aay
ies
busOs
(continued)
assumption is made that all cf the strontium 90 which falls on
the ground is available.
One knows that soils have rather
pronounced exchange characteristics..j.can one gues#e..so that
I would take it that this is a rather pessimistic assumption,
and I was curious as to how pessimiatic it is.
Have axperiments
been done in putting strontium 90 inte ordinary soil and then
finding out what is avatlabie?
. LYBSYs
LARSEN s
Thatta whet you're doing, im't it, Dr. Larsen?
Yes. We have bean looking at various shots, and the one piece
of data that is most complete inén the underground, which, es
nest of you probably imow, is about a 1.2 KT.
What we did there
wan to tale soil flats from California soil representing § inches
in depth, and abeut i #q. feet each box was in this dimension,
and we distributed this over the territory of predicted fallout.
We came back with helf of what we hod distributed as contaminated,
which we could measure by survey meters,
I'11 take one, which
represents one of the naxinua activities to illustrate what we
found. Wa had 196 sicrecuries total surface activity on 12/17/51,
and we have gram 5 orope of radishes consecutively on that and
ah
the observed values, for example, On January 15, 1952, was 16.9
disintegrations per second per gran of plant dry material.
The
last crop came off in 9/19/52, of radishes, and this read 1.12.
Row the controls that we had growing on the same soil, but
without any centamination, reed, in this crop 1/15/52 series,
it was 1.69 d/a/gram and over here 9/15/59 we sere getting about
Ze
ep
WOE ARCHIVES