ke
a
ta
ft
4
SG
Qj
on
iJ
~~
ead
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a
Tne wnole-body reteation of an element of activity taken up at time
r_
ip
wit re
(t - t)
.
:
:
.
23
r. S is the systemic whole-body retention for 39,
‘The activity taken up at dt
and remaining at t is
U (rt) t C(t - 1) dt.
dt
is