Journal
SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS
Volume 14, Issue 1, Pages -Publisher
NATL INST MATERIALS SCIENCE
DOI: 10.1088/1468-6996/14/1/015002
Keywords
radiocaesium; caesium cation recognition; optical probe; supramolecular; charge transfer
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Funding
- World Premier International Research Center Initiative (WPI Initiative) on Materials Nanoarchitectonics, from MEXT Japan
- CREST program of the Japan Science and Technology Agency (JST), Japan
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Large amounts of radioactive material were released from the Fukushima Daiichi nuclear plant in Japan, contaminating the local environment. During the early stages of such nuclear accidents, iodine I-131 (half-life 8.02 d) is usually detectable in the surrounding atmosphere and bodies of water. On the other hand, in the long-term, soil and water contamination by Cs-137, which has a half-life of 30.17 years, is a serious problem. In Japan, the government is planning and carrying out radioactive decontamination operations not only with public agencies but also non-governmental organizations, making radiation measurements within Japan. If caesium (also radiocaesium) could be detected by the naked eye then its environmental remediation would be facilitated. Supramolecular material approaches, such as host-guest chemistry, are useful in the design of high-resolution molecular sensors and can be used to convert molecular-recognition processes into optical signals. In this work, we have developed molecular materials (here, phenols) as an optical probe for caesium cation-containing particles with implementation based on simple spray-on reagents and a commonly available fluorescent lamp for naked-eye detection in the solid state. This chemical optical probe provides a higher spatial resolution than existing radioscopes and gamma-ray cameras.
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