Ld phi
—o
T
oO
T
733
1
°
TOT Ett
T
1
10°
tt teiiel
ry
c= 0.70 * 105(1,04 —@-0.11r}
a
l
1
0
1
2
L
3
4
* RAINFALL, IN.
i
5
!
6
Fig. 6—Ratio of deposition, D, and airy concentration, C4, of gross beta
vadioactivity us. rainfall for monthly samples at Chilton and Milford
Haven, England, from August 1962 to April 1963.
_
F
=
-0.1r)
ey.
.
2 = 20
- * 105(105-e
Ca
o
2|
Stine
De= 2.0 10°(10
e031)
2
“A
°
Yj
4
a
10? Ee
a
-
104
0
1
2
3
4
5
b
RAINFALL, IN.
Fig. 7—Ratio of deposition, D, and air concentration, C4, of gross beta
radioactivity vs. rainfall for average monthly collections from January
1959 through September 1959 at Kjeller, Norway. ©, dry plus wet deposition; 4, wet deposition.
the collector. Separate measurements of dry and wet fallout were made
during this period. The best fit to the points representing total deposition was made with a value for a of 1.05. If a is set equal to 1.0, the
contribution of dry fallout, in effect, is eliminated. Figure 7 also shows
a fairly good fit of the wet-deposition data to the curve with a equal to
1.0.
Limitations
Two parameters in the model stayed fairly constant over the time
periods and at the locations covered in this paper. All the data could be
fitted with the model having a value for b of 0.11. The dry-fallout factor, a, varied only from 1.04 to 1.065. On the other hand, the parameter