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FY2018 Results of the Radioactive Material Monitoring in the Water Environment

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FY2018 Results of the Radioactive Material Monitoring in the Water Environment FY2018 Results of the Radioactive Material Monitoring in the Water Environment March 2020 Ministry of the Environment Contents Outline .......................................................................................................................................................... 1 Part 1: National Radioactive Material Monitoring in the Water Environment throughout Japan (FY2018) . 6 1 Objective and Details ............................................................................................................................. 6 1.1 Objective .................................................................................................................................... 6 1.2 Details ........................................................................................................................................ 6 2 Survey Methods and Analysis Methods .............................................................................................. 19 2.1 Survey methods ....................................................................................................................... 19 2.2 Analysis methods ..................................................................................................................... 20 3 Results ................................................................................................................................................. 22 3.1 Detection of total β radioactivity and γ-ray emitting radionuclides .......................................... 22 (1) Public water areas .................................................................................................................. 22 1) Water ..................................................................................................................................... 22 2) Sediment ............................................................................................................................... 24 (2) Groundwater .......................................................................................................................... 26 3.2 Discussion regarding detected radionuclides .......................................................................... 28 (1) Detection of naturally occurring radionuclides ....................................................................... 28 1) Correlation between activity concentrations of K-40 in water samples and seawater ......... 28 2) K-40 in sediments ................................................................................................................. 30 3) Uranium and thorium series radionuclides in sediment samples ......................................... 31 (2) Detection of artificial radionuclides ........................................................................................ 34 1) Cs-134 and Cs-137 in water samples from public water areas ........................................... 34 2) Cs-134 and Cs-137 in sediment samples from public water areas ...................................... 35 3) Cs-134 and Cs-137 in groundwater ...................................................................................... 40 3.3 Survey results on seasonal variations ..................................................................................... 41 Part 2: Radioactive Material Monitoring in the Water Environment in and around Fukushima Prefecture (FY2018) ..................................................................................................................................................... 47 1 Objective and Details ........................................................................................................................... 47 1.1 Objective .................................................................................................................................. 47 1.2 Details ...................................................................................................................................... 47 2 Survey Methods and Analysis Methods .............................................................................................. 49 2.1 Survey methods ....................................................................................................................... 49 2.2 Analysis methods ..................................................................................................................... 49 3 Outlines of the Results ........................................................................................................................ 50 3.1 Detection of radioactive cesium ............................................................................................... 50 3.2 Detection of radionuclides other than radioactive cesium ....................................................... 53 4 Results ................................................................................................................................................. 54 4.1 Radioactive cesium .................................................................................................................. 54 i 4.1 -1 Water .................................................................................................................................... 54 (1) Public water areas .................................................................................................................. 54 1) Rivers .................................................................................................................................... 54 2) Lakes ..................................................................................................................................... 54 3) Coastal areas ........................................................................................................................ 54 (2) Groundwater .......................................................................................................................... 54 4.1-2 Sediment ............................................................................................................................... 58 (1) Detection status ..................................................................................................................... 58 1) Rivers .................................................................................................................................... 58 2) Lakes ..................................................................................................................................... 58 3) Coastal areas ........................................................................................................................ 58 (2) Changes in concentration levels ............................................................................................ 62 1) Rivers .................................................................................................................................... 62 2) Lakes ..................................................................................................................................... 63 3) Coastal areas ........................................................................................................................ 63 (3) Detection of radioactive materials in sediment by location .................................................... 64 1) Evaluation policy ................................................................................................................... 64 2) Concentration levels in sediment samples from rivers, lakes, and coastal areas and their changes by prefecture .......................................................................................................... 67 2)-1 Rivers ................................................................................................................................. 67 2)-2 Lakes ................................................................................................................................. 85 2)-3 Coastal areas ................................................................................................................... 101 2)-4 Conclusion ........................................................................................................................ 111 4.2 Results (Radionuclides other than radioactive cesium) ........................................................ 120 4.2-1 Radioactive strontium (Sr-90 and Sr-89) ............................................................................ 120 (1) Public water areas ................................................................................................................ 120 (2) Groundwater ........................................................................................................................ 123 4.2-2 Other γ-ray emitting radionuclides ...................................................................................... 124 Part 3: Other Radioactive Material Monitoring Conducted Nationwide (FY2018) ................................... 126 1 Outline of the Monitoring ................................................................................................................... 126 1.1 Covered monitoring ................................................................................................................ 126 1.2 Compilation methods ............................................................................................................. 126 2 Results ..............................................................................................................................................
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