- 著者
- Masahiro Hirota Shogo Higaki Takumi Higaki Seiichiro Hasezawa
- 出版者
- 日本放射線安全管理学会
- 雑誌
- Radiation Safety Management (ISSN:13471511)
- 巻号頁・発行日
- vol.12, no.2, pp.43-47, 2013 (Released:2013-12-19)
- 参考文献数
- 10
- 被引用文献数
- 2
The contamination of spinach collected immediately following the Fukushima Daiichi nuclear disaster was investigated. The radionuclides deposited in the spinach were 132Te, 131I, 132I, 134Cs, 136Cs and 137Cs. Only 40% of these radionuclides were removed when the spinach was washed with water or detergent. The two outside leaves of each spinach stump were contaminated with the radionuclides, but the three inside leaves were nearly uncontaminated. The most significant contamination was observed on the concavities, creases, veins and leaf or stem injuries of the spinach. Most of the radionuclides deposited on the surface, leading to a radioactivity concentration of the epidermal tissue 9 times that of the mesophyll tissue.
- 著者
- Kazuhiro Shiba Yoji Kitamura Takashi Kozaka Izumi Uno Kikuo Shimizu Masahiro Hirota Shogo Higaki Kazuyoshi Masumoto
- 出版者
- 日本放射線安全管理学会
- 雑誌
- Radiation Safety Management (ISSN:13471511)
- 巻号頁・発行日
- vol.11, no.1, pp.19-22, 2012 (Released:2012-12-21)
- 参考文献数
- 5
- 被引用文献数
- 1
We examined the characteristics of the radioactive contamination and the physical removal of radioactivity from contaminated cabbage and spinach. In a distribution imaging study, there were two types of contamination, spot type and spread type, of cabbage and spinach. The relative radioactivity (PSL) of the face of the leaf was much higher than that of the back of a leaf of cabbage. The ratio of relative radioactivity (PSL) between spot contamination and spread contamination in a leaf of spinach was 9.4% and 90.6%, respectively. More than 80% of radioactivity attaches to the surface of leaves of spinach. There was no significant difference of radioactivity removal between hand-washing and rinsing with running water. The degree of removal of radioactivity from contaminated spinach depended on the length of time between contamination and rinsing. When contaminated spinach was rinsed within 1 week after contamination, the removal ratio of 131I and 137Cs was high, with 50% and 70%, respectively. When rinsing contaminated spinaches more than 2 weeks after contamination, the removal ratio of 131I and 137Cs was low, approximately 34% and 69%, respectively.