165
a
Certainly a more exhaustive study
of this is indicated for turf, clay and what
have you.
One of the things which will detere
mine the degree of heavy fallout after the
attenuation mechanisms have been made operative
ig the spectral composition of the fallout, the
spectral composition of the radiation from the
fallout,
Information along these linea in
reference to this problem is essentially none
existent, though of course there hns been a
tremendous amount of theoretical work done on
degradation pamna rays.
The washdown gituetion seems to be
pretty well in hand with the work that NRDL
has already performed and is continuing.
And lastly, what is a reslistio
value of permissible exposure in the event of
a major nuclear catastrophe?
,
This of course, will determine many
things, will have many vital effects on the
kind of counter measures, the kind of shield~
ing and the economics of protection egainst
this, twenty-five, up to fifty or something of