Thermally Controllable Decolorization of Reusable Radiochromic Complex of Polyvinyl Alcohol, Iodine and Silica Nanoparticles (PAISiN) Irradiated with γ-rays
Open Access
- 14 March 2022
- journal article
- research article
- Published by MDPI AG in Applied Sciences
- Vol. 12 (6), 2959
- https://doi.org/10.3390/app12062959
Abstract
Some medical and industry workers using ionizing radiation sources have potential risks of accidental high-dose exposure of their extremities, particularly their hands. While practical dosimeters suitable for on-site real-time monitoring of hand exposure are not yet available, they are desirable to be developed. Thus, the authors focused on the application of a reusable radiochromic complex composed of polyvinyl alcohol, iodide and silica nanoparticles, named “PAISiN”, and examined their dose responses and thermal stabilities of radiochromic reactions. Three PAISiN samples each were irradiated with 5, 10 and 20 Gy of 137Cs γ-rays, and time changes of the radiation-induced colors were observed at different temperatures: 20 °C (in a laboratory), 40 °C (in an oven) and 5.5 °C (in a refrigerator). It was confirmed that the PAISiN samples presented a red color that was easily detectable by the naked eyesight immediately after irradiation. The coloration was cleared within 24 h for 5 Gy irradiation at room temperature. The decolorization process was remarkably accelerated at 40 °C; it was erased in just 2 h. In contrast, storing in the refrigerator (5.5 °C) kept the color persistently for at least 4 days. These findings indicate that we could flexibly control the decolorization process of PAISiN in accordance with the objective of radiation monitoring.Funding Information
- Japan Society for the Promotion of Science (18KK0147)
This publication has 37 references indexed in Scilit:
- Radio-physical properties of micelle leucodye 3D integrating gel dosimetersPhysics in Medicine & Biology, 2011
- Polymer gel dosimetryPhysics in Medicine & Biology, 2010
- EditorialAnnals of the ICRP, 2007
- Review of Fricke gel dosimetersJournal of Physics: Conference Series, 2004
- Polyvinyl Alcohol as a Useful Indicator on Iodometry: Volumetric and Spectrophotometric Studies on Iodine-PVA and Iodine-Starch ComplexesAnalytical Sciences, 2001
- Tissue-equivalent gel for non-invasive spatial radiation dose measurementsNuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 2000
- Capture of Charge Carriers at the Silica Nanoparticle−Water InterfaceThe Journal of Physical Chemistry B, 1999
- Charge Carrier Transfer across the Silica Nanoparticle/Water InterfaceThe Journal of Physical Chemistry B, 1998
- Imaging of radiation dose by visible color development in ferrous‐agarose‐xylenol orange gelsMedical Physics, 1991
- Critical Review of rate constants for reactions of hydrated electrons, hydrogen atoms and hydroxyl radicals (⋅OH/⋅O− in Aqueous SolutionJournal of Physical and Chemical Reference Data, 1988