(Shot Humboldt), while the delivery crews, in the open, would receive 15 r of initial gamma
radiation at ranges of.
575 yards, respectively.
4. The observed variation ofgamma dose with azimuth for the surface burst is probably
caused by the contribution of dose from the transient cloud.
5. The residual-gamma fields produced by low air bursts detonated on wooden towers are
very small (less than 200 yards radius at H+15 minutes) for the 10 r/hr isodose line. This
TABLE 10
SHOT HUMBOLDT GAMMA DOSES AT PROJECT 4.2
STATION (TEST CONDITIONS)
Station
Slant Distance
Corrected Dose
yd
rc
Doses in the Open, East Line
25
50
26.4
50.7
19,000
5,500
100
100
2,800
200
200
500
450
450
41
600
700
600
700
4
7.5
800
800
4.1
300
300
160
Doses in Foxhcoles
53
10.5
10 N
1538
20 N
258
5.N
:
13.3
‘ 16.9
,
20.2
14,500
16,000
*
6,000
23.7
5,900
10.5
13,600
20S
16.9
20.1
3,900
25 N
23.7
1,500
10S
15 N
13.3
13,200
6,400
Doses in Vehicles
APC 66
30.5
Front
19,000
Middle
11,500
Middle
Rear
APC 70
9,800
16,000
30.5
Front
18,200
Middle
Rear
12,200
10 ,400
Middle
13,200
* Film badge defective.
‘ field is due to fission-product radiation, probably from contaminated tower materials.
6. The alpha-contamination levels from low air bursts at distances greater than 100 yards
are considered to be an insignificant hazard.
RECOMMENDATIONS
Further experimentation on fractional-kiloton devices is desirable because the small number
29