fon is the fraction of the radionuclide entering B which is
Vv"
transferred to organ n
n = bone, Liver, kidney, etc.
05
T, is the half-life of the radionuclide (day),
Ty is the biological half-life of radioactive dust deposited in
subcompartment k of the respiratory tract (day)
FA
Ty 4s the biological half life of the radionculide deposited in
NP
_
1n(2)/T = h (day 1 }
a
NPp
faD5
organ n (day),
In(2)/T,
t
(b)
1h039]
j
NASOPHARYNGEAL REGION
b
-1
A, (day )
in(2)/T| = xP (day)
u
v8]
BLOOD
1B
c
DgQy
(ch
0,
5.1216 x 10> E,/M, {1s the dose conversion factor
T
!
FgDgQ] pero eee
1
:
l
G.E.
TRACT
:
TRACHEOBRONCHIAL | REGION
(rem/pCi-day) for region or organ n.
E_
(d)
18
fh
(q)
is the energy deposited by radionuclide in region or organ
n (MeV/dis).
Same as LEF(RBE)n in Table 5 of Refs.[4,5].
(eb
M, is the mass of region or organ n (g}
Myp = 1.35 g, Mpg = 4008, Mp = 500g [6,7],
For other organs
4
see Refs, [3,4,5].
We [Wo
\
Pe
I
4
Ph
T
Pt
T
Py
te05Q] ! HOsQ, 1 Ds. 1 NqD5ey
|
th}
t
L.
ui une
LYMPH!
1
j
PULMONARY REGION
i
I
t
toSO eee ee J
FIGURE1.
Schematic Diagram of the Task Group Lung Model (8)
692
693