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.

 

image\v4ht0220.gif  (22)

 

image\v4ht0221.gif  (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)