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更新日:2017年3月24日

Results on Radiation Measurements at the Ibaraki Prefectural Youth Hall 

Results on Radiation Measurements at the Ibaraki Prefectural Youth Hall (12th Survey)

Results from the measurements of airborne radiation at the Prefectural Youth Hall done by the Prefectural Women and Youth Division are as shown below.

All of the results were below the 1 microsievert per hour at 50cm above the ground guideline given on August 26th by MEXT in regards to airborne radiation in school grounds and gardens.

We are continuing to conduct measurements of the level of airborne radiation at the Prefectural Youth Hall on an average of once a month, and releasing the results on the Prefectural Women and Youth Division website as well as the Prefectural Youth Hall website.

Furthermore, in special situations such as detection of radiation values relatively high compared to the surrounding areas, we will be providing related documentation.

Measurement Days: Monday, August 8th, 2011 (1st), Thursday, September 8th, 2011 (2nd), Wednesday, October 12th, 2011 (3rd), Wednesday, November 9th, 2011 (4th), Thursday, December 8th, 2011, Wednesday, January 11th, 2012, Friday, February 10th, 2012, Thursday, March 8th, 2012, and Friday, June 8th, 2012.

Measurement Device: Sodium Ion Scintillation Survey Meter (Manufactured by the Aloka Corp.)

Measurement Methods: Measuring 5 locations on the grounds (outdoors), and calculating their average value (same for all 4 surveys).

Results (all units are in microsieverts/hour):

1. Grounds (outdoors), average value for 5 locations (50cm above ground)

1st 2nd 3rd 4th 5th 6th 7th 8th 9th 10th 11th 12th
0.157 0.165 0.156 0.160 0.152 0.150 0.147 0.145 0.131 0.124 0.120 0.116

 

2. Locations where high radiation levels were measured (2nd, 1cm above ground) (2nd Survey Only):

Measured locations Before Decontamintaion After Decontamination Percentage of Reduction Decontamination Method
1cm 50cm 1cm 50cm 1cm 50cm
secondary parking lot 1.71 0.26 0.38 0.16 77.7% 38.4% covering with new soil after the old soil was removed (removed an area with a depth of 5cm at roughly 10cmX 1000cm)
below the area wall

 

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