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The measurement situation of radioactive cesium concentration in "recycling plant of forest Park green of Yokohama animal" and space radiation dose

■Radioactive cesium concentration of compost and raw materials

[the measurement situation]

 Measurement item 

 Measurement day 

 Cesium 134 


 The cesium total 

 Compost just before shipment

March 24, 2015




 Tip just before shipment 

March 24, 2015




※ Unit is becquerel /kg

●Method for measurement
 We are based on nuclide analysis by gamma-ray spectrometry using germanium semiconductor detector
 ※Yokohama-shi green business cooperative association which ran green recycling plant asked analysis organization for the measurement and carried out.

●Shipment, sale of product
 We measure at the time of shipment in compost production, and shipment sells after checking being within the temporarily allowable value (product weight 400 becquerels/kg) that country showed.

●Notices from country
 ・About setting of provisional allowable value of manure, soil improvement material, soil containing radioactive cesium and feed

 ・About handling of establishment of "laboratory procedure for the radioactive cesium measurement during earthing up" and the radioactive cesium measurement in soil improvement material    

■Space radiation dose of site border 

[the measurement situation]

 Measurement point

 Measurement height


 North side site border  1m  0.09
 East side site border  1m  0.09
 South side site border  1m  0.08
 Western site border  1m  0.05

※In sievert / microas for 1 unit


●Measurement day 
August 24, 2011

●Measuring equipment
 Sodium iodide scintillation survey meter



In addition, we measure at nursery school, elementary school, junior high school in the city.
  Elementary and junior high school http://translate-en.city.yokohama.lg.jp/kyoiku/hou-sokutei/
  Nursery school http://translate-en.city.yokohama.lg.jp/kodomo/unei/sokutei.html


You can see radiation result of a measurement performing fixed-point observation (environmental science research institute, Tsuzuki Ward   government office, southern part greenery office) at altitude of 50cm and 1m from the surface of the earth in the city from this.



・Inquiry about compost 
Recycling plant of forest Park green of Yokohama animal
Telephone: 045-958-3028 FAX: 045-958-3029
 (business hours: for from Monday to Friday for from 8:00 to 18:00)
  Yokohama-shi green business cooperative association

・Other inquiries 
 City of Yokohama, Environmental Planning Bureau greenery maintenance section
 Telephone: 045-671-3848 FAX: 045-664-2588 
 (reception hours: for from Monday to Friday for from 8:45 to 17:15)

City of Yokohama, Environmental Planning Bureau greenery part greenery maintenance section - September 9, 2011 Making - April 6, 2015 Update
Opinion, inquiry - ks-koeniji@city.yokohama.jp - telephone: 045-671-3848 - FAX: 045-664-2588
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