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Table 4

Generic radionuclide concentrations below which no radiological effects are expected on non-human biota at Canadian CANDU sites.

Nuclide Air concentration (Bq/m3) Soil concentration (Bq/kg dry weight soil) Fresh water concentration (Bq/L water) Marine water concentration (Bq/L water) Freshwater sediment concentration (Bq/kg dry weight sediment) Marine sediment concentration (Bq/kg dry weight sediment)
H-3 8.84E+04 * 1.26E+07 1.26E+08 1.26E+07 1.26E+08
C-14 1.52E+03 * 8.45E+03 8.45E+04 8.45E+04 8.45E+04
Co-60 2.71E+04 1.92E+03 2.98E+01 1.15E+06 1.79E+04
Sr-90 3.11E+05 6.49E+02 2.28E+03 8.43E+04 2.97E+05
Zr-95 4.34E+04 3.64E+03 2.98E+02 2.18E+07 1.79E+06
Nb-95 2.56E+05 1.07E+02 1.73E+03 1.71E+05 2.77E+06
I-131 5.40E+05 3.50E+02 3.20E+02 2.66E+04 3.20E+03
Cs-134 1.28E+05 3.84E+02 2.47E+03 1.04E+06 6.66E+06
Cs-137 5.33E+04 9.24E+01 2.53E+03 2.49E+05 6.83E+06

*: In most cases, the air concentrations of HTO and C-14 are available and can be used to ensure the protection of biota. In rare cases where soil concentrations are required, they can be calculated using the specific activity model.

: Unit is Bq/g dissolved inorganic carbon in water for C-14.

: Units are Bq/L of sediment water for HTO; and Bq/g total organic carbon in sediment for C-14.

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