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)