Surface Water/Groundwater Milk Ingestion
Equation 22 (non-radionuclides), equation 23 (radionuclides), and Table 15 present the exposure variables for the surface water/groundwater milk ingestion pathway. The milk ingestion pathway is conducted for the agricultural pathway only.
(22)
(23)
Table 15. Surface Water/Groundwater Milk 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 (dairy) = Qw
L/day
75
(IAEA 1994)
Milk transfer coefficient = Bm
day/L
Chemical-specific
Ingestion Rate = IRm
L/d
0.305 (adult) (EPA 1989b)
0.509 (child) (Pao et al. 1982)
Exposure frequency = EF
d/year
350
(EPA 1989a)
Exposure duration = ED
years
24 (adult)
6 (child)
(EPA 1989a)
Body weight = BW
kg
70 (adult)
15 (child)
(EPA 1991a)
Conversion Factor = CF2
days/yr
365
Lifetime = LT
years
70
(EPA 1989a)
Averaging time = AT
years
LT (carcinogen)
ED (noncarcinogen)