lial |
. 1,05 x lo-?
D
sr90 - “As.
80
Where
D
i=l
e
(+ 6.8 x 107)(ts = tni)
n
=
»
1
=
"
sr9
Ini
lL, —
NL
e = A (tg - ty)
(t, - tay )t-4
me/mi* of sr90
3.5 x 107° for I ni
5000 (Tropospheric)
4.7 x 1074 for Int
5000 (Stratospheric)
-6
pose = Ay ROIS
iel
¥
:
a Gg
-X(t, ” tni)
Dose = Infinity y dose in millirads
Defects of System
There are a number of defects in the overall gummed film system and
in fact, it only deserves the effort expended because there were no other
types of sampling available for the time and locations at which most of these
measurements were made,
These defects will be discussed individually even
though it is not possible to give good numerical estimates of the errors
involved,
The measurement is a total beta count only and is subject to the
errors of self-absorption and the change in average energy of
mixed fission products with time. The self-absorption is
partially corrected for by using basic standards with the same
weight of material as found in the average fallout sample. No
correction is made for such heavy or light samples as may appear
The average energy of the mixed fission prod-
» ur g
from time to time.
ucts has been calculated in this Laboratory based on the assumptions that the average energy is one-third the maximum
energy of the beta particle and that the percentage of ere}
isotepe in fallout samples follows the Hunter and Ballou 6
calculations,
The average energies calculated on this basis are:
“ay
1.