FISSION PRODUCTS IN THE ATMOSPHERE AND RAIN
611
Table 1—'5Sb AND *Sr‘IN THE NORTHERN ATMOSPHERE,
JULY-SEPTEMBER 1962
_
Sampling
dates
July
July
July
July
13
26
26
27
Sept. 7
Sept. 7
to
to
to
to
21°N
64°N
64°N
35°N
67 to 73°N
61°N to 67°N-
August*
August*
August*
30S|
dis; min
per i1u3 scf
dis;min
per 103 scf
125Sb /MSr,
curie’curie
65.5 to 66.5
45
66.5
67.3 to 67.7
339
346
1820
1870
447
336
430
595
0.76
1.03
4.2
3.1
64 to 60
62.5 to 63.6
1750
2100
407
447
4.3
4.7
762
5900
163
454
735
59
1.7
8.0
2.8
Altitude,
10° ft
Latitude
15
61
61
31
125Sh ,
31°N
31°N
31°N
60
71
88
*Balloon sample, from report by Salter.!?
Table 2—CONCENTRATIONS* OF !44Sb, 125Sb, AND Sr IN THE NORTHERN
ATMOSPHERE BETWEEN 60 AND 72°N IN 1963
Sampling Altitude,
dates
103 ft
Jan, 22
Jan. 24
65
45
124Sh
125Sb,
*Sr,
dis/min
per id®scf
dis/min
perl03scf
dis /min
per 103 scf
124Spb / Sr
curiescuriet
125Sb /MSr,
curie;scuriet
{< 1,000)
{<150)
2,560
450
4,360
420
(<Q,30)
(<0.30)
0.56
0.96
33
46
(35)
516
495
Apr. 16
25
Apr. 16
30
35
(86)
1,000
1,010
Apr. 16
Apr. 16
Apr. 16
45
55
65
496
18,400
15,600
2,750
4,870
2,440
July 16
July 16
July 16
40
50
60
49
764
5,720
Sept. 3
Sept. 3
55
65
Sept, 22f
43
Apr. 16
Sept. 5
30
1.22
(0.23)
1.12
2,400
5,330
2,380
0.60
10.3
21.5
1.23
0.98
1,11
562
1,470
3,055
597
1,700
3,320
0.75
4.0
15.7
1.07
0.98
1.04
690
2,240
1,600
1,780
1,570
1,705
23
6.4
21.0
(<0.4)
1.24
1.22
(13)
117
135
(2.0)
1.03
(<1)
22
(0.28)
1.06
1.22
*For values in parentheses, the standard deviation for counting exceeds 20%.
tCorrected for decay to Jan. 1, 1963.
t Latitude, 41 to 44°N.
Thus the most likely source for the excess '°Sb seems to be
second-order neutron capture in '"*Sb. More than one yearafter collection, the samples with high 125Sb still contained a measurable quan-
tity of '4Sb, which indicates that originally very large amounts of !*4Sb
were produced. The high “Mn content shows that structural or other
materials of the nuclear device were exposed to very high neutron
fluxes. Calculations on the neutron flux in a thermonuclear explosion
hae.