June BB, 1951
4A. G, Graves
Table IV indicates the effect of particle size.
generally raised
The levels are
at the distances of interest -- 20 microns is about
the worst sige -- but it is apparent that the predictions ars Duginning to favor the higner cloud height. If the mean particle
size is 12.5 microns, all levels fall and the dose from the 1/2-mile
cloud height, though down to 3r, is a factor 10 greater than the
dose from the lemile cloud. In the case of 12.5particles, the
doses are considerably greater for all cloud heights if the wind
velocity is reduced from 10 to 5 mph.
GAELEN L. FELT
J-Division Office
GLFslh
Distribution:
Cpy 13 thru SB - Folt