Table 9.
Task Group Lung Medel Parameter Values
70% OF TOTAL DEPOSITED
V
FRACTION OF INHALED PARTICLES DEPOSITED
IN THE RESPIRATORY SYSTEM VERSUS PARTICLE DIAMFTFER
99, 7%
Particle Size
AMAD
Micrometers
Fraction of Inhaled Quantity Retained
Nasopharyngeal
Tracheobronchial | Pulmonary
Region, Dy
Region, D,
Region, D
:05
wl
13
5
-O
10
-0
0.001
0.008
0.063
0.13
0.29
0.50
0.77
0.08
0,08
0.08
0.08
0.08
0.08
0.08
.59
250
36
31
.23
-17
-ll
¥
STOMACH
(LE HOUR TRANSIT)
100%
NA SOPHARYNX0.3%
TRACHEOBRONCHIAL (8 MINUTES)
BLOOD
(8 HOURS) [4
30% OF TOTAL DEPOSITED:
PULMONARY
LUNG
¥
SMALL INTESTINE
{4 HOURS TRANSIT)
(b)
SKELETON
29%
KIDNEYS
¢¥—
100%
k
a
b
0.01
0.01
0.50
0.50
0.01
0.40
0.10
0.90
0.01
0.46
c
d
0.01
0. 20
0.95
0.05
0.01
0.20
0.50
0.50
0.01
0.20
059
Translocation Class
W
b
b
T,.
fy
Ty
e
f
g
h
0.50
nea.
N.a.
0.50
0.80
n.a.
nN.a.
0.20
50
1
50
50
0.45
0.40
0.40
0.05
500
1
500
500
ec0e
oS
D
b
Tt,
i
0.50
1,00
50
1.00
1000
,@
Compartment
%
SS STS SS
f
90
f
UPPER LARGE
INTESTINE
{13 HOURS TRANSIT)
100%
URINE
¥.
LOWER LARGE
INTESTINE
(24 HOURS TRANSIT)
LIVER
2%
2%
1%|
*{NITIAL ALVEOLAR DEPOSITION
(a) Estimated From data of Task Group on Lung Dynamics (Morrow 1966).
(b) As amended by ICRP Publication 19
(1972)
D.W.Y. = Days, Weeks, Years
lec. = Clearance pathway (See Figure 4)
BLOCK DIAGRAM OF THE SHORT-TERM FORM OF THE SDB MODEL
Biological half-time (days) for pathway k
= Fractton cleared by pathway k
668
669