Local Measurement Results of Ambient Radiation Levels at Hirao Branch Office (Updated August 15, 2016)

At the Hirao Branch Office, we conducted measurements of ambient radiation levels based on the policy for measuring ambient radiation levels in the city. We will now publish the results.
Furthermore, in this measurement, there were no areas that required cleaning or other actions (areas exceeding the judgment criterion of 0.23 microsieverts per hour).
Note: For the Wakabadai Branch Office, please refer to the "Local Measurement Results of Ambient Radiation Levels at the Cultural Center" (i Plaza).

• Local Measurement Results of Ambient Radiation Levels at the Cultural Center (Updated April 1, 2017)

Measurement Results (Conducted in Fiscal Year 2016)

Hirao Branch Office (Measurement Date: July 5, 2016, Weather: Cloudy)

Measurement Location	Measurement Values (Unit: MicroSieverts per hour) 1 Centimeter Above Ground
East Side of the Downspout	0.067
West Side Downspout	0.083
Under the bulletin board	0.092

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

• Hirao Branch Office (PDF 43.0KB)