TABLE C.2
ALTITUDE ABSORPTION MEASUREMENTS OVER LAND,
FRESH FISSION PRODUCTS
All measurements made with Top Hat detector TH~10-A.
Absorption of Radiation
Altitude
i
oF
ft
mr/hr
3
50
10
6.3
100
4.8
150
200
4.3
3.3
pet
mr/hr
708
49
pet
3
mr/br
pet
100
_—
100
—_
250
_
100
_
34
_
_
_
—_
30
23
_
_
_—
_
_
—_—
—_
—_
—_
_
_
250
2.75
19
_
300
2.35
17
31.7
350
1.85
13
_
400
1.7
12
_
450
1.52
11
_
500
1.7
12
21
550
1.3
9.2
_
_
_
600
700
1.0
_
6.2
_
_
13
_
5.2
_
4.8
_
4.8
800
900
0.76
—_
5.7
_
_
6.9
_
2.8
_
2.7
_
2.7
12.7
—_
15.9
16
_
_
_
_
—_—
_
_
8.4
8.6
8.6
* Operation Teapot, 1955, NTS, Shot Turk.
t Operation Plumbbob, 1957, NTS.
t Operation Plumbbob, 1957, NTS.
§ 10 mr/hr, based on single surface reading at 3 feet.
TABLE C.3
ALTITUDE ABSORPTION MEASUREMENTS
OVER WATER, FRESH FISSION PRODUCTS
Absorption of Radiation
7
a
Altitude
ft
mr/br
pet
50
83
83
mr/hr
_
pet
—
100
72
72
—
—
200
300
60
40
60
40
17
—
62
—
400
35
35
15
32
600
20
20
10
18
800
1,000
10
5
10
5
6.1
—~
10
—
* Operation Wigwam, 1955, scintameter TH-3, helicopter.
ft Operation Wigwam, 1955, Top Hat detector TH-10-A,
AD-S5N aircraft.
67