Wadle the sector is very larce in the Pacific it is not true that the
falleout 4a uniformly distributed within it, end it therefore becomes
necessary to look closely at the angular distribution of fall-cut as well
as-the-radial, It is this new factor in the enalyeis which makes the
C.STLE-system differ fundamentally from the Nevada system, It dses not
necessarily follow that the Nevada systam should not also havo thts feature
since there are evident failings there which may serhaps be removed in
this ways
Dose
“
The first step in the new system of analysis was to calculate the
relative dose at various points about the origin for a given wind stracture.
The mecharmies of preparing the isodose plots will be decribed in the followis
sections.
the method.
Here we shall discuse the aseumptions and general principles of
The assumptions used in the caleulations aro listod below:
(1) The activity is uniforaly distributed in height. ‘This
assumption is obviously a poor one and was subsequently altered to eaxhasizce
the aiddle region of the cloud and to depress the stem and the top. In the
firet plot this acdifieation was aprlied at the plotting stace rather than
at the calculaticnal stage.
very amall particles is
is
_
(3) Tie amountof activity deposited by an active particle is
onal, ta: {ts area. One say fairly argue that in some cases the
astivity should be proportional to the particle wilums. The choice of
is based on. the idea of vlating on molton salids end on the
ares
idee of seavenging by water dropicts.
, {b).
decays. a& Q°**“,
The total activity is rroportional to the total yield and