Local radiation measurement results for the Central Library and SHIROYAMA EXPERIENCE STUDY INSTITUE (Updated August 15, 2016)

We have conducted measurements of ambient radiation levels in accordance with the policy for measuring ambient radiation levels in the city at the Central Library and SHIROYAMA EXPERIENCE STUDY INSTITUE, and we will publish the results.
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 (Conducted in Fiscal Year 2016)

Central Library SHIROYAMA EXPERIENCE STUDY INSTITUE (Measurement Date: June 29, 2016, Weather: Cloudy)

Measurement Location	Measurement Values (Unit: microsieverts per hour) 1 centimeter above ground
Main Entrance	0.054
Bicycle Parking Lot Front	0.054
Pond	0.050
Field	0.055
Square	0.083

Description

When converted annually, 0.23 microsieverts per hour amounts to 0.99864 millisieverts, which is below the standard value for radiation exposure for the general public during normal times (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 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 Employee

Measuring Equipment

PA-1000

Measurement Method

Average of 5 repeated measurements every 60 seconds

Past Measurement Results

• Central Library・SHIROYAMA EXPERIENCE STUDY INSTITUTE (PDF 47.0KB)