Preliminary Study on Electron Spin Resonance Dosimetry Using Affected Cattle Teeth Due to the Fukushima Daiichi Nuclear Power Plant Accident

Inoue, Kazuhiko; Yamaguchi, Iwao; Natsuhori, Masahiro

doi:10.1007/978-981-13-8218-5_13

Cited by 4 publications

(4 citation statements)

References 24 publications

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“…The estimated dose using L-band EPR tooth dosimetry was 0.9-3.9 Gy for the cattle in Namie, which was significantly different from the values in the tooth from Okuma [17]. This range was larger than the monitored cumulative radiation doses over a six-year period beginning in March 2011 in Namie and Okuma, which were estimated to be about 1 Gy and 0.16 Gy, respectively.…”

Section: Comparison Of Estimated Radiation Dosesmentioning

confidence: 66%

L-Band Electron Paramagnetic Resonance Tooth Dosimetry Applied to Affected Cattle Teeth in Fukushima

et al. 2021

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We applied a non-destructive tooth dosimetry technique using L-band electron paramagnetic resonance (EPR) to assess radiation doses in cattle due to the Fukushima Daiichi Nuclear Power Station (FDNPS) accident, which occurred 10 years ago. The radiation exposure of cattle in the area affected by the FDNPS accident was estimated retrospectively with X-band and L-band EPR devices. Characteristic radiation-induced EPR signals were obtained from the teeth of the cattle in Fukushima, confirming their exposure. The estimated doses to the teeth were found to be consistent with the dose trends estimated for individual cows, while considerable uncertainties were seen in the doses of some tooth samples. This variation might be due to errors in the accuracy of the method but also might reflect the actual exposure because the cattle may have been exposed to higher areas of radioactivity in their quest for food and/or due to irradiation from absorption of the isotopes with localization in or near the teeth. However, at a minimum, these results confirm that L-band EPR can be used for non-destructive qualitative assessment of radiation exposure to animals using their teeth, which could be very valuable. Possible causes of the uncertainties should be investigated to enhance the value of the use of this technique.

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Section: Comparison Of Estimated Radiation Dosesmentioning

confidence: 66%

L-Band Electron Paramagnetic Resonance Tooth Dosimetry Applied to Affected Cattle Teeth in Fukushima

et al. 2021

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“…Ionizing radiation-induced paramagnetic defects in calcified tissues like tooth enamel have been employed as dose indicators in electron paramagnetic resonance (EPR) dosimetry. − EPR dosimetry is utilized for radiation dose reconstruction, ,, food irradiation, , nuclear medicine, and archaeological dating. ,,, Because of its high sensitivity and accuracy, EPR dosimetry of tooth enamel has also been successfully employed in retrospective studies of several accidents involving radioactivity, e.g., Hiroshima and Nagasaki, , Chernobyl, − Urals, Maryland, and Fukushima, to determine the radiation dose absorbed by individuals. In retrospective EPR dosimetry, the concentration of radiation-induced stable radicals in tooth enamel is linearly proportional to the absorbed dose received over the radiation range of 10 mGy to 100 Gy, which is pertinent to radiation accident doses. , The calcified tissues acquire their paramagnetic properties due to the existence of a high concentration of hydroxyapatite (HA), ,,, which can incorporate a variety of anions (e.g., CO 3 2– , F – , Cl – , SiO 4 4– ) and cations (e.g., Mn 2+ , Li + , Cu 2+ , Fe 3+ , Mg 2+ , Na + ) in its structure. − Exposing these tissues to ionizing radiation results in the formation of stable CO 2 •– free radicals, originating from CO 3 2– in the lattice, that are responsible for the predominant EPR signal observed post-irradiation.…”

Section: Introductionmentioning

confidence: 99%

“…1−11 EPR dosimetry is utilized for radiation dose reconstruction, 1,2,12 food irradiation, 13,14 nuclear medicine, 15 and archaeological dating. 1,4,16,17 Because of its high sensitivity and accuracy, EPR dosimetry of tooth enamel has also been successfully employed in retrospective studies of several accidents involving radioactivity, e.g., Hiroshima and Nagasaki, 18,19 Chernobyl, 20−22 Urals, 23 Maryland, 24 and Fukushima, 25 to determine the radiation dose absorbed by individuals. In retrospective EPR dosimetry, the concentration of radiationinduced stable radicals in tooth enamel is linearly proportional to the absorbed dose received over the radiation range of 10 mGy to 100 Gy, which is pertinent to radiation accident doses.…”

Section: Introductionmentioning

confidence: 99%

Electron Paramagnetic Resonance Characterization of Sodium- and Carbonate-Containing Hydroxyapatite Cement

et al. 2022

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Ionizing radiation-induced paramagnetic defects in calcified tissues like tooth enamel are indicators of irradiation dose. Hydroxyapatite (HA), the principal constituent in these materials, incorporates a variety of anions (CO 3 2− , F − , Cl − , and SiO 4 4−) and cations (Mn 2+ , Li + , Cu 2+ , Fe 3+ , Mg 2+ , and Na + ) that directly or indirectly contribute to the formation of stable paramagnetic centers upon irradiation. Here, we used an underexploited synthesis method based on the ambient temperature setting reaction of a self-hardening calcium phosphate cement (CPC) to create carbonate-containing hydroxyapatite (CHA) and investigate its paramagnetic properties following γ-irradiation. Powder X-ray diffraction and IR spectroscopic characterization of the hardened CHA samples indicate the formation of pure B-type CHA cement. CHA samples exposed to γ-radiation doses ranging from 1 Gy to 150 kGy exhibited an electron paramagnetic resonance (EPR) signal from an orthorhombic CO 2•− free radical. At γ-radiation doses from 30 to 150 kGy, a second signal emerged that is assigned to the CO 3•− free radical. We observed that the formation of this second species is dose-dependent, which provided a means to extend the useful dynamic range of irradiated CHA to doses >30 kGy. These results indicate that CHA synthesized via a CPC cement is a promising substrate for EPR-based dosimetry. Further studies on the CHA cement are underway to determine the suitability of these materials for a range of biological and industrial dosimetry applications.

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“…However, registration and monitoring of the occupational exposure to the staff dealing with ionizing radiation is another important issue. Due to this dosimetry and related materials, instruments and methods have become a prominent research field in physics and chemistry as it involves different radiation-induced processes and phenomena in irradiated materials: thermoluminescence (TLD) [1][2][3], optically stimulated luminescence (OSL) [3][4][5][6], electron spin resonance (ESR) [7,8], radioluminescence (RL) [9], and others. Dosimetry methods utilizing the above-mentioned phenomena are well established, when speaking about high-energy and high-dose irradiation; however, dose registration in the interval 0-0.1 Gy might be challenging.…”

Section: Introductionmentioning

confidence: 99%

Development and Characterization of Silver Containing Free Standing Polymer FILMS for Dosimetry Applications

et al. 2021

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Polymer gels and films, due to their near equivalence to biological tissue, are amongst the most promising future dosimetry tools for medical applications. The application of polymer dose gels is limited by the sensitivity of dose readout methods and dose gel properties. It is a challenge to find suitable dosimeters for registration of doses delivered to the target by orthovoltage therapy units. The application of metal-particle-enriched polymer composites for dose registration in X-ray therapy might be an elegant solution, especially if recent dose-reading technologies exploring advantages of different physical phenomena are involved. In this work, X-rays from the orthovoltage therapy range were used for the irradiation of experimental samples. In addition, radiation-induced processes of formation of silver nanoparticles in AgNO3–PVA gels and in free standing AgNO3PVA films, also containing some additional solvents, namely glycerol, ethanol, and isopropanol, have been investigated, with the aim to apply the developed composites for medical dosimetry purposes. A simple and environmentally friendly method for the formation of free-standing AgPVA films at room temperature was proposed and realized for preparing AgPVA films for investigation. Radiation-induced synthesis of silver nanoparticles in AgPVA composites was investigated, analyzing LPSR-based UV-VIS spectral changes to the irradiated films with respect to irradiation doses, and dose-related tendencies were also evaluated. It was shown that AgPVA films were more sensitive for detection of doses from the interval 0–1.0 Gy, thus indicating potential application of AgPVA films for dosimetry purposes.

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Preliminary Study on Electron Spin Resonance Dosimetry Using Affected Cattle Teeth Due to the Fukushima Daiichi Nuclear Power Plant Accident

Cited by 4 publications

References 24 publications

L-Band Electron Paramagnetic Resonance Tooth Dosimetry Applied to Affected Cattle Teeth in Fukushima

L-Band Electron Paramagnetic Resonance Tooth Dosimetry Applied to Affected Cattle Teeth in Fukushima

Electron Paramagnetic Resonance Characterization of Sodium- and Carbonate-Containing Hydroxyapatite Cement

Development and Characterization of Silver Containing Free Standing Polymer FILMS for Dosimetry Applications

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