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ID 113653
Title Alternative
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
Author
Hayashi, Hiroaki The University of Tokushima KAKEN Search Researchers
Nishihara, Sadamitsu The University of Tokushima KAKEN Search Researchers
Takashi, Satoru Tokushima University
Hanamitsu, Hiroki The University of Tokushima
Mori, Michiko The University of Tokushima
Onuma, Yoji Kashima Rosai Hospital
Keywords
imaging plate
black spots
radioisotopes
Content Type
Journal Article
Description
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.
Journal Title
Japanese Journal of Radiological Technology
ISSN
03694305
18814883
NCID
AN00197784
Publisher
日本放射線技術学会
Volume
68
Issue
11
Start Page
1467
End Page
1473
Published Date
2012-11-20
EDB ID
DOI (Published Version)
URL ( Publisher's Version )
FullText File
language
jpn
TextVersion
Publisher
departments
Medical Sciences
Advance Radiation Research, Education, and Management Center