Calculation of radionuclide ground deposition by means of measurements on sewage sludge |
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Authors: | Bengt Erlandsson Björn Bjurman Sören Mattsson |
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Affiliation: | 1. Department of Nuclear Physics, University of Lund, S?lvegatan 14, S-223 62, Lund, Sweden 2. Swedish Defence Research Establisment, S-102 54, Stockholm, Sweden 3. Department of Radiation Physics, University of Lund, Malm? General Hospital, S-214 01, Malm?, Sweden
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Abstract: | The concentrations of various radionuclides have been measured in the incoming water, the outgoing water and the sludge from the sewage treatment plant serving the town of Lund in southern Sweden. The mean residence time for the water in the plant is 1 to 2 days, whereas for the sludge it is 3 to 4 weeks. Variations in the residence time, which may influence the efficiency of the plant, are related to the season of the year and the load on the plant. Measurements show that for 7Be, 51Cr, 134Cs, and 137Cs between 37 and 56% of the incoming activity leaves the plant with the sludge. For 106Ru and 131I these figures lie between 6 and 14%. The deposition of 7Be has been measured at Lund and the relation between the deposition on the ground (Bq m?2) and the activity concentration in the sludge (Bq kg?1 dry weight) has been studied and found to by relatively constant at ?(0.8 ±0.2) kg m?2. In measurements on sewage sludge, the detection limit for deposition of 7Be on the ground is around 16 Bq m?2. |
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