It.
In the case of cesium and zinc:
z
t
s(t) = a (1 -e?") + Sy eat
x is the daily accretion in uc/day, and 8, is the body burden in uc at t = o.
98
-ias +x = -a -'s oO e78t 4 z (1 - ont] +X
dt
= -E(t) +x
kP(t) = E(t) =a
=
-at
[se at ‘+a
(l-e’)
M= lin s(t) = x
t— 00
Zinc
a
65
a= 6.3.x 1075 days-? (t1/2 = 110 days)
k = 10
sy = 0.03 uc
- Cesi ume37
a= 4.6 x 1073 days"! (t1/2 = 150 days)
Ss
°
k = 1#
= 0
#The urinary/fecal ratio of radiocesium for human subjects is about 5/1, so that
estimates of body burden are too low by about 20 percent.
A-3
v