Local Radiation Measurement Results for the Complex Facility Friend Hirao (Updated January 1, 2017)

Measurements of ambient radiation levels were conducted in the Hirao Friend Complex facility 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)

Complex Facility Friend Hirao (Measurement Date: September 27, 2016, Weather: Clear)

Measurement Location	Measurement Value (Unit: microsieverts per hour) 1 centimeter above ground surface
East Entrance in Front of the Regular Classroom Building	0.060
Gym Entrance	0.058
West Entrance in Front of the Regular Classroom Building	0.061
Sports Field Entrance	0.062
South of the Sports Ground	0.062
West of the Sports Ground	0.066
North of the Sports Ground	0.045
Infirmary Special Classroom Building Front	0.061
In front of the gym storage	0.059

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

• Hirao Friendship Complex (PDF 59.2KB)