AI Article Synopsis
- The Fukushima nuclear accident led to the release of radioactive materials, which caused black spots on medical images taken with phosphor plates.
- This study aimed to measure the radioactivity levels of contaminated imaging plates by applying known quantities of contaminants to filter paper and determining their effects over various irradiation times.
- Results indicated that the black spots were primarily caused by radioisotopes directly adhering to the imaging plates, with evaluated activities aligning closely with known decontamination values.
Article Abstract
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 ((134)Cs and/or (137)Cs) in the form of liquid was dropped on filter paper (25 mm(2)), 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.
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| http://dx.doi.org/10.6009/jjrt.2012_jsrt_68.11.1467 | DOI Listing |
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