Table 19, Parameters used in analysis of uncertainty and variability in estimated dose and cancer risk to hypothetical Rongelap
residents.
ty
Parametersé
Symbol
Variate
typeb
Value or
distribution model¢
Unit
Unit-conversion factor
c
Cc
2.431 x 10-4
Radiological decayrate of 137Cs
A
Cc
0.0230
Faction input to slow compartment
F
UV
U(2F -1, 1)
unitless
Variability expectation of F
F
U
U(0.855, 0.945)
unitless
Biological half-life of slow compartment
H
Vv
LN(in(F)-(s2,,H) / 2), sun(t)|
y
Population-average value of H
H
Cc
110/365
y
Uncertainty associated with H
B
U
U(0.9, 1.107)
unitless
SD of Ln(H)-variability
SLn(H)
Cc
0.275
unitless
Population-average value of R
R
U
N((R).(R)gr)
Bq/kg-y
Expected value of R
(R)
Cc
0.447x 365
Bq/kg-y
Annualdietary intake of 137Cs
R
UV
LN(in(R) - (st,(R) / 2), sun(R)]
Bq/kg-y
CV of (R) variability
8R
V
0.9821
unitless
SD of Ln(R) variability
SLn(R)
Cc
0.8217
unitless
CV in R due to dietary sampling uncertainty
YR
C
0.034
unitless
Uncertainty (model bias) associated with R
B
U
LN(-1.463, 0.8639)
unitless
U
LN(-7.970, 0.5409)
cSv-l
Uncertainty risk per unit dose
cSv kg Bqu! y-1
:
y"
a
SD standard deviation, CV = SD/mean
¢
U (ab) = uniformly distributed between a and b, LN (a,b) = lognormally distributed with geometric mean e* and geometric SD e%,
C = constant, U = uncertainty, V = interindividually variable (i.e., heterogeneous), UV = both uncertain and heterogeneous.