Surface Water/Groundwater Beef Ingestion

Equation 20 (non-radionuclides), equation 21 (radionuclides), and Table 14 present the exposure variables for the surface water/groundwater beef ingestion pathway. The beef ingestion pathway is conducted for the agricultural pathway only.

 

image\v4ht0218.gif  (20)

 

 

image\v4ht0219.gif  (21)

 

Table 14. Surface Water/ Groundwater Beef 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 (cattle) = Qw

 

L/day

 

50

(IAEA 1994)

 

Beef transfer coefficient = Bf

 

day/kg

 

Chemical-specific

 

Ingestion ratec = IR

 

kg/day

 

0.075

(EPA 1989b)

 

Conversion factor = CF

 

g/kg

 

1000

 

Diet fraction = FI

 

unitless

 

1

 

Exposure frequency = EF

 

day/yr

 

350

(EPA 1989a)

 

Exposure duration = ED

 

years

 

30

(EPA 1989a)

 

Body weight = BW

 

kg

 

70

(EPA 1989a)

 

Conversion Factor = CF2

 

days/yr

 

365

 

Lifetime = LT

 

years

 

70

(EPA 1989a)

 

Averaging time = AT

 

years

 

LT (carcinogen)

ED (noncarcinogen)