ae
a.
From these aseumrticus (f
Slows .
4%
Un CLASSIFIED
‘be dose pate on the ground is
fe
|
th at
g
ge
nie
Te KO
f
acpa
~
GR an
, ats
where K is tuse rate per unit «* av ae concentration, H is the height
of the top
of tre cloud, anc * ie *
+ + >e distance from the point at
which the dose -ate s estimp sec «2 eac’ of the landing points of central
particies,
There iarding points wil
level from whic’
of h.
The
*%e centrmi vart.:.*
amiiswe mints aise dene
also a functis:
% %,
iepend or the wind pattern below the
originated, so that r is a function
"
Changing ’1:
tre rate of fall, so that r is
at»
ff fal. to time of fall, one
obtains
mo
where (X,Y)
oe
are
r
yak ; co,
rectangucar
a "
os: ates of toe point where dcse rate
ar 1, ¥ are the wood. mpcnents i: the same co-ordinate
je estimated
system, aversavet it
tre se ,gre
tf
We may also xpress
,
twit;
po: rete
noting that w is the average speec regardless of direction.
°
not, in general. «1% components»
(u and ¥ are
“tis expression is correct if one
devescs oo the total horizontal
is satisfied tnat tre diffusio:
travelled by a cent al particie.
9°
distance
+e wishes to assure that the wartical
distance shotid be nc.uded, ¢c de mes mucr more complicated,
The simificars 7 Pand ma car:
_
ao
=
Bac
+
= (* '' sualizec,
If m- 2, then
uu
Fa,
sc that the latera.
dimersions
of any regmert of the cloud will increase
Uh co CASSIFIED