Numbers following E are exponents of 10.
Particles assumed insoluble for lung and GI tract, soluble for other organs.
(d)
{e)
(c)
ICRP is International Commission on Radiological Protection, Report of Committee IT (1959); Task Group is
and Bair
Task Group on Lung Dynamics (Morrow, 1966) as modified in ICRP-19 (1972); SDB is Stuart, Dionne,
(1968, 1971); Modified is our modifications to the SDB model (Bloom and Martin, 1974).
URT is upper respiratory tract which includes the nasopharyngeal and tracheobronchial regions.
Particle size assumed to be 0.5 um activity mean aerodynamic diameter.
(a)
(b)
2.84E+1
3. 36E+2
1,03E+2
6.42E+2
4. 30E+4
2.28E+5
1.34E+3
Inhalation
Modified
2,67E-2
3. 50E+1
8.73E+1
3.36E+2
1.03E+2
6.42E+2
4. 30E+4
2.28E+5
1.13E+3
2.67E+2
1,.97E-2
Inhalation
SDB
1.61E+2
7.59E+2
1. 54E+2
2.59E+4
Inhalation
Task Group
3,04E-2
1. 79E+2
4. 16E-2
Inhalation ©
ICRP IL
7,27E-1
7.48E-1
4.00E-3
6. 66E-2
7. 29E+2
5.O3E+2
2.55E-2
2.99E-1
6.61E+3
8.96E-2
0.00
G.00
6.66E-2
Ingestion
Ingestion
SDB
3.82E-1
675
Modified
0.00
6. 82E+2
8.96E-2
5.62E-1
0.00
5.62E-1
1.93E-2
2.02E-2
2.99E-1
8.18E-2
2,63E-1
9 .04E+2
1.93E-2
7.94E-1
4,05E-1
8.18E-2
1L.O7E-1
0.00
0.00
2. 50E-2
Ingestion
Task Group
0.00
Rem
0.00
50-Year Cumulative Dose to Organs
6.66E-2
Inhalation
Modified
8.30E-8
8. 30E-8
0,00
Inhalation
SDB
Ingestion
5.10E-2
1.14E-2
6.39E-4
9. 38E-3
9.38E+3
7 .A5E-2
7.45E-2
4.64E-3
1. 31£-15
0.00
7,26E-17
Inhalation ©?
Inhalation
ICRP IL
Task Group
6.37E-11
6.37E-11
0,00
Ingestion
Ingestion
SDB
Modified
0.00
0.00
0.00
Ingestion
ICRP il
1.19E-1
1.14E-2
6. 39E=-4
2.Q5E-1
4.98E-2
1.95E-2
1.68E-1
3.37E-3
8.30E-4
2.70E-5
4 11E-5
9.10E-6
9.10E-6
4.91E-7
9. 54E-8
2.90E-7
0.00
0.00
0.00
0.00
1.47E-B8
1. LIE-16
1, 89E-12
1. 70E-5
2.06E-5
0.00
0.00
| 1. 74E+5
1. 74E-5
2.49E-2
1.22E~2
2.27E+2
2.27E-2
4.91E-7
2.47E-5
2.47E-5
2.01E-5
4.03E+7
4.03E-7
2,95E-6 59)
5. 67E-6
9.53E-6
| Body
| Total
Kidney
Liver
Bone
Lymph Nodes
Thoracic
Ingestion
674
Mode ‘>?
Path
organ burdens and radiation
The preceding models were comp ared by computing
The units were
doses resulting from unit inta kes by ing estion or inhalation.
and the caleueither 1 wCi as a single intak e or 1 uCi/day continuous intake
ting organ burdens and doses after
lations were carried to 50 years. The resul
50 years are given in Tables 10 and 11.
ICRP II
MODEL COMPARISONS
Task Group
(0.003 x 0.70).
50-Year Organ Burdens, uwCi
ercent of the material initially
Like the SDB model, we assumed that 30 p
Since the short-term form of
in URT is rapidly transferred to DL.
terial in URT to GIT in a short
the SDB model transfers 99.7 percent of the ma
URT
to GIT is 69.79 percent
time (8 minutes), the effective transfer from
is 0.21 percent
(0.997 x 0.70). The corresponding transfer from URT to blood
dep osited
Lung
ALNM.
Most of
Parameters for the above eq uations can be obtained from Figure 7.
Our modithese values are identical to the SDB model (Stuart et al., 1971).
e to chronic inhalation
fications are designed to make the model more applicabl
utonium from blood to DL, and from
and to include ingestion, transfer of pl
The value for the transfer from GIT to blood is
blood to the Lymph nodes.
s are based
identical to the ICRP II value. The val ues for the other parameter
(1972) for the translocation of a soluble
on data reported by Ballou et al
Stuart et al. (1971) recomform of plutonium (plutonium cit rate) in dogs.
lungs to
mended a variable half-time for p art of the transfer rate from the
ear half-time for the entire lung
blood but 1t was felt that a constant, 3-y
It was also much easier to
was an adequate representation of thet rv dog data.
use the constant half-cime for the mat hematical d escription of chronic inhalation.
|
Task
r,A,y,f,D,An, and H, are as defined previously in the ICRP II,
The subscript URDL refers to trans~
Group, and SDB models.
is from
fer fr om URT to DL, BDL is from blood to DL, DLTL
DL to TLNM, BTL is from blood to TLNM, DLTR is from DL to
TLNR, DLAL is from DL to ALNM, and BAL is from blood to
Tract
where
Ee
(80)
urr’©?
(ay + Ang) Yop
Comparison of Calculations for 1 uCi Single Intake Using Various Models
dypg/dt = faoats
79)
10.
foanép ~ (a * AB) ¥pone
Table
AYpone! at