TABLE 2.5 (Continued)
Fre
prea
Bomoay,
Welbourne, Australia
nekong
ta webs Formosa
wo
ourk AcF.Be, Pole
ua
Johnston Teland
French Frigate Shoals
Midway
Wake Island
Canton island
Trakfata
tr
sland
ster
Honolulu
Hilo
M¢ 15
Me 30
e
30
too
20000
isp000
9000
* 990
1300
6300
500
N00,
S300
200
to MIKE,
2)
M+ 61
x
My 61
°
”
80
110
“Ie
peo
00
0000
*AO00o
e008
300
890
Io
“0
_
eye
4000
_
390
260
700
Indis
Tallington, Mow Zealand
x P
rere”
i
w415
Fer the purpose of extrapoiation the activity of all
samples collected auring tne mirvey was arbitrarily attributed
100
2700
00
4500
3200
_
"eo
2700
0
1500
22000
20000
=.
260
70
710
3700
2000
170
250
ibe
1300
30
340
4500
900
to KING.
Cotes Fallout after the First Thirty Daya
Ms 61,
21,00
2900
6304
Figures 2e7 ud Geb show the fal lout from Mb 39 to
In the Unit-uo States the average was -60 d/m/ag ft and
in the reat of the world the averare wee “0. The close agreement
@Qppears to be consistent with the idea that the active particles
had been dispersed throughout the world atmosphere, The impression
of dispersion ie reinforced by the amail range of total fallout,
from Mito M4 61, over the United Statee (Figure 2.9), and by the
fact that measurable fallout occurred, aooner or later, at avery
domestic atation and nearly every foreign station (Figure Zsl0).
2e2el, Sampling Precision
25000
7000
m—=
Data based or sanples collected after the }%sth day
therefore contain an slement of uncertainty because of the
possibility that a significant portion of the activity was due
The error in estimating fallout at a collection station
from an individual sample, as measured by tha coefficient of
variation (ratio of ateandard deviation to mean), computed from _
the firet 250 paire of settled dust samplea, is approximately 50%,
Studies of data from an earlier survey (1,) indicated that the
finding may be applied to a large region surrounding the station
without serious loss of preoision, The figure of 30% includes no
allowance for the efficiency of tre collection method or for
other sources of syatemtio error.
Although the totals shown on the maps ere more precise
shen the dete of individual samplas, they sy be influenced greatly
by exceptional rasulta, auch as the maximum caily fallout at Iwo
Jima, discuesed in Section 2e2el, above,
2e2e5
Radioactive Dust Concentration of the Air at
Tround
Vevel
The concentration of radioactive dust in the atmosphere,
as measured by counts of filtered samples, was negligible compared
to the reaults of surveys made during continental teats. The
“25
maximum for each atetion ie given in Table 24,