EPR measurement of environmental radiation using human fingernails
-
Abbas Noori
and
M. Mostajab
Abstract
In this research work, human fingernails were utilized to estimate the radiation dose using EPR measurements of radiation-induced radicals. The limiting factors in this research were the presence of mechanical induced EPR signals due to the mechanical stress during the preparation of the samples. The mechanically induced signals overlap with the radiation-induced signal, which considerably can overestimate the dose. Thus, different treatment methods of fingernails were used to reduce the mechanical induced signals. The results demonstrate that the mechanical and radiation induced signals have apparently different microwave power saturation behavior. Also, mechanical induced signal shows a fading evolution vs. time and reaches to a constant value. Chemical treatment using the different reagents showed that the minimum mechanical induced signal was obtained using the dithiothreitol reagent. The dose response curves of the treated samples with dithiothreitol for 30 min demonstrated a more linearity, and closer curves in comparison to those treated in 5 min. Therefore, to find out an unknown absorbed dose in a fingernail sample using a calibration curve, it could be recommended to use the mentioned chemical treatment procedure to reduce the uncertainty.
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Articles in the same Issue
- Frontmatter
- Development of a “fission-proxy” method for the measurement of 14-MeV neutron fission yields
- Investigations on the complete removal of iron(III) interference on the uranium(VI) extraction from sulfate leach liquor using Alamine 336 in kerosene
- Homogeneous hydrolysis of thorium by thermal decomposition of urea
- Solubilities and solubility products of thorium hydroxide under moderate temperature conditions
- Determination of uranium and thorium concentrations in thorium ore sample using artificial neural network and comparison with net area peak method
- Solvent extraction separation of zirconium and hafnium from nitric acid solutions using mixture of Cyanex-272 and TBP
- Development of granular radioactive reference source from 152,154Eu adsorbed on tin tungstate matrix
- Dosimetric characterization of novel polycarbonate/porphyrin film dosimeters for high dose dosimetry: study on complexation effect
- EPR measurement of environmental radiation using human fingernails
