Soil/Sediment Milk Ingestion

Equation 11 (non-radionuclides), equation 12 (radionuclides), and Table 8 present the exposure variables for the soil/sediment milk ingestion pathway. The milk ingestion pathway is conducted for the agricultural pathway only.

(11)

(12)

Table 8. Soil/Sediment Milk 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

Milk transfer coefficient = Fm

day/L

Chemical-specific

Fraction of year animal is on site = fp

unitless

(Site-specific)

Soil to plant uptake factor (dry) = BVdry

kg/kg

Chemical-specific

Mass loading factor = MLF

unitless

0.26

(Pinder and McLeod 1989)

Quantity of pasture ingested = Qp

kg/day

16.1

(IAEA 1994)

Quantity of soil ingested = Qs

kg/day

(Darwin 1990)

Fraction of animal feed from site = fs

unitless

(Site-specific)

Conversion factor = CF5

g/kg

1000

Diet fraction = FI

unitless

(Site-specific)

Ingestion Rate = IRm

L/d

0.509 (adult)

0.305 (child)

(EPA 1989b)

Exposure frequency = EF

d/year

350

(EPA 1989a)

Exposure duration = ED

years

24 (adult)

6 (child)

(EPA 1989a)

Body weight = BW

70 (adult)

15 (child)

(EPA 1991a)

Lifetime = LT

years

(EPA 1989a)

Averaging time = AT

yr H day/yr

70 H 365 (carcinogen)

ED H 365 (noncarcinogen)