776
MARTIN
To illustrate the potential value of the model formulated above, we
have adopted the parameter values listed in Table 5. Most of these
values are based on experimental data reported in the literature, but,
when two or more estimates of a given parameter value were found, we
usually selected the one resulting in higher concentrations in milk or
Table 5— PARAMETER VALUES USED WITH EQS. 8 TO 10 TO
CALCULATE HYPOTHETICAL CONCENTRATIONS OF *Sr
AND 3!1ON PASTURE PLANTS, IN COWMILK, AND IN HUMAN TISSUES FOLLOWING A SINGLE FALLOUT EVENT*
4
Parameter?
®Sr
131y
References
Arbitrary values
33
Po
Km
100 pe/g
1.4 g/ml/day
400 pe/g
4 g/ml/day
K,, (adult)
K,, (infant)
1/7 ml/day/g
10/7 ml/day/g
50 ml/day/g
500 ml/day/g
1.43 x 1074
18.0 days
1.17 x 107%
5.5 days
fn
fy
Ky+t
Tp
Tn
Ty
0.02
0.21
2.5 days
00.4 days
-.06
34, 35
20
20
0.30
20
20
13, 16
2.0 days
34
7.9 days
20
*Results are shown in Figs. 7 and 8.
+Parameters are defined in the text,
tUsed with Eq. 11 to calculate tissue doses.
human tissues. The results of calculations based on Eqs. 8 to 10 and
the parameter values listed in Table 5 are shown in Figs. 7 and 8. Ob-
viously, for different values of P), the corresponding values of M, and
H, would be proportionally larger or smaller than shown in Figs. 7 and
8. Using the same effective half-lives but different estimates of K,,,
fin, Ky, or f, would also result in proportionally higher or lower esti-
mates of M, and H,.
The total dose, D,, delivered by N; to the human tissue or organ of
reference is given, fort =0 tot = ™, by
1-e7
1 eT
D, t= = Py P)KmfmmKufr
K; Ap(Am — Ap)(An
Krink
— Ap) + Am(Ap — Am)(An — Am)
+
1—
~Apt
c
ALAG— AWA
— Ax)
(11)
where D; = total dose (rem) delivered by Ni, from t = 0 tot > 0, to the
human organ or tissue of reference
ty
nou
=
[(3.20 x 10° dis/pc/day) (E)/ (6.24 x 10’ Mev/100 ergs/g) ]
effective absorbed energy (Mev) per disintegration of N;
[Mev absorbed/disintegrations of N; x relative biological
effectiveness (RBE)|