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Measurement status of radioactive cesium concentration and spatial radiation rate
This is the measurement status of radioactive cesium concentration and spatial radiation rate at "Yokohama Animal Forest Park Green Recycling Plant".
Last Updated January 18, 2024
Radioactive cesium concentration in compost and raw materials
Measurementitems | Date of measurement | Cesium-134 | Cesium-137 | Total Cesium |
|---|---|---|---|---|
Compost just before shipment | March 24, 2015 | 2 | 6 | 8 |
Tips immediately before shipment | March 24, 2015 | 6 | 24 | 30 |
※Units are becquerels/kg
Measurement method
Compliant with nuclides analysis using gamma-ray spectrometry using germanium semiconductor detectors
※The measurement was carried out by the Yokohama Green Business Cooperative, which operates a green recycling plant, asking an analytical organization.
Shipment and sale of products
In compost production, we measure at the time of shipment and confirm that it is within the provisional allowance set by the government (product weight of 400 becquerels / kg) before shipping and selling.
Space radiation dose at site boundaries
Measurement point | Measurement height | Measurement value |
|---|---|---|
| North site boundary | １ｍ | 0.09 |
| East site boundary | １ｍ | 0.09 |
| South site boundary | １ｍ | 0.08 |
| West site boundary | １ｍ | 0.05 |
※1 unit is microsievert/hour
Date of measurement
August 24, 2011
Measurement equipment
Sodium iodide, scintillation, survey meter
Others
On March 29, 2012, we started regular measurement of γ (gamma) doses in the atmosphere at 1 m above ground at radiation monitoring posts (outside site) installed on municipal land inHodogaya Ward Buddha.
For inquiries about compost
Green Recycling Plant
Telephone: 045-958-3028
FAX: 045-958-3029
(Business hours: Monday to Friday, 8:30 to 12:00, 13:00 to 17:30)
Inquiries to this page
Green Environment Bureau Park Green Area Parks and Green Space Preservation Division
Telephone: 045-671-3848
Telephone: 045-671-3848
Fax: 045-664-2588
Email address: mk-koeniji@city.yokohama.lg.jp
Page ID: 624-594-454
