SIZE DISTRIBUTIONS OF RADIOACTIVE AEROSOLS
163
Table 3— RADIOACTIVITY DATA FOR 1962 IMPACTOR-- FILTER COLLECTIONS
Sampling-altitude
Concentration on flight date,
dis/min per cubic meter (S.T.P.)
Sr
M0Rg
Tota! beta*
concentration
on counting date,
counts/min x G/m°
(S.T.P.)
interval, km
Fraction
UC
9.1—14.4
Stage 1
Stage 2
Filter
Total
10.340.2
24743
29.8 + 0.5
287 +3
1.53 40.75
9.59 +0.49
1.17 40.22
12.3+6.9
<0.3
0.959 + 0.217
<2.0
2,121.3
88.6 + 0.4
1706 + 8
401 +2
2196 +8
14.4-—21.3
,
Stage lL
Stage 2
Filter
Total
5.30 + 0.76
1570410
262 + 2
1840 +10
3.78 41.67
42.024.7
6.47+0.29
562.345.6
<1
27.3 41.5
<5.0
30.3 + 4,5
82,5 + 0.4
12800 + 100
1750 + 10
14600 + 100
21.3~ 27.4
Stage 1
1.63 + 0.42 0.53 + 0.30
Filter
Total
45.0+20.9
228 +3
24.044.6
37 +6
3.8+42.1
1770 +12
Stage 1
Stage 2
Filter
Total
1.641.2
10.041.2
8.60+1.2
20 +2
<3
<1
2.1 21.0
4.1 + 3.0
Stage 1
Stage 2
Filter
Total
8,82 + 0.21
66.7+0.4
2.50 + 0.19
78.0205
0.16 + 0.11
2.38 + 0.25
0.13 + 0.06
2.7 + 0,3
374 + 2
536 +4
17.4 20.1
927 +4
15.2-—21.3
Stage 1
Stage 2
Filter
Total
18.520.5
406 +5
174 +2
599 +5
<0.4
13.1 + 3.2
4.41 + 0.77
17.5 + 3.3
732 +5
3850 + 21
2530 + 10
7110 + 24
21.3— 27.4
Stage Ll
Stage 2
Filter
Total
10.541.3
21.2 41.3
20.0 +1.7
51.7 + 2.5
<0.6
3.40 40.13
1.7 41.0
65.1 41.0
34.3 + 1,2
83.8 41.5
39,3 + 0.3
157 +2
27.4—29.6
Stage 1
Stage 2
Filter
Total
6.43 + 2.07
11.521.9
6.54 + 1.53
24.543.2
1.5 +1.1
<1
«<l
2.5 42.1
0.907 + 0.193
14.3 + 0.6
2.83 + 0.61
18.0 + 0.9
Mar, 16, 1962
Stage 2
27.4-— 29.8
181+ 3
12.8+4.1
<24
12.0 + 0.4
2610 + 15
4390 +19
6.05
34.3
27.2
67.6
+
+
+
+
0.43
1,1
1.8
2.2
Sept. 25, 1962
— 9,1-15.2
*Beta-counting interval for the Mar. 16, 1962, collection is Apr. ] to 18, 1962, and for
the Sept. 25, 1962, collection is Oct. 9 to 25, 1962.
The assigned errors represent one standard deviation, 1 a , in the ob-
served net counting rates as well as an estimate of the accuracy in
resolving beta-particle absorption or decay curves. Whenever observed
counting rates were close to detector background levels, gross counting
rates were increased by 2 a, and upper limits were calculated. The
low concentrations and small sample volumes prevented extensive
40Ba analyses and, in some fractions, **Mn determinations. It can be
noted from
the
data that
the general reliability of the values for
individual radionuclides increases in the order M0 Ba, Sr, “un, Mace,
and *Zr, which is approximately the order of increasing observed
activity.