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Space radiation dose local measurement result (October 19, 2020 update) of park, green tract of land

Updated: October 19, 2020

　The measurement results to date have been stable and are below the Ministry of the Environment standard (0.23 microsieverts per hour). Measurement of radiation dose has been suspended since 2017.
In addition, the measurement near the monument in Yosu Park was carried out once a year (August), but from 2021 onwards, the numerical value is stable and within the standard value. In the Tokyo metropolitan area, the radiation monitoring posts in Shinjuku Ward, which had been installed before the Great East Japan Earthquake, have dropped to the level before the earthquake. increase. However, if any concerns arise, the measurement will be resumed immediately.

Measurement results (conducted in 2016)

Name of facility measuring date weather Measurement location Measured value (unit: microsieverts per hour)
1 centimeter on the ground
Ozawamine Children's Park November 25 sunny on the lawn (center) 0.059
Masu (south side) 0.057
Persimmon Tree Children's Square December 2 sunny under the slide 0.045
horizontal bar 0.058
Sakura Park December 5th sunny sandbox 0.070
North entrance 0.063
Shimotsukado Children's Square December 5th sunny under the slide 0.054
Square 0.057
Sunami Park December 2 sunny Masu (southwest side) 0.055
Square (near playground equipment) 0.068
Fureai Children's Square December 2 sunny sandbox 0.043
under the swing 0.043
Matsuba Park December 5th sunny Masu (southwest side) 0.059
Square 0.065
Near health playground equipment 0.060
Misawa River Water Park December 5th sunny Near the toilet 0.043
under the stairs (river) 0.047
Kadanmae Square 0.058
(Tentative) Misawa River Yanoguchi Water Park December 5th sunny Square 0.080
under the stairs 0.061
Yanoguchi Kamijuku Children's Park December 6th sunny sandbox 0.054
Square 0.060
Yanoguchi Mitani Children's Park December 5th sunny sandbox 0.049
under the bench 0.058
Yanoguchijuku Mitani Children's Park December 6th sunny Masu (near the iron bar) 0.059
under the slide 0.068
Yanoguchi Nakajima Children's Park December 5th sunny sandbox 0.045
under the slide 0.048
Yanoguchi Nakafuji Children's Park December 6th sunny sandbox 0.046
near the entrance 0.049
Yanoguchi Nishinakajima Children's Park December 6th sunny sandbox 0.052
Near planting 0.058
Yanoguchi Negata Children's Park December 2 sunny under the slide 0.058
sandbox 0.040
Landzaka Park November 25 sunny sandbox 0.053
Masu (near the slide) 0.056
(Tentative name) Yanoguchi No. 1 Green Space December 5th sunny under the bench 0.064
Square 0.063
Awayuki Park November 29th sunny sandbox 0.040
Square (near the disaster prevention warehouse) 0.048
Bamaike Park November 29th sunny sandbox 0.054
Masu (northeast side) 0.061
Inagi Kita Ryokuchi Park August 24th sunny Under complex playground equipment 0.055
Gateball field south 0.045
picnic area 0.046
Masu (in front of the restroom in the multipurpose square) 0.038
Inside Tamari Park 0.059
Yoshikata Park November 29th sunny Masu (south side entrance) 0.057
sandbox 0.050
pavilion 0.063
Masu (north entrance) 0.062
Jogu Park August 24th cloudy Drinking fountains 0.047
sandbox 0.037
Under the bench (north side) 0.045
Sachikata Park November 29th sunny sandbox 0.058
under the swing 0.071
Suishabashi Park November 29th sunny center of the square 0.070
Sugahorinaka Park December 6th sunny Gutter (waterway side) 0.061
near the entrance 0.056
Higashi Naganuma Shinmachi Children's Park December 7 cloudy center of the square 0.063
Higashinaganuma Seibu Park December 7 cloudy under the swing 0.058
near the entrance 0.064
Higashinaganuma Seibu 2nd Park December 7 cloudy Near south entrance 0.072
square corner 0.069
Higashi Naganuma Nanamagari Miharashi Children's Park (north side) December 19th sunny horizontal bar 0.067
Gutter (center) 0.081
stair landing 0.063
Higashi Naganuma Nanamagari Miharashi Children's Park (west side) December 19th sunny under the bench 0.071
Higashi-Naganuma Nanamagari Miharashi Children's Park (east side) December 19th sunny sandbox 0.050
Near the east entrance 0.068
Hongo Park November 29th sunny Northeast side entrance 0.082
sandbox 0.042
Shimoshinden Children's Park December 6th sunny sandbox 0.044
under the swing 0.052
Kameyamashita Park November 29th sunny sandbox 0.041
Under complex playground equipment 0.043
Daimaru Park November 7 sunny sandbox 0.045
flow 0.075
Masu (northeast side) 0.056
Daimaru Park (parking lot) November 7 sunny box 0.067
Daimaru Ohori Children's Park November 25 sunny sandbox 0.047
under the slide 0.063
Daimarukawarakata Children's Park November 25 sunny Masu (east side) 0.055
sandbox 0.037
Daimaru Nature Park November 7 sunny under the bench 0.076
Daimaru Water Park December 20th cloudy Daimaru Garden 0.079
Daimaru District Hall Square 0.046
Yanagiike Square 0.046
Zelkova Square 0.064
wisteria trellis 0.051
Daimaru Daini Park November 25 sunny Lawn Square (West) 0.061
Masu (east side) 0.060
Daimaru Tenjin Yamashita Children's Park December 7 cloudy sandbox 0.058
Masu (near the entrance) 0.051
Daimaru Benten Children's Park November 25 sunny sandbox 0.051
Masu (east side) 0.061
Daimaru Yato River Side Children's Square November 25 sunny sandbox 0.048
Daimarutaniyama Park November 25 sunny sandbox 0.060
next to the garden path 0.072
Kawarata 2nd Park November 25 sunny Masu (east side) 0.062
Near west entrance 0.069
Touhou Park December 7 cloudy under the slide 0.050
Masu (east side) 0.053
Yamazaki Park November 25 sunny Masu (beside the pond) 0.070
under the slide 0.057
Near the pavilion 0.067
Kizume Square November 7 sunny Near west entrance 0.056
Under the bench (east side) 0.057
Tate Shrine Park November 15th cloudy Masu (near the bench) 0.045
Egg Square Park November 15th cloudy sandbox 0.036
Masu (east side) 0.049
Tenjinyama Higashi Park December 7 cloudy sandbox 0.056
Masu (east side) 0.056
Toki no Hiroba November 15th cloudy under the swing 0.043
sandbox 0.036
Shiramichi Children's Square December 7 cloudy sandbox 0.060
Near west entrance 0.060
Matsunodai Square November 15th cloudy flower bed 0.056
Hyakuson Iriyato Children's Park December 19th sunny Masu (east side) 0.084
Masu (near the swing) 0.076
Hyakumura Shinka Children's Park December 19th sunny Near the east entrance 0.057
sandbox 0.050
Masu (in front of the swing) 0.051
Sakahama Central Children's Square November 2 cloudy under the swing 0.047
grass 0.055
Sakahama Tenman Shrine Children's Square November 2 cloudy horizontal bar 0.038
Shimohirao Children's Park November 21st cloudy Masu (the center of the park) 0.039
sandbox 0.046
Shitaya Park November 21st cloudy sandbox 0.044
Masu (near the entrance) 0.042
Dankiba Park November 16th cloudy sandbox 0.055
Masu (southwest side) 0.059
Nakayoshi Children's Square November 16th cloudy sandbox 0.036
under the bench 0.034
Hirao Children's Park November 21st cloudy gutter 0.067
horizontal bar 0.060
Hirao Perimeter Green Space November 21st cloudy Under the bench (near the bus stop) 0.068
Hirao Neighborhood Park November 16th cloudy Sandbox (below the slide) 0.043
sandbox 0.058
multipurpose square 0.037
under the bench 0.044
healthy playground equipment 0.050
Hirao Sannohashi Children's Park November 21st cloudy under the bench 0.057
North entrance 0.061
Hiraoirijozuka Children's Park November 21st cloudy Under the bench (west side) 0.035
sandbox (west side) 0.053
center of the square 0.044
Entrance (east side) 0.061
Sandbox (east side) 0.045
Hirao Peace Children's Park November 21st cloudy Masu (west side) 0.060
under the bench 0.064
Hirao Maruyama Children's Park November 21st cloudy sandbox 0.041
under the bench 0.032
Hirao Mukaiyama Children's Park November 21st cloudy sandbox 0.050
Masu (west side) 0.060
Hirao Meotozaka Children's Park November 21st cloudy round chair 0.033
Square 0.028
Hiraoyato Park November 21st cloudy Near the spring playground equipment 0.048
Masu (east side) 0.087
Masu (north side) 0.085
Hirao Yamaboshi Park November 21st cloudy sandbox 0.050
Masu (the center of the park) 0.047
Oshidate Acacia Forest Strolling Green Space December 6th sunny About 100m from the east entrance 0.071
About 220m from the east entrance 0.074
About 350m from the east entrance 0.071
Inagi Ohashi Fureai Park August 24th sunny center of the square 0.065
Near north entrance 0.054
Oshitate Children's Park December 5th sunny under the swing 0.071
sandbox 0.059
Oshitate Triangular Children's Square December 5th sunny under the swing 0.071
slide entrance 0.065
Oshidatenakaseki Children's Park December 6th sunny sandbox (below the net) 0.057
Masu (south side) 0.052
Oshitabori Park December 5th sunny flower bed 0.056
under the pergola 0.053
waterfront 0.063
Kaminoseki Children's Square August 24th sunny under the swing 0.053
entrance 0.048
Tonboike Children's Square December 6th sunny Square (North) 0.066
sandbox 0.050
Oshitate Kawamahori Park August 24th sunny near the entrance 0.047
under the slide 0.042
Inagi Central Park (baseball field) November 4th sunny sandbox (large) 0.049
sandbox (small) 0.046
Rabbit Park November 7 sunny sandbox 0.051
Masu (Cultural Center side) 0.061
Ushisan Park November 15th cloudy sandbox 0.046
drinking fountain 0.065
Horse Park November 15th cloudy Masu (near the south entrance) 0.054
sandbox 0.054
Kamesan Park November 15th cloudy sandbox 0.059
drinking fountain 0.076
Shiroyama Park November 4th sunny Masu (near the rest house) 0.077
Masu (water square) 0.064
pond 0.051
Torisan Park November 7 sunny sandbox 0.043
Near north entrance 0.058
Sheep Park November 7 sunny Masu (south side) 0.047
sandbox 0.052
Mole Park December 7 cloudy Masu (near the slide) 0.062
central lawn 0.055
Masu (near the disaster prevention warehouse) 0.060
Taniyama Green Space December 7 cloudy Masu (south side) 0.064
under the bench 0.047
Masu (east side) 0.075
1-I green space December 7 cloudy under the bench 0.063
Inagi Central Park November 14th cloudy Masu (near Whale Bridge) 0.047
Multipurpose lawn open space 0.047
Masu (near the pond) 0.049
sandbox 0.045
Observatory drinking fountain 0.064
Kaze no Hiroba Park November 10th sunny sandbox 0.057
Masu (near the steel tower) 0.059
Sora no Hiroba Park November 10th sunny sandbox 0.047
Masu (south side) 0.076
Hikari no Hiroba Park November 10th sunny Masu (southwest side) 0.064
sandbox 0.047
2-W green space December 19th sunny box 0.050
under the bench 0.054
Enoki Park November 2 cloudy Masu (square) 0.052
under the swing 0.052
Masu (south side) 0.054
Obeya Hachimangu Playground November 2 cloudy under the torii gate 0.063
Kamiyato Water Park November 10th cloudy under the slide 0.070
Under the bench (near the field) 0.059
Kamikawa Hashishita 0.076
Retaining wall side 0.063
beside the stairs 0.055
Under the bench (pergola) 0.062
Keyaki Park November 2 cloudy sandbox 0.050
Masu (east side) 0.057
Kobushi Park November 2 cloudy Masu (east side) 0.056
sandbox 0.055
Miharashi Green Space (Block 3-6 Park) November 10th sunny Masu (next to the slide) 0.049
Miharashi green area (3-B green area) November 10th sunny hill lawn 0.042
square lawn 0.060
Miharashi green area (3-C green area) November 10th sunny under the bench 0.056
Miharashi green area (3-E green area) November 10th sunny under the bench 0.049
Miharashi green area (3-G green area) November 10th cloudy under the bench 0.061
Yamazakura Park November 2 cloudy sandbox 0.052
Masu (southwest side) 0.054
Yotsuozawa Green Space November 2 cloudy under the bench 0.046
Wakabadai Park November 2 cloudy Terraced square of flowers 0.057
Masu (beside the pond) 0.051
Masu (circular square) 0.049
under the net tree 0.033
Masu (near complex playground equipment) 0.043
Wakabadai Park (multipurpose square) November 2 cloudy Masu (third parking lot) 0.069
Masu (in front of the toilet) 0.056
grass 0.058
Wakabadai Park (3F green area) November 2 cloudy in woodland 0.061
under the bridge 0.059
3-O Green Space November 2 cloudy top of the hill 0.041
Masu (northeast side) 0.053

【explanation】
When converted from 0.23 microsieverts per hour to 0.99864 millisieverts per year, it is lower than the radiation dose index (1 millisievert or less per year (excluding natural radiation dose, etc.)) recommended by the International Commission on Radiological Protection (ICRP) for ordinary people to receive.
According to the Ministry of the Environment's "Decontamination Guidelines", if the radiation dose at 1 meter above the ground is below 0.23 microsieverts per hour, no further action will be taken.

Measurement overview

Measurer

city official

measuring equipment

PA-1000

Measuring method

Average of 5 repeated measurements every 60 seconds (PA-1000)

Past measurement results

File Download Opens in a new window.Parks and green spaces (PDF: 477KB)

About cleaning

< Doubt ( ) Parks >
During measurements taken in 2012 near a monument in the park, the radiation level was measured to be over 0.23 microsieverts per hour, so work was carried out to reduce the radiation levels through cleaning.
After cleaning the monument with a high-pressure washer and brushing, the radiation levels were measured and found to be below the standard level (see "Past Measurement Results" for the figures).

follow-up

We regularly measure the areas where we have cleaned and observe the progress. Follow-up results are as follows.

measuring date Jogu Park
monument
2012 May 21st 0.194
August 21 0.185
November 27th 0.210
2013 February 21st 0.198
May 21st 0.178
August 21 0.203
November 20th 0.170
2014 February 21st 0.192
May 22nd 0.180
August 25th 0.188
November 21st 0.201
2015 February 20th 0.205
May 21st 0.193
August 20th 0.201
November 24th 0.199
2016 February 18th 0.199
June 2 0.163
August 24th 0.172
December 16th 0.164
2017 February 24th 0.162
August 17th 0.160
2018 August 31st 0.158
2019 August 21 0.149
Reiwa 2nd year August 21 0.128

[Measurement overview]
Measurer
city ​​official
measuring equipment
PA-1000
Measuring method
Average of 5 repeated measurements every 60 seconds (PA-1000)
measured value
Unit: microsieverts per hour (1 centimeter on the surface of the earth)

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Inquiries about this page

Inagi City Urban Construction Department Civil Engineering Division
2111 Higashi Naganuma, Inagi City, Tokyo
Phone: 042-378-2111 Fax: 042-378-4781

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