(7)Equation 7 (non-radionuclides), equation 8 (radionuclides), and Table 6 present the exposure variables for the soil/sediment produce ingestion pathway. The produce ingestion pathway is conducted for the agricultural scenario only.
(7)
(8)
Table 6. Soil/Sediment Produce 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 |
|
Soil to plant uptake factor (wet) = BVwet |
kg/kg |
Chemical-specific |
|
Mass loading factor = MLF |
unitless |
0.26 (Pinder and McLeod 1989) |
|
Conversion factor = CF5 |
g/kg |
1000 |
|
Diet fraction = FIv |
unitless |
0.4 (EPA 1989b) |
|
Ingestion rate = IRv |
kg/d |
0.2 (EPA 1989b) |
|
Exposure frequency = EF |
d/year |
350 (EPA 1989a) |
|
Exposure duration = ED |
years |
30 (EPA 1989a) |
|
Conversion Factor = CF2 |
days/yr |
365 |
|
Body weight (adult) = BW |
kg |
70 (EPA 1989a) |
|
Lifetime = LT |
years |
70 (EPA 1989a) |
|
Averaging time = AT |
years |
LT (carcinogen) ED (noncarcinogen) |