vy
pai
A. C. Graves
-b-
June 28, 1951
Table III
sstimated total cose in roentgens from JANGLE shots.
(Miles)
5
10
4
920
Distance (Milvs)
20
35
50
100
100
9
1.3
0.
0.03
h.6
Leh
Oo
5.2
0.6
1
!
1200
240
20
3
|
15
160
63
15
* = Lose beyond 0 miles will increase with wind velocity for all
three cloud heights.
ee
Cloua Height .
ee
Wind velocity = 10 mph*, mean particle size = 75 microns (Trinity)
Table IV
Estimated total dose in roentgens for JANGLE,
Wind velocity = 10 Nph", mem particle size = 20 microns.
:
,t
|
!
|
Cloud Height
(Miles)
3
:
9
|
,
1
3
|
5
10
1h
18
istance (Miles)
20
35
50
100
160
62
15
5.2
0.6
60
18
18
7
0.9
2
8
10
7
1.7),
0.5
.
* — 4¢ 50 miles, level decreases for increasing wind velocities if
cloud height is 3 miles.
The estimated doses in Tables IIT and IV will bear further comment.
Sh
re
tet
”
.
Our interests from the safety viewpoint center on the region from
35 to 100 miles.
|
Tables TII shows a marked increase of dose with
cloud height and is apparently in contradiction with the s tatement
that the surface burst is the best.
It is felt, nevertheless, that
the deposition from a low cloud maywell be higher than indicated
because of the confinement of the cloud to the valleys, It is
mainly our uncertainties about the path of a low cloud, the extent
of neutron activation, and the true varticle size distribution which
leads to the conclusion that the surface shot is the best one to
start with,
i
i