5.25 Soil External

5.25 SOIL EXTERNAL

    External exposure to contaminated soil is considered for the atmospheric transport pathway and the measured soil pathway. Default parameter values for these exposure pathways are given in Table 5.24.

5.26 AIR EXTERNAL
    Exposure to air contaminated with radioactive material may result in external exposure while an individual is near the plume. This exposure pathway requires definition of the daily exposure time, as given in Table 5.25.

    The default value for the air external exposure time is set to 24 hours representing continuous exposure.

TABLE 5.23 Shoreline External Exposure Parameter Default Values

			Default Value
Parameter	Definition	Units	Individual	Population
F_he	time fraction	--	1.0	1.0
TE_l	shoreline event time	h/event	0.5	0.5
FE_sl	shoreline frequency	event/d	0.066	0.066
SW	shore width factor	--	0.5	0.5

TABLE 5.24 Soil External Exposure Parameter Default Values

Parameter	Definition	Units	Default Value
			Individual	Population

Atmospheric and measured soil routes:

F_de	time fraction	--	1.0	1.0
U_de	soil exposure time	h/d	0.24	24

Atmospheric deposition route:

t_ms	soil layer thickness	m	0.04	0.04
r_ms	soil density	g/cm³	1.5	1.5