BRAVO test.
These data,
together with appropriate conversion factors and living
pattern models, provided an estimate of external dose equivalent.
METHODS
Exponentially declining activity concentrations have been observed in surface soll for 13706, 129, and 905, from 1954 to the present on Rongelap
and Utirik Atolls.
Declining activity concentrations have also been observed
in vegetation at a rate greater than that predicted by radioactive decay.
Thus exponential decline in dietary activity was assumed and the following
general equations were derived.
pe =
1 =(\ 4K
@ OPK,
Rix;
(5;
a2
— us/fy
7K.
-()\+Kp)e
é tg Mini
[e AMEE
-Kg
1
1 K
~(\+K 3 )t
- eNAMAATT)
’
(1)
or
£o
yt
g-q? ii Xie
XP? =
f
1
X_
1
i K.-K
iE
(2.
(e
et
OAK.iv
)
(@TOAMKEIE © QrOAPK YE
e
J,
2
(2)
and
|Kivke (O*Ki) (K
EtA)EI(KE; +X+) (y 4p) oe
eAK
K.
k.-K,
p=- ¢.1 ,pe yg. ii K-ei
X:
+a 2; Tr?1 (ine
where
-(,+Ks )t
reds
G3)