2.21 BOATING EXTERNAL RADIATION
Recreational boating on water contaminated with radioactive
pollutants may result in external exposure to the occupants of the boat.
This exposure is estimated using the same model as for swimming in contaminated
water except that the boat occupants are assumed to receive a fraction
of the dose compared to the swimmer who is completely immersed in water.
- Transport Medium:
- water concentration at the surface water body location for aquatic recreational activities, Cswi, pCi/L, expressed as a 70-year average value
- Special Process:
- loss of pollutants during transport in the surface water body by volatilization dose rate exposure reduction due to being in a boat relative to immersion while swimming
- Exposure Factors:
- frequency of boating exposure and exposure duration.
The total lifetime dose from external exposures to
radionuclides while boating is evaluated as follows:
(106)
where
Dbei = total lifetime dose for radionuclide pollutant i from boating in contaminated surface water (rem)
Cswi = concentration of pollutant i in surface water at the boating location (pCi/L)
DEwi = dose conversion factor for immersion in contaminated water for radionuclide i (rem/h per pCi/L)
SB = shielding factor for boating exposures (dimensionless)
Fbe = fraction of days per year that boating occurs (dimensionless)
FEbt = average frequency of boating events (events/d)
TEb = duration of an average boating event (hours/event)
EDbe = exposure duration for the boating pathway (yr).