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Radioactive cesium concentration and the measurement situation of quantity of space radiation rate

It is radioactive cesium concentration in "recycling plant of forest Park green of Yokohama animal" and the measurement situation of quantity of space radiation rate.

Last update date February 21, 2019

Radioactive cesium concentration of compost and raw materials

The measurement situation

The measurement item

The 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 (the outside site) asked analysis organization for the measurement and carried out.

Shipment, sale of product

We measure at the time of shipment in the 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, the soil improvement material, soil containing radioactive cesium and feed (the outside site)

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

Space radiation dose of site border

The measurement situation

The measurement point

The measurement height


The north side site border1m0.09
The east side site border1m0.09
The south side site border1m0.08
Western site border1m0.05

※In sievert/microas for 1 unit

The measurement day

August 24, 2011

Measuring equipment

Sodium iodide, scintillation, survey meter


In the radiation monitoring post which we installed in west municipal ownership place for Hodogaya Ward France, we started the regular measurement of atmospheric γ (gamma) dose of radioactivity in 1m above the ground point on March 29, 2012.

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 8:00-18:00)

Inquiry to this page

Environmental Planning Bureau greenery part greenery maintenance section

Telephone: 045-671-2650

Telephone: 045-671-2650

Fax: 045-664-2588

E-Mail address [email protected]

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