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Measurement status of radioactive cesium concentration and spatial radiation rate
It is the measurement situation of radioactive cesium concentration and spatial radiation rate in "Yokohama Animal Forest Park Green Recycling Plant".
Last Updated January 18, 2024
Concentration of radioactive cesium in compost and raw materials
Measurementitems | Measurement date | Cesium-134 | Cesium-137 | Cesium total |
|---|---|---|---|---|
Compost immediately before shipment | March 24, 2015 | 2 | 6 | 8 |
Chips just before shipment | March 24, 2015 | 6 | 24 | 30 |
※Units are becquerels/kg
Measurement method
Compliance with nuclide analysis method using γ-ray spectrometry using a germanium semiconductor detector
※The measurement was carried out by the Yokohama Green Business Cooperative, which operates a green recycling plant, requested an analytical organization.
Shipment and sales of products
In compost production, measurements are performed at the time of shipment and shipped and sold after confirming that it is within the provisional allowable value (product weight 400 becquerels / kg) indicated by the government.
Spatial radiation dose at the site boundary
Measurement point | Measurement height | Measured values |
|---|---|---|
| Northern site boundary | １ｍ | 0.09 |
| East site boundary | １ｍ | 0.09 |
| Boundary Site Boundary | １ｍ | 0.08 |
| West site boundary | １ｍ | 0.05 |
※1 unit is microsievert/hour.
Measurement date
August 24, 2011
Measurement equipment
Sodium iodide, scintillation, Survey Meter
Others
On March 29, 2012, the radiation monitoring post (outside site) installed on municipal land in the west of France, Hodogaya Ward, constant measurement of atmospheric γ (gamma) dose at 1m above the ground was started on March 29, 2012.
For inquiries about composting
Green recycling plant
Phone: 045-958-3028
FAX: 045-958-3029
(Business hours: Monday to Friday, 8:30-12:00, 13:00-17:30)
For inquiries to this page
Green Environment Bureau Park Green Space Department Parks and Green Space Preservation Division
Phone: 045-671-3848
Phone: 045-671-3848
Fax: 045-664-2588
Email address: mk-koeniji@city.yokohama.lg.jp
Page ID: 624-594-454
