Features of places/conditions that are likely to concentrate cesium and the result of measured data of those places

On this page we display the situations of places and conditions that easily create environmentally concentrated contamination (become micro hotspot) and measured results of those places. (We will publicize the data gradually after July 2017).
Cesium 134 has a half life of 2 years, but cesium 137 has a half life of 30 years. Therefore, once radioactive substances fall and accumulate on the ground, and the radiation is left alone, the place becomes micro hotspot. The cesium will continue to produce the radioactive ray.
When the radiation is spread out or diluted by wind and water or when they are decontaminated by cleaning,① the place is no longer a micro hotspot. Contamination can concentrate to create even higher contamination level, so places that have been contaminated by radiation should be measured and be checked if they are micro hotspot. When the contamination is highly

*Note: The measured result from Environmentally Concentrated Project are results of places that had highly concentrated contamination by radioactive cesium than the surroundings (micro hotspot that are approximately ten to several dozen centimeters square). Therefore, it is not the measured results of general contamination level of the area.


1. Under rain drainage

Radiation accumulates directly under the rain drainage because of the rain or snow that contain radiation and also radioactive substances that had accumulated on the roof that went down though the drainage. There is a greater tendency of having high contamination level especially when there is no drainage ditch and the contamination sank into the soil or the concrete.


ID place air dose 1m
air dose 5cm
unit:μSv/h
Cs-134
(MDA)
unit:Bq/kg
Cs-137
(MDA)
unit:Bq/kg
measured date
(sampling date)
Ohter
1803 宮城県仙台市若林区卸町 1m:0.160
5cm:0.500
428±43
(32)
3219±322
(45)
2017-10-02
(2017-07-18)
detail
1766 宮城県柴田郡大河原町緑町 1m:0.130
5cm:0.940
2587±259
(50)
18680±1868
(107)
2017-10-01
(2017-07-17)
detail
1453 東京都江戸川区中央 1m:0.140
5cm:1.400
4615±462
(33)
31053±3106
(91)
2017-05-21
(2017-05-21)
detail
1836 宮城県栗原市栗駒岩ケ崎 1m:0.230
5cm:0.910
1205±121
(36)
9178±918
(67)
2017-10-02
(2017-07-18)
detail


2. Puddle

Radiation are concentrated in places that water gathers such as puddles due to the rain and snow that contains radiation. When there are more water gathering due to a dip on the road and so on, there is a tendency that the contamination level becomes even higher.


ID place air dose 1m
air dose 5cm
unit:μSv/h
Cs-134
(MDA)
unit:Bq/kg
Cs-137
(MDA)
unit:Bq/kg
measured date
(sampling date)
Ohter
740 東京都文京区後楽 1m:0.060
5cm:0.180
1968±197
(48)
9356±936
(90)
2016-05-28
(2016-05-28)
detail
1839 岩手県西磐井郡平泉町長島 1m:0.260
5cm:1.670
1930±193
(36)
14504±1451
(80)
2017-10-04
(2017-07-19)
detail
491 東京都千代田区霞が関 1m:0.060
5cm:0.150
430±86
(10)
2020±400
(13)
2016-03-22
(2016-03-11)
detail
1555 東京都中央区銀座 1m:0.080
5cm:0.230
633±64
(38)
4200±420
(57)
2017-05-29
(2017-05-28)
detail
1767 宮城県柴田郡柴田町槻木白幡 1m:0.260
5cm:1.210
8482±849
(59)
62762±180
(6277)
2017-10-01
(2017-07-17)
detail
626 東京都足立区東和 1m:0.050
5cm:0.150
1275±128
(33)
6103±611
(62)
2016-05-04
(2016-05-03)
detail
2011 福島県双葉郡葛尾村葛尾 1m:1.680
5cm:7.540
6054±606
(47)
45625±4563
(137)
2017-10-04
(2017-07-21)
detail
1091 栃木県那須塩原市千本松 1m:0.840
5cm:2.380
3846±385
(47)
21305±2131
(117)
2016-07-31
(2016-07-31)
detail
1418 福島県双葉郡浪江町小野田 1m:3.570
5cm:28.100
78310±7831
(103)
460752±46076
(443)
2017-03-05
(2017-02-25)
detail
492 埼玉県さいたま市浦和区北浦和 1m:0.060
5cm:0.060
180±39
(15)
857±171
(18)
2016-03-22
(2016-03-12)
detail
1164 宮城県角田市枝野 1m:0.300
5cm:1.980
7182±719
(41)
37538±3754
(132)
2016-11-05
(2016-08-03)
detail
703 東京都足立区中川1丁目 1m:0.150
5cm:0.800
3867±387
(50)
19338±1934
(118)
2016-05-24
(2016-05-23)
detail
1165 福島県福島市杉妻町 1m:0.280
5cm:1.180
3936±394
(52)
21355±2136
(125)
2016-11-05
(2016-08-04)
detail
2007 岩手県奥州市衣川区日向 1m:0.280
5cm:0.920
1628±163
(41)
12143±1215
(83)
2017-10-04
(2017-07-19)
detail
1311 千葉県我孫子市本町 1m:0.110
5cm:0.440
966±97
(43)
5131±514
(76)
2017-01-04
(2017-01-02)
detail
1349 福島県双葉郡富岡町本岡 1m:2.130
5cm:17.100
41723±4173
(82)
248607±24861
(344)
2017-03-05
(2017-02-24)
detail
1769 宮城県亘理郡亘理町沼頭 1m:0.080
5cm:0.410
2934±294
(50)
22049±2205
(114)
2017-10-01
(2017-07-17)
detail


3. Soil on the roadside

Usually, the center of the road is little higher than the sides of the road to create good drainage. Thus, radiation that had fallen onto the entire area of the road get washed to the sides of the road. It creates tendency that soil on the side of the roads have highly concentrated level of radioactive substances.


ID place air dose 1m
air dose 5cm
unit:μSv/h
Cs-134
(MDA)
unit:Bq/kg
Cs-137
(MDA)
unit:Bq/kg
measured date
(sampling date)
Ohter
705 埼玉県越谷市レイクタウン 1m:0.060
5cm:0.150
480±48
(29)
2386±239
(40)
2016-05-28
(2016-05-27)
detail
1269 千葉県印西市大森 1m:0.150
5cm:0.550
1140±115
(35)
6575±658
(64)
2017-03-05
(2017-01-02)
detail
631 東京都足立区島根 1m:0.070
5cm:0.170
1119±112
(44)
5526±553
(72)
2016-05-05
(2016-05-04)
detail
1235 千葉県松戸市松戸新田 1m:0.170
5cm:1.470
7001±701
(72)
40194±4020
(214)
2017-01-03
(2017-01-02)
detail
354 東京都葛飾区鎌倉 1m:0.110
5cm:0.300
2000±400
(28)
8980±1800
(33)
2016-01-04
(2016-01-03)
detail
456 東京都葛飾区金町 1m:0.150
5cm:0.620
4330±870
(54)
20600±4100
(65)
2016-01-04
(2016-01-03)
detail
1095 福島県双葉郡浪江町小野田 1m:7.950
5cm:22.200
55027±5503
(91)
302154±30216
(381)
2016-11-04
(2016-08-01)
detail
1419 福島県双葉郡浪江町上続町 1m:2.050
5cm:10.200
24514±2452
(70)
159492±15950
(273)
2017-03-05
(2017-02-27)
detail
627 東京都足立区島根 1m:0.040
5cm:0.150
2538±254
(44)
11989±1199
(96)
2016-05-05
(2016-05-04)
detail
1315 千葉県鎌ケ谷市鎌ケ谷 1m:0.100
5cm:1.130
4234±424
(59)
24348±2435
(159)
2017-01-04
(2017-01-04)
detail
1200 福島県福島市本町 1m:0.690
5cm:7.680
3980±398
(58)
21794±2180
(135)
2016-11-05
(2016-08-04)
detail
1662 福島県相馬郡飯舘村小宮 1m:5.700
5cm:9.360
11369±1137
(69)
83028±8303
(219)
2017-10-01
(2017-07-15)
detail
1661 福島県相馬郡飯舘村小宮 1m:0.630
5cm:6.910
12979±1298
(52)
95631±9564
(186)
2017-10-01
(2017-07-15)
detail
629 東京都足立区島根 1m:0.050
5cm:0.110
2528±253
(72)
12315±1232
(130)
2016-05-05
(2016-05-04)
detail
1729 福島県相馬郡飯舘村臼石 1m:1.350
5cm:6.220
4453±446
(44)
32134±3214
(125)
2017-10-01
(2017-07-15)
detail
1314 千葉県柏市西町 1m:0.240
5cm:1.250
2934±294
(54)
16333±1634
(130)
2017-01-03
(2017-01-02)
detail
2008 福島県双葉郡楢葉町上繁岡 1m:0.810
5cm:2.800
4488±449
(44)
35243±3525
(119)
2017-10-04
(2017-07-20)
detail
1312 千葉県柏市北柏 1m:0.110
5cm:0.970
1022±103
(38)
6160±617
(65)
2017-03-05
(2017-01-02)
detail


4. Parking edge

Radiation that had fallen onto the large surface area of parking (concrete surface) are move to lower area or downwind by rain and wind. Therefore, there is a tendency that parkings have highly contamination in particular areas.


ID place air dose 1m
air dose 5cm
unit:μSv/h
Cs-134
(MDA)
unit:Bq/kg
Cs-137
(MDA)
unit:Bq/kg
measured date
(sampling date)
Ohter
1015 栃木県那須塩原市千本松 1m:1.080
5cm:12.700
44291±4430
(92)
249008±24901
(378)
2016-11-05
(2016-07-30)
detail
1922 岩手県奥州市前沢区養ケ森 1m:0.510
5cm:3.620
11527±1153
(65)
85188±8519
(212)
2017-10-02
(2017-07-19)
detail
1659 栃木県日光市中宮祠 1m:0.850
5cm:2.040
2139±214
(41)
16509±1651
(89)
2017-10-01
(2017-07-14)
detail
1236 千葉県印西市木下 1m:0.210
5cm:0.950
2003±201
(43)
11167±1117
(99)
2017-01-03
(2017-01-02)
detail
1731 宮城県白石市郡山西堀 1m:0.390
5cm:2.030
6402±641
(59)
46539±4654
(167)
2017-10-01
(2017-07-16)
detail
809 東京都葛飾区新小岩 1m:0.160
5cm:0.510
2284±229
(46)
11138±1114
(94)
2016-05-29
(2016-05-29)
detail
844 東京都江戸川区上篠崎 1m:0.070
5cm:0.310
1643±165
(34)
7992±800
(67)
2016-05-30
(2016-05-29)
detail
1316 埼玉県三郷市三郷 1m:0.260
5cm:0.900
2952±296
(40)
17403±1741
(102)
2017-01-27
(2017-01-03)
detail
1764 宮城県白石市郡山西堀 1m:0.250
5cm:0.440
2617±262
(69)
18980±1899
(136)
2017-10-01
(2017-07-16)
detail


5. Inside of gutter

Inside of gutter showed especially high radioactive contamination due to the sewerage and sludge that have poured in from large area. It is recommended to measure the level of contamination before cleaning those places if the surrounding area has been contaminated.


ID place air dose 1m
air dose 5cm
unit:μSv/h
Cs-134
(MDA)
unit:Bq/kg
Cs-137
(MDA)
unit:Bq/kg
measured date
(sampling date)
Ohter
1558 千葉県流山市南流山 1m:0.183
5cm:1.470
4469±447
(34)
32016±3202
(91)
2017-06-10
(2017-06-09)
detail


6. Lower part of slope

There is a tendency that lower part of slopes has high concentration of radiation especially when the area easily gathers water and mud. In highly contaminated areas, we need to be cautious about drifts of radiation.


ID place air dose 1m
air dose 5cm
unit:μSv/h
Cs-134
(MDA)
unit:Bq/kg
Cs-137
(MDA)
unit:Bq/kg
measured date
(sampling date)
Ohter
2010 福島県双葉郡葛尾村葛尾 1m:1.060
5cm:5.250
6527±653
(49)
50295±5030
(145)
2017-10-04
(2017-07-21)
detail
706 埼玉県越谷市レイクタウン 1m:0.070
5cm:0.120
317±32
(28)
1555±156
(35)
2016-05-28
(2016-05-26)
detail
743 東京都葛飾区新小岩 1m:0.100
5cm:0.520
1775±178
(36)
9222±923
(73)
2016-05-29
(2016-05-29)
detail
1094 福島県二本松市金色 1m:0.610
5cm:4.530
3310±332
(31)
18095±1810
(85)
2016-11-05
(2016-07-31)
detail
1098 宮城県伊具郡丸森町筆甫 1m:0.520
5cm:1.930
6200±621
(42)
32619±3262
(127)
2016-11-05
(2016-08-02)
detail
1131 宮城県伊具郡丸森町筆甫 1m:0.430
5cm:2.700
12202±1221
(53)
63797±6380
(188)
2016-11-05
(2016-08-02)
detail
1420 福島県双葉郡浪江町苅宿 1m:3.320
5cm:20.400
43027±4303
(79)
268993±26900
(332)
2017-03-05
(2017-02-26)
detail
457 東京都千代田区霞が関 1m:0.080
5cm:0.130
167±33
(6)
770±154
(8)
2016-03-22
(2016-03-08)
detail
1234 福島県郡山市開成1丁目 1m:0.370
5cm:1.560
10124±1013
(68)
54495±5450
(208)
2016-11-05
(2016-08-05)
detail
1097 福島県南相馬市原町区高倉 1m:12.000
5cm:61.700
200216±20022
(477)
1073738±108374
(1976)
2016-10-29
(2016-08-01)
detail


7. Planter

Planters are one of the places where the concentration of radiation occur easily due to water with radiation being blocked inside in the planter. After the nuclear power plant’s accident, there is a high possibility that planters have not had the soil or the plant changed which creats high accumulation of radioactive substances.


ID place air dose 1m
air dose 5cm
unit:μSv/h
Cs-134
(MDA)
unit:Bq/kg
Cs-137
(MDA)
unit:Bq/kg
measured date
(sampling date)
Ohter
1554 東京都港区東新橋 1m:0.070
5cm:0.230
217±22
(16)
1402±141
(20)
2017-05-29
(2017-05-28)
detail
979 東京都港区台場 1m:0.050
5cm:0.130
252±26
(31)
1102±111
(36)
2016-06-05
(2016-06-04)
detail
3860 東京都葛飾区白鳥4-5 1m:0.240
5cm:1.060
3734±374
(45)
16654±1666
(112)
2016-04-18
(2016-04-16)
detail
1012 東京都港区台場 1m:0.090
5cm:0.130
356±36
(37)
1425±143
(45)
2016-06-05
(2016-06-04)
detail
1384 福島県双葉郡富岡町本岡 1m:3.060
5cm:13.200
31111±3112
(70)
180190±18019
(292)
2017-03-05
(2017-02-24)
detail
1486 東京都墨田区横網 1m:0.080
5cm:0.200
539±54
(36)
3688±369
(53)
2017-05-28
(2017-05-26)
detail
878 東京都文京区本郷 1m:0.090
5cm:0.300
1153±116
(43)
6036±604
(71)
2016-06-04
(2016-06-03)
detail
3827 東京都葛飾区金町4-15 1m:0.160
5cm:1.180
4708±471
(42)
21581±2152
(114)
2016-04-16
(2016-04-16)
detail
1768 宮城県岩沼市里の杜 1m:0.150
5cm:1.010
2484±249
(61)
18714±1872
(122)
2017-10-01
(2017-07-17)
detail
1552 千葉県我孫子市本町 1m:0.160
5cm:0.740
1470±147
(38)
9526±953
(76)
2017-05-28
(2017-05-28)
detail
945 東京都港区台場 1m:0.060
5cm:0.220
816±82
(38)
3537±354
(58)
2016-06-05
(2016-06-04)
detail
742 東京都文京区春日 1m:0.070
5cm:0.240
793±80
(41)
3753±376
(61)
2016-06-04
(2016-05-28)
detail
912 東京都江東区有明 1m:0.080
5cm:0.390
1010±101
(40)
4375±438
(65)
2016-06-05
(2016-06-04)
detail


8. Near the roots of tree

Near roots of trees are one of the places that had high concentration of radiation easily because leaves and brunches accumulates radiation that are carried by the rain and the snow.


ID place air dose 1m
air dose 5cm
unit:μSv/h
Cs-134
(MDA)
unit:Bq/kg
Cs-137
(MDA)
unit:Bq/kg
measured date
(sampling date)
Ohter
109 東京都足立区青井 1m:0.120
5cm:0.850
2544±255
(38)
10144±1015
(90)
2016-06-01
(2016-04-30)
detail
1014 東京都江戸川区南小岩 1m:0.130
5cm:0.354
1749±175
(44)
7245±725
(84)
2016-06-05
(2016-06-05)
detail


9. Side of Walls or buildings

Radiation on walls got washed by the rain and the snow and fallen into small space. Walls also created drift for rain and wind so that highly concentration of radioactive substances occurred easily.


ID place air dose 1m
air dose 5cm
unit:μSv/h
Cs-134
(MDA)
unit:Bq/kg
Cs-137
(MDA)
unit:Bq/kg
measured date
(sampling date)
Ohter
1519 東京都台東区浅草 1m:0.070
5cm:0.140
409±41
(37)
2641±265
(49)
2017-05-28
(2017-05-26)
detail


10. Black substances

Lichen and aglae concentrated radioactive cesium from its surroundings. When they become dry the contamination level can become really high. You can find them besides car parks and it looks like accumulation of black thin layers.


ID place air dose 1m
air dose 5cm
unit:μSv/h
Cs-134
(MDA)
unit:Bq/kg
Cs-137
(MDA)
unit:Bq/kg
measured date
(sampling date)
Ohter
281 東京都足立区中川 1m:0.110
5cm:0.190
1883±189
(47)
7808±781
(90)
2016-04-30
(2016-04-30)
detail
2009 福島県双葉郡楢葉町山田岡 1m:0.250
5cm:0.560
6941±695
(77)
51987±5199
(208)
2017-10-04
(2017-07-20)
detail
315 東京都足立区東和 1m:0.090
5cm:0.250
1457±146
(34)
6863±687
(68)
2016-05-04
(2016-05-03)
detail
1837 岩手県一関市千厩町千厩 1m:0.120
5cm:0.180
1731±174
(50)
12857±1286
(95)
2017-10-02
(2017-07-19)
detail
421 東京都葛飾区高砂 1m:0.090
5cm:0.090
1880±380
(63)
8910±1780
(75)
2016-01-04
(2016-01-03)
detail
2002 岩手県奥州市前沢区養ケ森 1m:0.400
5cm:0.500
2986±299
(74)
23314±2332
(146)
2017-10-02
(2017-07-19)
detail
1556 東京都中央区銀座 1m:0.070
5cm:0.130
405±41
(57)
2711±272
(69)
2017-05-29
(2017-05-28)
detail
843 東京都葛飾区新小岩 1m:0.160
5cm:0.510
2836±284
(71)
14050±1406
(135)
2016-05-29
(2016-05-29)
detail
1313 千葉県柏市北柏 1m:0.150
5cm:0.350
1628±163
(93)
9163±917
(153)
2017-01-03
(2017-01-02)
detail
1017 栃木県那須塩原市千本松 1m:1.030
5cm:4.490
4054±406
(93)
22960±2297
(182)
2016-11-05
(2016-07-30)
detail
776 東京都葛飾区新小岩 1m:0.090
5cm:0.270
1292±130
(50)
7002±701
(81)
2016-05-29
(2016-05-29)
detail
668 東京都葛飾区柴又 1m:0.120
5cm:0.230
3650±366
(44)
17386±1739
(108)
2016-05-15
(2016-05-15)
detail
1013 東京都江東区有明 1m:0.050
5cm:0.070
830±84
(98)
3941±395
(115)
2016-06-05
(2016-06-04)
detail
3893 東京都葛飾区水元公園4 1m:0.250
5cm:0.500
5372±538
(69)
25249±2525
(166)
2016-04-17
(2016-04-16)
detail
111 東京都足立区青井 1m:0.050
5cm:0.160
1414±142
(69)
5856±586
(106)
2016-05-01
(2016-04-30)
detail
669 東京都葛飾区亀有 1m:0.080
5cm:0.270
3847±385
(84)
20406±2041
(163)
2016-05-23
(2016-05-23)
detail
633 東京都足立区中川 1m:0.140
5cm:0.210
3566±357
(67)
17489±1749
(140)
2016-05-15
(2016-05-14)
detail
704 東京都葛飾区鎌倉 1m:0.060
5cm:0.360
6614±662
(74)
32860±3287
(182)
2016-05-26
(2016-05-25)
detail


11. Moss

Moss has tendency to accumulate radioactive substances and have high contamination level.


ID place air dose 1m
air dose 5cm
unit:μSv/h
Cs-134
(MDA)
unit:Bq/kg
Cs-137
(MDA)
unit:Bq/kg
measured date
(sampling date)
Ohter
1096 福島県双葉郡浪江町樋渡 1m:2.270
5cm:11.300
39535±3954
(86)
222892±22290
(340)
2016-11-05
(2016-08-01)
detail


12. Dusts

In daily lives sometimes radiation gathers or concentrates without intention. Rise or concentration in dose of radio activity in air happen easily by gathering mud from gutter, sweeping and gathering fallen leaves, shoveling snow on the roads and so on.


ID place air dose 1m
air dose 5cm
unit:μSv/h
Cs-134
(MDA)
unit:Bq/kg
Cs-137
(MDA)
unit:Bq/kg
measured date
(sampling date)
Ohter
1592 千葉県流山市西初石 1m:0.490
5cm:1.470
2257±226
(34)
14805±1481
(74)
2017-06-11
(2017-06-10)
detail
1593 千葉県流山市加 1m:0.460
5cm:2.010
2353±236
(31)
15963±1597
(69)
2017-06-15
(2017-06-14)
detail
2168 福島県いわき市平梅本 1m:0.270
5cm:0.870
467±47
(31)
3290±330
(42)
2017-10-04
(2017-07-21)
detail
1730 福島県福島市渡利 1m:1.100
5cm:10.610
54769±5477
(114)
402626±40263
(451)
2017-10-01
(2017-07-16)
detail
1553 千葉県流山市南流山 1m:0.180
5cm:1.470
3555±356
(50)
23049±2305
(120)
2017-05-28
(2017-05-27)
detail
1559 千葉県流山市西初石 1m:0.450
5cm:2.680
7691±770
(49)
53071±5308
(143)
2017-06-10
(2017-06-10)
detail
1557 千葉県流山市加 1m:0.520
5cm:2.220
3766±377
(28)
25413±2542
(73)
2017-06-04
(2017-06-04)
detail
1233 福島県福島市蓬莱町5丁目 1m:0.680
5cm:4.820
15205±1521
(49)
78750±7875
(184)
2016-11-05
(2016-08-05)
detail
1626 千葉県柏市柏の葉 1m:0.310
5cm:0.870
643±65
(26)
4666±467
(39)
2017-06-21
(2017-06-16)
detail
1838 岩手県一関市千厩町千厩 1m:0.130
5cm:1.110
7381±739
(52)
55138±5514
(159)
2017-10-02
(2017-07-19)
detail
1802 宮城県刈田郡蔵王町曲竹 1m:0.150
5cm:0.250
120±13
(21)
823±83
(22)
2017-10-02
(2017-07-17)
detail
1092 栃木県那須塩原市千本松 1m:2.520
5cm:6.780
15109±1511
(58)
85388±8539
(207)
2016-11-05
(2016-07-31)
detail