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