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ID 113653
タイトル別表記
Estimation of Activities Caused by Black Spots for Digital Radiography System : Analysis of Black Spots by the Low Concentrate Radioisotopes Adhered Directly to the Surface of the Phosphor Plate
著者
高志, 智 徳島大学
花光, 宏樹 徳島大学
森, 美智子 徳島大学
小沼, 洋治 鹿島労災病院
キーワード
imaging plate
black spots
radioisotopes
資料タイプ
学術雑誌論文
抄録
Because of an accident of the nuclear power plants in the Fukushima, many radioisotopes (RI) have been diffused to the environment. As a result, black spots were appearing on the medical images which were taken by the phosphor plate. The aim of this study is to evaluate the activity (Bq) of radioactive contaminated IP based on the experiment using RI. The radioactive material (134Cs and/or 137Cs) in the form of liquid was dropped on filter paper (25 mm2), and radioactive sources having 40–240 Bq activities were made. These sources were closely attached to the IP with irradiation times of 2–22 h. Then, we obtained the relationship between pixel values and products of activities and irradiation times. Using these relationships, we evaluated the activity in the contaminated IP. The evaluated value of approximately 7 Bq was in good agreement with a value which was inhered in a chemical wiper used for the decontamination of the IP. Based on the results, we summarized that almost all black spots were created by the RI adhered directly to the IP.
掲載誌名
日本放射線技術学会雑誌
ISSN
03694305
18814883
cat書誌ID
AN00197784
出版者
日本放射線技術学会
68
11
開始ページ
1467
終了ページ
1473
発行日
2012-11-20
EDB ID
出版社版DOI
出版社版URL
フルテキストファイル
言語
jpn
著者版フラグ
出版社版
部局
医学系
放射線総合センター