Local Measurement Results of Space Radiation Levels at the Children's Center and After-School Childcare Program (Updated February 1, 2017)

Measurements of ambient radiation levels were conducted in the Children's Center and After-School Childcare Program facilities based on the city's policy for measuring ambient radiation levels, and the results are hereby announced.
In this measurement, there were no areas that require cleaning, as there were no locations exceeding the judgment criterion value (0.23 microsieverts per hour).

Measurement Results (FY2016)

Third Children's Center (Measurement Date: November 17, Weather: Clear)

Measurement Location	Measurement Value (Unit: microsieverts per hour) 1 centimeter above ground surface
North Side of the Sandbox	0.051
East Side of the Children's Center Front Drain	0.053
Children's Center Front Drainage Pit Inner Side	0.051
West Side of the Children's Center Front Drain	0.047
Sandbox Inner Side	0.039
Entrance Front	0.056

Hirao Elementary School After-School Childcare Program (Measurement Date: November 15, Weather: Cloudy)

Measurement Location	Measurement Value (Unit: microsieverts per hour) 1 centimeter above ground surface
East Side Drain	0.068
North Side Drainage Pit	0.062

Wakabadai Elementary School After-School Childcare Program (Measurement Date: November 7, Weather: Clear)

Measurement Location	Measurement Value (Unit: microsieverts per hour) 1 centimeter above ground surface
North Side Drainage Pit	0.077

Fourth Children's Center and Fourth Cultural Center After-School Childcare Program (Measurement Date: November 2, Weather: Cloudy)

Measurement Location	Measurement Value (Unit: microsieverts per hour) 1 centimeter above ground surface
Cultural Center (Children's Center) Front Entrance	0.090
South side of the Cultural Center (After-school Path)	0.157
South Side of the Children's Playground	0.083
After-school playground southwest side	0.071

After-School Childcare Program at Daini Elementary School (Measurement Date: November 2, Weather: Cloudy)

Measurement Location	Measurement Value (Unit: microsieverts per hour) 1 centimeter above ground surface
Children's Entrance	0.069

After-School Childcare Program at Sixth Elementary School (Measurement Date: November 2, Weather: Clear)

Measurement Location	Measurement Value (Unit: microsieverts per hour) 1 centimeter above ground surface
Southeast Entrance in Front of the After-School Care	0.076

Shiroyama Children's Center (Measurement Date: November 4, Weather: Clear)

Measurement Location	Measurement Value (Unit: microsieverts per hour) 1 centimeter above ground surface
Drainage ditch in front of the entrance	0.070
Rainwater Drainage Pit Next to the Building	0.078

Shiroyama Elementary School After-School Childcare Program (Measurement Date: November 4, Weather: Clear)

Measurement Location	Measurement Value (Unit: microsieverts per hour) 1 centimeter above ground surface
Drainage ditch in front of the entrance	0.066

Koyodai Elementary School After-School Childcare Program (Measurement Date: November 4, Weather: Clear)

Measurement Location	Measurement Value (Unit: microsieverts per hour) 1 centimeter above ground surface
In front of the entrance	0.079
Near the Water Supply	0.064
Front Entrance Plant Base	0.061

Nagamine Elementary School After-School Childcare Program (Measurement Date: November 4, Weather: Clear)

Measurement Location	Measurement Value (Unit: microsieverts per hour) 1 centimeter above ground surface
In front of the entrance	0.073
Near the Water Supply	0.074
Backyard Downspout	0.058

Second Children's Center / Second Cultural Center After-School Childcare Program (Private) (Measurement Date: November 30, Weather: Clear)

Measurement Location	Measurement Value (Unit: microsieverts per hour) 1 centimeter above ground surface
Courtyard (South Side)	0.080
Gutter (Near the eastern boundary)	0.063
Handwashing Station (In front of the East Side After-School Childcare Program Entrance)	0.067

After-School Childcare Program Yanokuchi Children's Club (Private) (Measurement Date: November 30, Weather: Clear)

Measurement Location	Measurement Value (Unit: microsieverts per hour) 1 centimeter above ground surface
In front of the entrance	0.102
West Side of the Facility	0.086
South side of the facility	0.091

After-School Childcare Program Children's Forest (Private) (Measurement Date: November 30, Weather: Clear)

Measurement Location	Measurement Value (Unit: microsieverts per hour) 1 centimeter above ground surface
Entrance (Rain Gutter)	0.077
West side of the facility (rain gutter)	0.052
West Lawn	0.036

Daiichi Elementary School After-School Childcare Program (Private) (Measurement Date: November 30, Weather: Clear)

Measurement Location	Measurement Value (Unit: microsieverts per hour) 1 centimeter above ground surface
Entrance (Water Supply)	0.082
Slope Drain Next to Entrance	0.074
West Side of the Facility	0.073

Hongo Children's Center and Hongo After-School Childcare Program (Private) (Measurement Date: November 30, Weather: Clear)

Measurement Location	Measurement Value (Unit: microsieverts per hour) 1 centimeter above ground surface
Rooftop (South Side Drain)	0.074
Entrance (Flower Bed)	0.074
West Side of the Facility	0.079

Minamiyama Elementary School After-School Childcare Program (Private) (Measurement Date: November 30, Weather: Clear)

Measurement Location	Measurement Value (Unit: microsieverts per hour) 1 centimeter above ground surface
Front Entrance (Water Supply)	0.098
South side of the facility (drainage ditch)	0.057
North side of the facility (in front of the flower bed)	0.058

Note: The After-School Childcare Program at Inagi Dai 2 Elementary School shares entrances and exits with Inagi Dai 2 Elementary School, so please refer to the "Local Measurement Results of Ambient Radiation Levels at Municipal Elementary and Junior High Schools."

• Results of Local Measurements of Ambient Radiation Levels at Municipal Elementary and Junior High Schools (Updated October 19, 2020)

Description

When converted to an annual dose, 0.23 microsieverts per hour corresponds to 0.99864 millisieverts per year, which is below the reference level for radiation exposure to the general public under normal conditions recommended by the International Commission on Radiological Protection (ICRP) (1 millisievert per year or less, excluding natural radiation). Therefore, this value is used as the city's decision criterion.
According to the Ministry of the Environment's "Decontamination Guidelines," if the radiation level at a depth of 1 meter below the surface 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 below the surface).

• Local Radiation Measurement Results of Public Facilities in the City

Measurement Overview

Measurer

City Staff

Measuring Equipment

PA-1000

Measurement Method

Average of 5 repeated measurements every 60 seconds

Past Measurement Results

• Children's Center・After-School Childcare Program (PDF 115.1KB)