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Local measurement results of air radiation dose in parks and green areas (updated on October 19, 2020)

Update date: October 19, 2020

　The measurement results to date have been stable and are below the Ministry of the Environment's standard value (0.23 microsieverts per hour). Radiation dose measurements have been suspended since 2017.
In addition, measurements near the monuments in Gosu Park were carried out once a year (in August), but since 2021, the values ​​have been stable and within standard values. In Tokyo, measurements of air radiation levels in the city have been suspended due to reasons such as the numbers at radiation monitoring posts in Shinjuku Ward, which had been set up before the Great East Japan Earthquake, dropping to pre-earthquake numbers. Masu. However, if any concerns arise, measurements will be resumed immediately.

Measurement results (implemented in FY2016)

Name of facility measuring date weather Measurement location Measured value (unit: microsievert per hour)
1 cm above ground
Ozamine 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
Under the iron 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 Chibikko 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 play equipment 0.060
Misawa River Waterfront Park December 5th sunny Near the toilet 0.043
Under the stairs (river) 0.047
Square in front of flower bed 0.058
(Temporary) Misawa River Yanoguchi Waterfront 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 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
Yanokuchi 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 area 0.058
Yanoguchi Negata Children's Park December 2 sunny Under the slide 0.058
sandbox 0.040
Land Saka Park November 25 sunny sandbox 0.053
Masu (near the slide) 0.056
(tentative name) Yanoguchi Daiichi Green Space December 5th sunny Under bench 0.064
square 0.063
Awayuki Park November 29th sunny sandbox 0.040
Plaza (near the disaster prevention storehouse) 0.048
Kamaike Park November 29th sunny sandbox 0.054
Masu (northeast side) 0.061
Inagi Kita Ryokuchi Park August 24th sunny Composite playground equipment bottom 0.055
Gateball field south 0.045
picnic area 0.046
Masu (in front of the multipurpose plaza toilet) 0.038
Inside Tamari Park 0.059
Yoshikata Park November 29th sunny Masu (south entrance) 0.057
sandbox 0.050
pavilion 0.063
Masu (north entrance) 0.062
Gosu Park August 24th cloudy Drinking fountains 0.047
sandbox 0.037
Under the bench (north side) 0.045
Yukikata Park November 29th sunny sandbox 0.058
Under the swing 0.071
Suijimbashi Park November 29th sunny Center of the square 0.070
Sugahorinaka Park December 6th sunny Gutter (canal side) 0.061
Near the entrance 0.056
Higashi Naganuma Shinmachi Children's Park December 7 cloudy Center of the square 0.063
Higashi-Naganuma Western Park December 7 cloudy Under the swing 0.058
Near the entrance 0.064
Higashi-Naganuma Western Daini Park December 7 cloudy Near the south entrance 0.072
square corner 0.069
Higashi-Naganuma Nanamagari Miharu Children's Park (north side) December 19th sunny Under the iron bar 0.067
Gutter (center) 0.081
stair landing 0.063
Higashi-Naganuma Nanamagari Miharu Children's Park (west side) December 19th sunny Under bench 0.071
Higashinagumanuma Shichimagarimihara Children's Park (East side) December 19th sunny sandbox 0.050
Near the east entrance 0.068
Hongo Park November 29th sunny Northeast 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
Composite playground equipment bottom 0.043
Daimaru Park November 7th sunny sandbox 0.045
flow 0.075
Masu (northeast side) 0.056
Daimaru Park (parking lot) November 7th sunny Masu 0.067
Daimaru Ohori Children's Park November 25 sunny sandbox 0.047
Under the slide 0.063
Omaru Kawarakata Children's Park November 25 sunny Masu (east side) 0.055
sandbox 0.037
Daimaru Nature Park November 7th sunny Under bench 0.076
Daimaru water park December 20th cloudy Daimaru Garden 0.079
Daimaru District Hall Square 0.046
Willow Pond Square 0.046
Keyaki 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 Yatogawa Children's Square November 25 sunny sandbox 0.048
Daimaru Taniyama Park November 25 sunny sandbox 0.060
Next to the garden path 0.072
Kawarakata Second Park November 25 sunny Masu (east side) 0.062
Near the 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 gazebo 0.067
Kizume Square November 7th sunny Near the west entrance 0.056
Under the bench (east side) 0.057
Tatejinja Park November 15th cloudy Masu (near the bench) 0.045
Egg Square Park November 15th cloudy sandbox 0.036
Masu (east side) 0.049
Tenjin Yamahigashi Park December 7 cloudy sandbox 0.056
Masu (east side) 0.056
Time Square November 15th cloudy Under the swing 0.043
sandbox 0.036
Shiramichi Children's Square December 7 cloudy sandbox 0.060
Near the west entrance 0.060
Matsunodai Square November 15th cloudy flower bed 0.056
Hyakumura Iriyato Children's Park December 19th sunny Masu (east side) 0.084
Masu (near the swing) 0.076
Hyakumurashinka 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 Tenma Shrine Children's Square November 2 cloudy Under the iron bar 0.038
Shimohirao Children's Park November 21st cloudy Masu (center of the park) 0.039
sandbox 0.046
Shimotani 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 bench 0.034
Hirao Children's Park November 21st cloudy gutter 0.067
Under the iron bar 0.060
Hirao outer green area November 21st cloudy Under the bench (near the bus stop) 0.068
Hirao neighborhood park November 16th cloudy Sandbox (under the slide) 0.043
sandbox 0.058
Multipurpose Plaza 0.037
Under bench 0.044
healthy play equipment 0.050
Hirao Sannobashi Children's Park November 21st cloudy Under bench 0.057
North entrance 0.061
Hirao Iridadzuka 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 bench 0.064
Hirao Maruyama Children's Park November 21st cloudy sandbox 0.041
Under bench 0.032
Hirao Mukoyama Children's Park November 21st cloudy sandbox 0.050
Masu (west side) 0.060
Hirao Meotozaka Children's Park November 21st cloudy Under the round chair 0.033
square 0.028
Hiraoyato Park November 21st cloudy Near 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 (center of the park) 0.047
Oshidate Acacia Forest Walking Green Space December 6th sunny Approximately 100m from the east entrance 0.071
Approximately 220m from the east entrance 0.074
Approximately 350m from the east entrance 0.071
Inagi Ohashi Community Park August 24th sunny Center of the square 0.065
Near the north entrance 0.054
Oshitate Children's Park December 5th sunny Under the swing 0.071
sandbox 0.059
Oshidate Triangle Children's Square December 5th sunny Under the swing 0.071
slide entrance 0.065
Oshidate Nakanoseki Children's Park December 6th sunny Sandbox (under the net) 0.057
Masu (South side) 0.052
Oshidatebori Park December 5th sunny flower bed 0.056
under pergola 0.053
waterside 0.063
Kaminoseki Children's Square August 24th sunny Under the swing 0.053
entrance 0.048
Dragonfly Pond Children's Square December 6th sunny Plaza (north) 0.066
sandbox 0.050
Oshidate Kawamabori 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
Bunny Park November 7th sunny sandbox 0.051
Masu (Cultural Center side) 0.061
Ushisan Park November 15th cloudy sandbox 0.046
Drinking fountain 0.065
Umasan 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 7th sunny sandbox 0.043
Near the north entrance 0.058
Sheep Park November 7th sunny Masu (South side) 0.047
sandbox 0.052
Mole-san 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 bench 0.047
Masu (east side) 0.075
1-I green space December 7 cloudy Under bench 0.063
Inagi Central Park November 14th cloudy Masu (near Kujira Bridge) 0.047
Multipurpose lawn space 0.047
Masu (near the pond) 0.049
sandbox 0.045
Observatory drinking fountain 0.064
Wind Square Park November 10 sunny sandbox 0.057
Masu (near the steel tower) 0.059
Sky Square Park November 10 sunny sandbox 0.047
Masu (South side) 0.076
Light Square Park November 10 sunny Masu (southwest side) 0.064
sandbox 0.047
2-W Green Space December 19th sunny Masu 0.050
Under bench 0.054
Enoki Park November 2 cloudy Masu (square) 0.052
Under the swing 0.052
Masu (South side) 0.054
At Room Hachimangu Shrine Playground November 2 cloudy Under the torii gate 0.063
Kamiyato Water Park November 10 cloudy Under the slide 0.070
Under the bench (near the field) 0.059
Under the Kamikawa Bridge 0.076
Next to retaining wall 0.063
Next to 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 (3-6 block park) November 10 sunny Masu (next to the slide) 0.049
Miharashi Green Space (3-B Green Space) November 10 sunny hill lawn 0.042
square lawn 0.060
Miharashi Green Space (3-C Green Space) November 10 sunny Under bench 0.056
Miharashi Green Space (3-E Green Space) November 10 sunny Under bench 0.049
Miharashi Green Space (3-G Green Space) November 10 cloudy Under bench 0.061
Yamazakura Park November 2 cloudy sandbox 0.052
Masu (southwest side) 0.054
Yotsuozawa green space November 2 cloudy Under bench 0.046
Wakabadai Park November 2 cloudy Flower terrace plaza 0.057
Masu (beside the pond) 0.051
Masu (circular square) 0.049
net tree bottom 0.033
Masu (near the playground equipment) 0.043
Wakabadai Park (multipurpose plaza) November 2 cloudy Masu (third parking lot) 0.069
Masu (in front of the toilet) 0.056
grass 0.058
Wakabadai Park (3-F green space) November 2 cloudy Inside the forest area 0.061
under the bridge 0.059
3-O green area November 2 cloudy top of the hill 0.041
Masu (northeast side) 0.053

【explanation】
The annual equivalent of 0.23 microsieverts per hour is 0.99864 millisieverts, which is an indicator of the normal radiation dose received by the general public (less than 1 millisievert per year (natural radiation dose, etc.), as recommended by the International Commission on Radiological Protection (ICRP). )), this value is the city's criterion value .
According to the Ministry of the Environment's "Decontamination-related Guidelines," if the radiation dose at 1 meter of the ground surface is below 0.23 microsieverts per hour, no further action will be taken, but the city is on the safer side. We make decisions based on measurements taken at the closest location to the object (1 centimeter above the ground) while standing.

Measurement overview

Measurer

City staff

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)

Regarding cleaning etc.

< 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 cleaning has been carried out and monitor the progress. The results of follow-up observation are as follows.

measuring date Gosu Park
monument
2012 May 21 0.194
August 21 0.185
November 27th 0.210
2013 February 21st 0.198
May 21 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 20 0.205
May 21 0.193
August 20th 0.201
November 24 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 17 0.160
2018 August 31st 0.158
2019 August 21 0.149
Reiwa 2 August 21 0.128

[Measurement overview]
Measurer
City staff
measuring equipment
PA-1000
Measuring method
Average of 5 repeated measurements every 60 seconds (PA-1000)
measured value
Unit: microsievert per hour (1 centimeter of the earth's surface)

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Inquiries about this page

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

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