Local Measurement Results of Ambient Radiation Levels at Inagi Fureai Forest (Updated February 1, 2017)

Measurements of ambient radiation levels were conducted in accordance with the city's policy for measuring ambient radiation levels at Inagi Fureai Forest facilities, 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 (Conducted in Fiscal Year 2016)

Inagi Fureai Forest (Measurement Date: December 19, 2016, Weather: Clear)

Measurement Location	Measurement Values (Unit: microsieverts per hour) 1 centimeter above ground
Next to the parking lot	0.027
Drainage ditch (south side of the old leader's hut)	0.047
Management Shed (West Side)	0.053
Management Shed (Entrance)	0.039
Summit Table	0.053
Cooking Area (Side)	0.039
Gutter (in front of foot washing area)	0.041
Kitchen	0.050
South Outer Route (Under the Stairs)	0.030
Fire Pit	0.034
Fire Area (Stage)	0.026
South Outer Ring Road	0.032
Jujuan	0.032
Minami no Izumi (On the Bridge)	0.033
Minami no Izumi (On the Water)	0.043
Hinokiyasha	0.067
North Outer Ring Road (Sawa)	0.038
North Outer Ring Road	0.023
Tent Site (North)	0.051
Tent Site (West)	0.032
Tent Site (East)	0.022
Tent Site (South)	0.038

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

• Inagi Fureai Forest (PDF 74.6KB)