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FY2017 Results of the Radioactive Material Monitoring in the Water Environment

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FY2017 Results of the Radioactive Material Monitoring in the Water Environment FY2017 Results of the Radioactive Material Monitoring in the Water Environment March 2019 Ministry of the Environment Contents Outline .......................................................................................................................................................... 5 1) Radioactive cesium ................................................................................................................... 6 (2) Radionuclides other than radioactive cesium .......................................................................... 6 Part 1: National Radioactive Material Monitoring Water Environments throughout Japan (FY2017) ....... 10 1 Objective and Details ........................................................................................................................... 10 1.1 Objective .................................................................................................................................. 10 1.2 Details ...................................................................................................................................... 10 (1) Monitoring locations ............................................................................................................... 10 1) Public water areas ................................................................................................................ 10 2) Groundwater ......................................................................................................................... 10 (2) Targets ..................................................................................................................................... 11 (3) Frequencies and periods ........................................................................................................ 11 (4) Conducted analyses................................................................................................................ 11 (5) Evaluation of measurement results ........................................................................................ 11 1) Comparison with the past measurement trends .................................................................... 11 2) Measures to be taken when a value deviating from the past measurement trends was detected ....................................................................................................................................... 12 2)-1 Release of preliminary values ........................................................................................... 12 2)-2 Detailed analyses and release of the results .................................................................... 12 (6) Disclosure of measurement results ....................................................................................... 13 2 Survey Methods and Analysis Methods .............................................................................................. 23 2.1 Survey methods ....................................................................................................................... 23 (1) Public water areas .................................................................................................................. 23 (2) Groundwater .......................................................................................................................... 24 2.2 Analysis methods ..................................................................................................................... 24 3 Results ................................................................................................................................................. 26 3.1 Detection of total β radioactivity and γ-ray emitting radionuclides .......................................... 26 (1) Public water areas .................................................................................................................. 26 1) Water ..................................................................................................................................... 26 2) Sediment ............................................................................................................................... 28 (2) Groundwater .......................................................................................................................... 30 3.2 Discussion regarding detected radionuclides .......................................................................... 32 (1) Detection of naturally occurring radionuclides ....................................................................... 32 1) Correlation between activity concentrations of K-40 in water samples and seawater ......... 32 2) Uranium and thorium series radionuclides in sediment samples ......................................... 35 (2) Detection of artificial radionuclides ........................................................................................ 38 1) Cs-134 and Cs-137 in water samples from public water areas ........................................... 38 2) Cs-134 and Cs-137 in sediment samples from public water areas ...................................... 39 i (i) Comparison with past Post-Earthquake Monitoring results within the same prefectures .... 40 (ii) Comparison with past Post-Earthquake Monitoring results for nearby locations ................ 42 (iii) Comparison with the data obtained from the Monitoring of Levels, etc. ............................ 43 3) Cs-134 and Cs-137 in groundwater ...................................................................................... 45 3.3 Survey to check annual variation ............................................................................................. 46 Part 2: Radioactive Material Monitoring in Water Environments in and around Fukushima Prefecture (FY2017) ..................................................................................................................................................... 52 1 Objective and Details ........................................................................................................................... 52 1.1 Objective .................................................................................................................................. 52 1.2 Details ...................................................................................................................................... 52 (1) Locations ................................................................................................................................ 52 (2) Targets .................................................................................................................................... 52 (3) Frequencies and periods ....................................................................................................... 52 (4) Conducted analyses............................................................................................................... 52 (5) Compilation and evaluation of results .................................................................................... 52 2 Survey Methods and Analysis Methods .............................................................................................. 54 2.1 Survey methods ....................................................................................................................... 54 2.2 Analysis methods ..................................................................................................................... 54 3 Outlines of the Results ........................................................................................................................ 55 3.1 Detection of radioactive cesium ............................................................................................... 55 (1) Public water areas (water) ..................................................................................................... 55 (2) Groundwater .......................................................................................................................... 55 (3) Public water areas (sediment) ............................................................................................... 55 1) Overall trends ........................................................................................................................ 55 2) Status by location .................................................................................................................. 56 3.2 Detection of radionuclides other than radioactive cesium ....................................................... 58 (1) Sr-89 and Sr-90 ...................................................................................................................... 58 (2) Other artificial radionuclides ................................................................................................... 58 4 Results ................................................................................................................................................. 59 4.1 Radioactive cesium .......................................................................................................................... 59 4.1 -1 Water .................................................................................................................................... 59 (1) Public water areas .................................................................................................................. 59 1) Rivers ...................................................................................................................................
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