
Measurement
Instrument
Station location, ships
—_
A-C
Time of arrival
TR
Station location, skiffs
Comments
+500 to 1,000 yards,
_
£1,000 yards.
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.
Arbitrary selection of significant increase
above background.
A-C
Time of arrival
Ic
A-D
Time of arrival
TOAD
A
A-C
Time of peak ionization rate
Time of peak fallout arrival rate
TIR
Ic
D
Time of cessation
TR
B-D
Time of cessation
1c
Cc
Tonization rate, in situ
TIR
Cc
Cc
N
B
Apparent ionization rate, in ocean
Apparent ionization rate, in tank
Tonization rate, above sea surface
Ionization rate, in situ
SIO-P
SIO-D
NYO-M
T1B, Cutie Pie
c
N
Total dose
Total dose
D
D
‘
Weight of fallout/area
Fraction of device/area (Fe, U)
.
Original coral-sea-water
:
,
Rate plot for protracted fallout and fallout
TR
ESL film pack
D
Fiasions and fraction of
device/area (Mo™)
Fissions /area
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 interchamber 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 sources.
See above: Ionization rate, TIR.
Assumed « 20 percent.
occ
Bias uncertainty (Section 4.3.2); variability
occ
of background collections; see below: Elemental composition, fallout.
Bias uncertainty (Section 4.3.2); uncertainty
of indicator abundance in device surround-
inga; see below: Elemental composition,
fallout.
occ
Variations in atoll, reef, and lagoon bottom
constituents
c
x 10%
x 10"
x 1018
x 10°
EVALUATION OF MEASUREMENT AND DATA RELIABILITY
A
D
2.5 x 10!
Field Measurements and Deposition Properties
Class
A
fiasions/t?
composition; see below: Elemental compo-
sition, fallout.
Bias uncertainty (Section 4.3.2); device fission
occ
SIO-P, dip
yield uncertainty.
Uncertainties in dip to fission conversion
factor, ocean backgrounds, fractionation
of radionuclides, motion of water; see above:
Apparent ionization rate, in ocean.
124