KREY: I would like to ask Mr. Crocker for a discussion of the situation for the Sedan shot. I recall that he indicated that ®*Mo did not
appear to fractionate. Some of our data from that shot indicated that it
did fractionate. The situation may well depend upon the distance from
ground zero. I would like to hear if he has any comments onit.
CROCKER: I must not have made myself clear. Molybdenum-99
did not fractionate in our Sedan samples. It did show somefractiona-
tion in some air-burst correlations that Dr. Freiling has made.
KREY: I believe
Sampling.
Did
you
you performed
find
some
upwind and crosswind
any variation of the fission products with
respect to *8Mo in the samples?
CROCKER: There was very little difference. I am speaking mainly
of Small Boy which is the shot from which I had the most data and am
in the best position to judge. There was very little upwind, downwind,
or crosswind fractionation of gross samples in the field. A very few
of the peripheral stations, those which collected very little activity
near the edges of the deposition pattern, showed a slight indication
that the fission products were a little more depleted in Zr ora little
more enriched in 88Sr but the effect was not very noticeable.
FREILING: I think you had something you wished to bring up about
the ratio of dose rate to the number of fissions.
CROCKER: I don’t believe Dr. Carl Miller is here. [He was unable
to remain for the discussion.] I wanted to ask him about his calculation
of roentgens per hour per kiloton per square mile. If anyone else has
made such a calculation from field data,
answers he obtained.
245
I would like to know the