報告書番号

283071

タイトル（和文）

石炭灰捨場における大気中浮遊粉じんの天然放射能濃度

タイトル（英文）

NATURAL RADIOACTIVITY OF AIRBORNE PARTICULATES IN COAL-ASH DISPOSAL SITE

概要 （図表や脚注は「報告書全文」に掲載しております）

本報告は石炭火力発電所の灰捨場における大気中浮遊粉じんの天然放射能について，実態調査を行い，検討したものである。主な結果は次の通りである。１．灰捨場と対照地点の粉じん中のＵ，Ｔｈ，Ｐｏ濃度は，ほぼ等しかった。２．灰捨場の粉じん中のＵ，Ｔｈ，Ｐｏの発生源を，粉じん中のＳｃ，Ｃｌ，との相関から推定することができた。３．灰捨場の粉じん中のＵ，Ｔｈ，Ｐｏは土壌起原が約８０％，自転車排ガスが主とみられる人的汚染が約２０％であり，Ｔｈは約１００％が土壌起原と推定された。以上の結果，灰捨場の粉じん中の天然放射能は，周辺地域と違いはみられなかった。

概要 （英文）

AN INVESTIGATION WAS MADE ON THE ACTUAL CONCENTRATIONS OF U,TH AND PO IN AIR-BORNE DUST AND SOIL AROUND COAL POWER STATIONS,TO STUDY THE EFFECT OF COAL-ASH DISPOSAL SITE ON NATURAL RADIOACTIVITY OF ENVIRONMENTAL SAMPLES.SAMPLES WERE COLLECTED AT A COAL-ASH DISPOSAL AND ITS REFERENCE PLACES. THE RESULTS OBTAINED ARE SUMMARIED AS FOLLOWS; (1) CONCENTRATIONS OF U,TH AND PO IN AIR-BORNE DUST AT THE DISPOSAL PLACE WAS NEARLY EQUAL TO THOSE AT THE REFERENCE PLACE. (2) ORIGIN OF THOSE ALPHA-EMITTING ELEMENTS IN THE DUST WAS SUCCESSFULLY DEDUCED,ON THE BASIS OF CORRELATING CONCENTRATIONS OF SC AND CL ELEMENTS IN THE DUST. (3) IT WAS INFERRED THAT ELEMENTS OF BOTH U AND PO IN THE DUST AT DISPOSAL SITE CAME FROM SOIL BY ABOUT 80% AND ARTIFICIAL ORIGIN SUCH AS EXHAUSTED GAS BY REMAINDER.ALMOST ALL TH ELEMENT WERE FROM SOIL. IT WAS THEREFORE CONCLUDED THAT EFFECT OF DISPOSAL SITE ON RADIOACTIVTYCOCENTRATIONS OF DUSTS WAS NEGLIGIBLE.

報告者

キーワード