Equation 9 (non-radionuclides), equation 10 (radionuclides), and Table 7 present the exposure variables for the soil/sediment beef ingestion pathway. The beef ingestion pathway is conducted for the agricultural scenario only.
Parameter
Units
Agricultural
|
Non-radionuclide chemical concentration in soil = Csn
mg/kg
Chemical-specific
Radionuclide chemical concentration in soil = Csr
pCi/g
Chemical-specific
Beef transfer coefficient = Ff
day/kg
Chemical-specific
Fraction of year animal is on site = fp
unitless
1
(Site-specific)
Soil to plant uptake factor (dry) = BVdry
kg/kg
Chemical-specific
Mass loading factor = MLF
unitless
0.26
(Pinder and McLeod 1989)
Quantity of pasture ingested = Qp
kg/day
7.2
(IAEA 1994)
Quantity of soil ingested = Qs
kg/day
1
(Darwin 1990)
Fraction of animal feed from site = fs
unitless
1
(Site-specific)
Beef ingestion ratec = IRf
kg/day
0.075
(EPA 1989b)
Conversion factor = CF5
g/kg
1000
Diet fraction = FI
unitless
1
(Site-specific)
Exposure frequency = EF
day/yr
350
(EPA 1989a)
Exposure duration = ED
years
30
(EPA 1989a
Conversion Factor = CF2
days/yr
365
Body weight = BW
kg
70
(EPA 1989a)
Lifetime = LT
years
70
(EPA 1989a)
Averaging time = AT
years
LT (carcinogen)
ED (noncarcinogen)
(9)
(10)