Readings of the Second Fukushima Prefecture Environmental Radiation Monitoring in Mesh Survey (Definite Values)
Total Page:16
File Type:pdf, Size:1020Kb
Readings of the Second Fukushima Prefecture Environmental Radiation Monitoring in Mesh Survey (Definite Values) November 29, 2011 Local Nuclear Emergency Response Headquarters (Radioactivity Team) Disaster Provision Main Office of Fukushima Pref. (Nuclear Power Team) The results of air dose rate monitoring based on “The Second Fukushima Prefecture Environmental Radioactivity Monitoring in Mesh Survey Action Plan,” issued on August 11, 2011, are as follows. 1 Monitoring Outline (1) Monitoring Date From Wednesday, August 17 to Wednesday, September 7, 2011 (2) Number of Monitoring Locations 2,776 locations (Locations monitored in the previous survey: 1,779; Locations newly added: 997) 2 Monitoring Results (1) Monitoring Results for this Report Readings in Monitoring the previous Segment Maximum value (μSv/h) Minimum value (μSv/h) locations survey (μSv/h) 0.13 Fukushima City/Iizaka Town 4.3 Moniwa Shitagama Date City/Tsukidate Town (Reading in the previous survey of 0.16 397 Kenpoku Tsukidate this location: 0.25) - (89) (Reading in the previous survey of Fukushima City/Iizaka Town 4.4 this location: - ) Moniwa Kurosawa (Reading in the previous survey of this location: 0.24) 1.4 Sukagawa City/Kitayokota Fuyoda 0.08 (Reading in the previous survey of Koriyama City/Konan Town Akatsu this location: 2.1) (Reading in the previous survey of Tamura City/Funehiki Town 0.12 942 this location: 0.13) Kenchu Kamiutsushi Shitamichi - (506) Koriyama City/Konan Town (Reading in the previous survey of 2.6 Funatsu Katagaibori this location: - ) (Reading in the previous survey of Miharu Town/Hirasawa Takatoya this location: 0.12) (Reading in the previous survey of this location: - ) Readings in Monitoring the previous Segment Maximum value (μSv/h) Minimum value (μSv/h) locations survey (μSv/h) 0.10 Yamatsuri Town/Higashidate Ishida 1.2 (Reading in the previous survey of Shirakawa City/Taishinkumado 0.12 279 this location: 0.14) Kennan Kaketsuka - (57) Yamatsuri Town/Shimosekigodo (Reading in the previous survey of 1.8 Tanakamae this location: 1.8) (Reading in the previous survey of this location: 0.12) 0.36 0.07 Yugawa Village/Kumanome 0.09 453 Aizu Misato Town/Asahiichikawa Aizu Kumakawa - (115) (Reading in the previous survey of (Reading in the previous survey of 0.88 this location: - ) this location: 0.46) 0.06 Shimogo Town/Ochiai (Reading in the previous survey of this location: 0.08) Minami Aizu Town/Nagano (Near Shimoosawa) (Reading in the previous survey of this location: - ) Minami Aizu Town/Nagano (Near Shimoyachi) (Reading in the previous survey of this location: 0.08) Minami Aizu Town/Tajima (Near Otsubo) (Reading in the previous survey of 0.17 this location: 0.08) 0.04 151 Minami Aizu Town/Izumita Minamiaizu Minami Aizu Town/Tajima - (21) (Reading in the previous survey of (Near Ushiroharako) 0.20 this location: 0.20) (Reading in the previous survey of this location: 0.08) Minami Aizu Town/Shioe (Near Uchishiroko) (Reading in the previous survey of this location: 0.08) Minami Aizu Town/Kaneizawa (Reading in the previous survey of this location: 0.09) Minami Aizu Town/Shizukawa (Reading in the previous survey of this location: 0.07) Minami Aizu Town/Tonyu (Reading in the previous survey of this location: 0.09) 0.11 5.2 Soma City/Isobe Ohama Minami Soma City/Haramachi (Reading in the previous survey of 0.18 203 Sousou Ward Takanokura this location: - ) - (78) (Reading in the previous survey of Shinchi Town/Tohama 6.8 this location: - ) (Reading in the previous survey of this location: - ) Readings in Monitoring the previous Segment Maximum value (μSv/h) Minimum value (μSv/h) locations survey (μSv/h) 3.4 0.07 Iwaki City/Kawamae Town 0.14 351 Iwaki City/Iwama Town Tsukahara Iwaki Shimookeuri - (131) (Reading in the previous survey of (Reading in the previous survey of 2.8 this location: 0.14) this location: - ) 0.06 Shimogo Town/Ochiai (Reading in the previous survey of this location: 0.08) Minami Aizu Town/Nagano (Near Shimoosawa) (Reading in the previous survey of this location: - ) Minami Aizu Town/Nagano (Near Shimoyachi) (Reading in the previous survey of this location: 0.08) Minami Aizu Town/Tajima (Near Otsubo) 5.2 (Reading in the previous survey of Minami Soma City/Haramachi this location: 0.08) 0.04 2,776 Total Ward Takanokura Minami Aizu Town/Tajima (Near - (997) (Reading in the previous survey of Ushirohara Ko) 6.8 this location: - ) (Reading in the previous survey of this location: 0.08) Minami Aizu Town/Shioe (Near Uchishiroko) (Reading in the previous survey of this location: 0.08) Minami Aizu Town/Kaneizawa (Reading in the previous survey of this location: 0.09) Minami Aizu Town/Shizukawa (Reading in the previous survey of this location: 0.07) Minami Aizu Town/Tonyu (Reading in the previous survey of this location: 0.09) * “Readings in the previous survey” exclude the data concerning the planned evacuation zones, where monitoring was not conducted in this survey, contained in the readings in Fukushima Prefecture Environmental Radiation Monitoring in Mesh Survey published May 2, 2011. * Monitoring was conducted at the height of 1m above the ground. * Figures in parentheses in the “Monitoring locations” column of the table show the number of locations newly added. They are described as “–” in the “Readings in the previous survey” column in the attached sheet, “Readings of the Second Fukushima Prefecture Environmental Radiation Monitoring in Mesh Survey (Preliminary Report).” (2) Surrounding Conditions and Current State of Major Monitoring Locations Locations with an air dose rate of 3.0μSv/h or Implementation Setting up of more status of detailed specific spots Conditions of survey in living recommend- Readings monitoring areas surrounding Segment Monitoring locations ed for (μSv/h) monitoring evacuation locations - One part of rural sites Nihonmatsu City Conducted the surrounded by forests Kamikawasaki Vehicle-Borne 3.4 - Approximately 2μSv/h Not set Itouchi/Near Nine District Monitoring in or less around areas with Meeting Place July. houses - Mountain area near the Date City Tsukidate Town Kenpoku border of Iidate Village Conducted the Tsukidate/Along 4.3 Set - There are no houses in detailed Prefectural Road 315 the area monitoring on Date City roads and - Mountain area Ryozen Town Kamioguni residences in June 3.0 - There are houses in the Set Chabatake/Near Oguni and July. area Chabatake Bus Stop Minami Soma City Haramachi Ward - Mountain area Takanokura/Near the 5.2 - There are no houses in Set entrance of Kunimiyama the area Nagame-no-oka Minami Soma City - Mountain area near Haramachi Ward Takanokura Dam 4.9 Set Takanokura/Near - There are no houses in Higashikunimi the area Minami Soma City - Mountain area near Haramachi Ward Takanokura Dam 4.5 Set Takanokura/Near Sanjin - There are no houses in Ohashi Bridge the area Conducted the detailed Minami Soma City monitoring on Sousou - Mountain area near Haramachi Ward Baba roads and Yokokawa Dam Omori/Akane Ohashi 3.7 residences in June Set - There are no houses in Bridge side of Akane and July. the area Tunnel Minami Soma City - Mountain area near Haramachi Ward Takanokura Dam 3.6 Set Takanokura/Near - There are houses in the Shirigake area - Mountain area near Minami Soma City Yokokawa Dam, one Haramachi Ward 3.6 part of rural sites Set Katakurahayama - There are no houses in the area - Mountain area near the Minami Soma City border of Iidate Village Haramachi Ward 3.3 Set - There are no houses in Jisabara/Yagisawa Bridge the area Locations with an air dose rate of 3.0μSv/h or Implementation Setting up of more status of detailed specific spots Conditions of survey in living recommende Readings monitoring areas surrounding Segment Monitoring locations d for (μSv/h) monitoring evacuation locations Conducted the detailed Minami Soma City - Foot of the mountain monitoring on Sousou Haramachi Ward 3.3 - There are houses in the Set roads and Ogai Sanorin area residences in June and July. - Mountain area near the Conducted the Kawauchi Village border of Iwaki City detailed Sousou Near 3.5 Set - There are no houses in monitoring on Shimokawauchi/Mitsuishi the area residences in July. Conducted the Vehicle-Borne - Mountain area near the Iwaki City/Kawamae Monitoring in border of Iidate Village Iwaki Town Shimookeuri 3.4 June, and the Not set - There are no houses in detailed the area monitoring on residences in July. (3) Comparison with the Previous Survey (conducted in April 2011) (Unit of the greatest amount of change: μSv/h) Increased Decreased Unchanged Total No. of Greatest No. of Greatest No. of No. of Segment locations amount of locations amount of locations locations change change Kenpoku 1 0.11 306 -2.4 1 308 Kenchu 1 0.01 435 -1.47 0 436 Kennan 0 - 220 -0.79 2 222 Aizu 7 0.03 319 -0.57 12 338 Minamiaizu 20 0.08 86 -0.08 24 130 Sousou 1 0.02 124 -2.6 0 125 Iwaki 0 - 220 -1.4 0 220 Total 30 0.11 1,710 -2.6 39 1,779 Air dose rates in Fukushima Prefecture are on a declining trend as a whole, in comparison to those in the previous survey. However, the air dose rates in some locations, particularly in Aizu and Minamiaizu Segments, have been increasing slightly. Additional monitoring will be conducted as necessary to grasp the dose rate status in the prefecture. Contour figures will be made and published based on the results of this survey. (Inquiries: Monitoring Team, Radioactivity Team Tel: 024-521-1917) Readings of the Second Fukushima Prefecture Environmental Radiation Monitoring in Mesh Survey * This survey was not conducted in restricted areas and planned evacuation areas, so such areas have been left blank.