(20)Equation 20 (non-radionuclides), equation 21 (radionuclides), and Table 14 present the exposure variables for the surface water/groundwater beef ingestion pathway. The beef ingestion pathway is conducted for the agricultural pathway only.
(20)
(21)
Table 14. Surface Water/ Groundwater Beef Ingestion Parameters
|
Parameter |
Units |
Agricultural |
|
Non-radionuclide chemical concentration in water = Cwn |
mg/L |
Chemical-specific |
|
Radionuclide chemical concentration in water = Cwr |
pCi/L |
Chemical-specific |
|
Quantity of water ingested (cattle) = Qw |
L/day |
50 (IAEA 1994) |
|
Beef transfer coefficient = Bf |
day/kg |
Chemical-specific |
|
Ingestion ratec = IR |
kg/day |
0.075 (EPA 1989b) |
|
Conversion factor = CF |
g/kg |
1000 |
|
Diet fraction = FI |
unitless |
1 |
|
Exposure frequency = EF |
day/yr |
350 (EPA 1989a) |
|
Exposure duration = ED |
years |
30 (EPA 1989a) |
|
Body weight = BW |
kg |
70 (EPA 1989a) |
|
Conversion Factor = CF2 |
days/yr |
365 |
|
Lifetime = LT |
years |
70 (EPA 1989a) |
|
Averaging time = AT |
years |
LT (carcinogen) ED (noncarcinogen) |