TABLE 7

EFFLUENTS FROM URANIUM MINING AND MILLING



Basis: 1 metric ton of uranium ore yields 2 kg yellow cake

Activity: 20 MBq for each member of 238 U decay chain, or total of approximately 300 MBq

Radium in mill liquid effluents: 10-20 Bq/L (prior to treatment)

Treated effluent prior to discharge: 0.3-3.0 Bq/L

Nuclides in liquid effluents prior to any neutralization of acid solutions and precipitation of thorium salts:

223 Ra, 226 Ra, 227 Th, 230 Th, 232 Th, 222 Rn, 227 Ac, 210 Pb, 210 Po

Waste generation (1955-1985): 1.2 10 8 m 3 waste rock and tailings (Elliot Lake region)

Represents an activity of 2000 terabecquerels (TBq) of 226 Ra (MCi) in 100 megatons (metric) of waste rock, at a concentration of some 18.5 Bq/g. Radon is estimated to emanate from these piles at a rate of 22 Bqm -2 s -1 .


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