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The radioactivity concentration measurement of humus, pruning branch compost and organic quality soil improvement material raw materials

 

We perform the radioactivity concentration measurement about fallen leaves that are raw materials of humus, pruning branch compost and organic quality soil improvement material, pruning branch. 

 

●Result of a measurement

We measured about fallen leaves that we gathered at farmland in the city and the outskirts and pruning branch.

Collection dayMeasurement itemCesium 134 (Bq/kg)Cesium-137 (Bq/kg)The cesium total (Bq/kg)
December 17, 2013 Fallen leaves Less than detection limit 20 20
December 18, 2013 Pruning branch Less than detection limit  Less than detection limit  Detection limit is less than cesium 134 .137 together
December 18, 2013 Pruning branch Less than detection limit 10 10
December 18, 2013 Fallen leaves Less than detection limit 20 20
December 24, 2013 Pruning branch Less than detection limit Less than detection limit Detection limit is less than cesium 134 .137 together
January 8, 2014 Fallen leaves  Less than detection limit Less than detection limit Detection limit is less than cesium 134 .137 together

※ Provisional allowable value of radioactive cesium of manure, soil improvement material, *dochu becomes 400Bq/kg (product weight).
  (reference: manure, soil improvement material, *do containing radioactive cesium and feed temporarily about setting of permission level on (August 1, 2011))
※ "Less than detection limit" are less than fixed-quantity lower limit
※ Based on laboratory procedure of country, we measured cesium 134, total quantity of each 137 fixed-quantity lower limit level as less than 50 Bq/kg.


●About measuring instrument

We measured with the following measuring instruments in environmental science research institute.
SEIKO EG&G GEM25-70 (germanium semiconductor detector)



●About laboratory procedure


Of country inspected for "handling of establishment of "laboratory procedure for the radioactive cesium measurement of *dochu" and the radioactive cesium measurement in soil improvement material according to" (August 31, 2011).


●About the handling of humus, pruning branch compost and organic quality soil improvement material


 As notice is started to restrain itself from production, shipment of humus, pruning branch compost in 17 capital prefectures including Kanagawa and organic quality soil improvement material and application from world on August 30 on August 5, 2011, it follows, and I would like self-restraint.
 In addition, application, the use is possible about tentativeness permission level cases less than with thing which company (person producing for the purpose of sale, transfer) produces when we perform reduction application of all or a part of the farm products produced by farmland on the farmland concerned and.
 In addition, country is considering whether farming families restart production, shipment of humus, pruning branch compost and organic quality soil improvement material and application now.
City of Yokohama, Environmental Planning Bureau green up promotion part agriculture promotion section - February 6, 2014 Making - February 06, 2014 Update
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