IN THE ATOLL AREA
TABLE 3.1
TIMES OF ARRIVAL, PEAK ACTIVITY, AND CESSATION AT MAJOR STATIONS
Time of arrival (tg) indicates the earliest: reliable arrival time of fallout as determined from the
incremental collector and gamma time-intensity recorder results. Time of peak activity (tp) indicates the time of peak ionization rate (in parentheses) and the times during which the fonization
rate was within 10 percent of the peak rate. Jy refers to the peak ionization rate. Time of cessalion (t,) indicates, first, the time by which 95 percent of the fallout had been deposited and, next,
the extrapolated time of cessation.
Shot
Flathead
Station
YAG 40 (A, B)
YAG 39 (C)
-
(17.0)
(11.0)
20
13
9.0
(9.1)
9.2 °
11
q.3)
1.5 *
0.62
1.2
(1.52)
1.9
How Island (F)
;
YAG 40 (A,B)
6.0
YAG 39 (C)
2.3
6.8
(6.0)
6.2
YFNB 13 (E)
0.20
0.58
(0.63)
0.73
YAG 40 (A,B)
YAG 39 (C)
3.0
0.68
0.75
3.4
12
LST 611 (D)
YFNB ‘13 (E)
YFNB 29 (G, H)
How Island (F)
t
0.33
0.32
0.38
YAG 40 (A, B)
4.4
YAG 39 (C)
2.0
LST 611 (D)
7.0
YFNB 13 (E)
0.25
YFNB 29 (G, H)
How Island (F)
*
1
}
§
1
TSD, br
6.6
HowIsland (F)
Tewa
12
10
0.35
YFNB 29 (G,H)
Zuni
8.0
4.5
Ip
LST 611 (D)
LST 611 (D)
a
TSD, br
tp
YFNB 13 (E)
YFNB 29 (G, H)
Navajo
ta
0.23
1.6
‘
11
5.6
(12.3)
r/ar
0.97
0.70
0.88
1.6*
1.2
1.4
6.2
(7.2)
1.6
13
1.8
1.4
2.6
(5.0)
(13.6)
5.7
15
(1.9)
(1.7)
(2.9)
Estimated value; gamma time-intensity recorder saturated.
No determination possible; incremental collector failed.
No failout occurred.
Minimum value.
Instrumentfailed.
3.0
2.8%
3.4
}
_
0.22
1.5 to 9.0
t
nes thy
'
04s
.3
;
Raft-3 (8)
0.5
0.057
0.23
0.48
9.11
9.4
Skiff-BB
t
6*
9.6
2.9
44
0.405
Skiff-AA
t
(1.25)
(0.62)
(1.05)
33
.
16 to 20
1.6
(6.7)
(25)
t
{
How Island (i)
15 to 16
1.7
6.2
oa
1.49
0.116
20
.
0.129
1.9
t
°
ow Is.
William Island (M)
0.043
(1.33)
Nang aoOy
20 to 25
0.98
8.5
1
0.038
7.43
20.2
0.256
2.5
40°
2.5
13 to 18
1.9 to 9,0 §
3.2 to 146
TSD, br
t
0.40
0.098
2.0 to f
TSD, br
*
.
George Island (L)
Charlie Island (M)
21.8*
TSD, br
*
0.77
22 to 23
13 to 15
6.7
1.2
(6.1)
TSD, br
TSD, br
YFNB 13 (E)
YFNB 29 (G)
0.259
0.141
t
13
te
Time of arrival (t,) indicates the arrival timy of fullout us dutermined
from the time of arrival detector results.
Shot Flathead
Shot Navajo
Shot Zuni Shot Towa
Station
te
ta
ty
ta
Skiff-CC
Skiff-DD
0.02 Tf
_
.
Skiff-EE
.
t
t
Tt
t
t
t
4.7
t
t
.
.
.
0.
.
0.39
_
T
t
.
3.85
.
_
5.0
Tt
.
4.2
t
3.06
t
t
t
2.06
2.98
*
t
4.5 to 7.06
Skiff-FF
i
t
1.4 to 13
Skiff-GG
*
*
t
1.9 to 9.3
2.4 to 3.3
1.9 to 2.6
Skiff-KK
Skiff-LL
Skiff-MM
Skiff-PP
t
t
*
tT
t
t
4.3
1.4
.
t
2.9
.
t
t
2.0
tT
t
17
t
t
29 to 33
8.5 to 16
6.3 to 16
14 to 18
7.0 to 16
4.3 to 16
3.3 to 9.0
Skiff-HH
Skiff-RR
T
.
4.
t
_
tT
Skiff-SS
10.6
tT
Skiff-TT
j
t
T
Skiff-UU
t
—_
t
Skiff-VV
Skiff-wWW
_
_
ied
_
*
_—
Skiff-YY
_
—_
—_
Skiff-XX
_
—
_
2.2
—_—
ft
1.2
t
* Skiff or inatrument Jost, or no instrument present.
{ Instrument malfunctioned or may have malfunctioned.
} Activity level insufficient to trigger instrument; no fallout or only light
fallout occurred.
§ Estimated value; clock reading corrected by + an integral number of days.
1 Instrument may have triggered at peak; low arrival rate.