Local Measurement Results of Space Radiation Levels in Sports Facilities (Updated January 15, 2017)

In accordance with the city's policy for measuring ambient radiation levels, measurements of ambient radiation levels were conducted within the sports facilities, and the results are hereby announced.
Furthermore, there were no areas identified in this measurement that require cleaning or other actions (areas exceeding the threshold value of 0.23 microsieverts per hour).
Since the establishment of new sports facilities in fiscal year 2015, Nagamine Sports Plaza has been added, and new measurements are being conducted.

Measurement Results (Conducted in Fiscal Year 2016)

Tamagawa Green Space Park Baseball Field (Measurement Date: December 12, Weather: Clear)

Measurement Location	Measurement Values (Unit: MicroSieverts per hour) 1 Centimeter Above Ground
Behind the A-side back net	0.041
In front of the A-side third base bench	0.046
Behind Second Base A Side	0.033
Area A Sand Storage	0.047
B Side First Base Sand Storage Area	0.033
Behind the second base on the B side	0.043

Tamagawa Green Space Park Softball Field (Measurement Date: December 12, Weather: Clear)

Measurement Location	Measurement Values (Unit: MicroSieverts per hour) 1 Centimeter Above Ground
Behind the A-side back net	0.061
Near the A-side first base bench	0.043
Behind Second Base A Side	0.039
Behind the second base on the B side	0.040
B Side Mound	0.028
Behind the B-side back net	0.038

Tamagawa Green Space Park Multipurpose Square (Measurement Date: December 12, Weather: Clear)

Measurement Location	Measurement Values (Unit: MicroSieverts per hour) 1 Centimeter Above Ground
Sand Storage Area	0.057
Near the downstream goal	0.052
Upstream Goal Area	0.048

Tamagawa Green Space Park Gateball Court (Measurement Date: December 12, Weather: Clear)

Measurement Location	Measurement Values (Unit: MicroSieverts per hour) 1 Centimeter Above Ground
Downstream	0.062
Upstream	0.074

Wakabadai Park Multipurpose Square (Measurement Date: December 13, Weather: Cloudy)

Measurement Location	Measurement Values (Unit: MicroSieverts per hour) 1 Centimeter Above Ground
Left Side Ditch	0.065
Right Side Ditch	0.047

Wakabadai Park Tennis Court (Measurement Date: December 13, Weather: Cloudy)

Measurement Location	Measurement Values (Unit: MicroSieverts per hour) 1 Centimeter Above Ground
Southeast Corner	0.063
Center	0.067
Minami Chuo	0.050

Inagi Nagamine Sports Plaza (Measurement Date: December 13, Weather: Cloudy)

Measurement Location	Measurement Values (Unit: MicroSieverts per hour) 1 Centimeter Above Ground
South Corner of the Soccer Field	0.044
North Corner of the Soccer Field	0.043
Futsal Court Center	0.056
Southeast Corner of Parking Lot	0.042
South Side of the Management Building	0.032
Central Lawn Area	0.031

Friend Hirao Gymnasium (Measurement Date: December 13, Weather: Cloudy)

Measurement Location	Measurement Values (Unit: MicroSieverts per hour) 1 Centimeter Above Ground
Northwest Corner of the Gymnasium	0.051
South Corner of the Gymnasium	0.056
Southeast Corner of the Gymnasium	0.052

Friend Hirao Ground (Measurement Date: December 13, Weather: Cloudy)

Measurement Location	Measurement Values (Unit: MicroSieverts per hour) 1 Centimeter Above Ground
Southeast Corner of the Ground	0.059
Northeast Corner of the Ground	0.044
Ground North Corner	0.050

Minami-Tama Sports Plaza Soccer Field (Measurement Date: December 15, Weather: Cloudy)

Measurement Location	Measurement Values (Unit: MicroSieverts per hour) 1 Centimeter Above Ground
West Tennis Court Side	0.038
Nishikawa Side Corner	0.044
Manhole near the sandpit	0.036

Minami-Tama Sports Plaza Tennis Court (Measurement Date: December 15, Weather: Cloudy)

Measurement Location	Measurement Values (Unit: MicroSieverts per hour) 1 Centimeter Above Ground
Northwest Corner	0.058
Center	0.046

Omaru Park Tennis Court (Measurement Date: December 16, Weather: Clear)

Measurement Location	Measurement Values (Unit: MicroSieverts per hour) 1 Centimeter Above Ground
Northeast Corner	0.074
B Side Entrance	0.066

Shiroyama Park Tennis Court (Measurement Date: December 16, Weather: Clear)

Measurement Location	Measurement Values (Unit: MicroSieverts per hour) 1 Centimeter Above Ground
Southeast Corner	0.072
Northwest Corner	0.067

Inagi Central Park Baseball Field (Measurement Date: December 16, Weather: Clear)

Measurement Location	Measurement Values (Unit: MicroSieverts per hour) 1 Centimeter Above Ground
Near the back net	0.068
Under the Left Pole	0.046

Inagi Central Park Comprehensive Ground (Measurement Date: December 16, Weather: Clear)

Measurement Location	Measurement Values (Unit: MicroSieverts per hour) 1 Centimeter Above Ground
Stand	0.059
Northwest Field Drainage Ditch	0.039
Center	0.037
Southeast Drainage Ditch of the Field	0.036

Inagi Central Park Comprehensive Gymnasium (Measurement Date: December 16, Weather: Clear)

Measurement Location	Measurement Values (Unit: MicroSieverts per hour) 1 Centimeter Above Ground
1st Floor Main Entrance	0.089
Central Courtyard	0.050

North Green Space Park Tennis Court (Measurement Date: December 15, Weather: Cloudy)

Measurement Location	Measurement Values (Unit: MicroSieverts per hour) 1 Centimeter Above Ground
West Side of AB Side	0.066
East Side of AB Side	0.064
CD Side West Road	0.064
EF Side East Road	0.067
EF Side Higashikawa	0.059
DE Side of the Central River	0.062

Omaru Park Multipurpose Square (Measurement Date: December 15, Weather: Cloudy)

Measurement Location	Measurement Values (Unit: MicroSieverts per hour) 1 Centimeter Above Ground
Behind the A-side back net	0.042
East Side of the B-Side Outfield Net Fence	0.046
East Side Net Fence of the Square	0.048

Description

When converted to an annual basis, 0.23 microsieverts per hour amounts to 0.99864 millisieverts, which is below the standard for normal radiation exposure for the general public (less than 1 millisievert per year, excluding natural background radiation) as recommended by the International Commission on Radiological Protection (ICRP). Therefore, this value is used as the city's judgment criterion.
According to the Ministry of the Environment's "Decontamination Guidelines," if the radiation level at 1 meter above the ground is below 0.23 microsieverts per hour, no further action is required. However, our city takes a more cautious approach and makes decisions based on measurement results taken at the closest point to the object (1 centimeter above the ground).

• Local Radiation Measurement Results of Public Facilities in the City

Measurement Overview

Measurer

City Employee

Measuring Equipment

PA-1000

Measurement Method

Average of 5 repeated measurements every 60 seconds

Past Measurement Results

• Sports Facilities (PDF 135.6KB)