The Examination of Radiological Monitoring on Okayama Prefectural Institute for Environmental Science and Public Health.

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  • KANEMATSU Seiko
    Okayama Prefectural Institute for Environmental Science and Public Health

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  • 岡山県環境保健センターにおける放射能測定への取り組み
  • オカヤマケン カンキョウキョウ ホケン センター ニ オケル ホウシャノウ ソクテイ エ ノ トリクミ

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We evaluated the environment around Ningyotoge in the northern part of Okayama Prefecture. (I) Measurement with TLD. 1) Environmental gamma ray measurement results were evaluated by TLD at the time of confirming an investigation using a continuous gamma ray monitor. Doses during that time span for passing persons and individuals in the area were lower than 89nGy/h. 2) We observed Fading for TLD. The result was that the Fading revision coefficient for the Tenno district in Ningyotoge between October 10, 1997 to December 18, 1997 was 1.02. That for the premises of the Okayama Prefectural Institute for Environmental Science and Public Health was 1.05. The Tenno district in Ningyotoge during the period between June 29, 1998 to October 6, 1998 was 1.04. 3) A relationship between the height from the ground and gamma ray dose was found. A straight line was shown by both logarithm graphs. (II) Wastewater processing. We evaluated radioactive wastewater. When considering the processing of wastewater that flows into rivers, a discharge of zero release is desirable. We evaluated the BOD, COD, etc, as well as the radioactive materials that are processed by microbes such as Bacillus and Arthrobacter.

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