Local Measurement Results of Ambient Radiation Levels at City Hall (Updated November 1, 2016)

Measurements of ambient radiation levels were conducted on the City Hall premises in accordance with the city's ambient radiation measurement policy, 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)

Inagi City Hall (Measurement Date: October 7, 2016, Weather: Clear)

Measurement Location	Measurement Value (Unit: microsieverts per hour) 1 centimeter above ground surface
West Entrance Front Planting	0.068
East Side Entrance Rainwater Drain	0.073
West Side Parking Lot Rainwater Drain	0.055
Garage Building Rainwater Drain	0.072
North Side Parking Lot Drain	0.089
Underground Slope Lower Drain	0.081
Second Parking Lot	0.079
Parking Lot 3	0.078
Parking Lot 4	0.059
Parking Lot No. 5	0.067

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

• City Hall (PDF 58.8KB)