(9)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.
(9)
(10)
Table 7. Soil/Sediment Beef Ingestion Parameters
|
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) |