Effect of Sample Grain Size on the CO33- Signal Intensity in ESR Dosimetry of Human Tooth Enamel.

Iwasaki, Midori; Miyazawa, Chyuzo; Uesawa, Teruo; Niwa, Katsumi

doi:10.3769/radioisotopes.42.470

Cited by 23 publications

(8 citation statements)

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“…However, the situation may be more complex than presented by Sholom et al (1998a). Iwasaki et al (1993) reported a 10% higher radiation response for grains smaller than 75 µm in samples irradiated before grinding, which was attributed to an underlying distortion of the baseline between 0 and 500 mT. Finally, the possible effect of absence of secondary electron equilibrium during irradiation should not be overlooked (see above and Ivannikov et al, 2004a).…”

Section: Parameters Affecting the Sensitivity Of Tooth Enamel To Radimentioning

confidence: 93%

“…Iwasaki et al (1993) have shown that the full range of repeated measurements of signals of equal-weight samples with approximately 1.5 -2 mm grains is 10-27%, whereas it decreases to 3-4% for smaller grains (0.1 -0.8 mm). Hayes et al (1998) have shown that, when a single small piece of enamel is repeatedly inserted into a cavity in a quartz sample tube, the signal peak-to-peak amplitudes in the perpendicular-orientation range vary over 50%.…”

Section: Anisotropymentioning

confidence: 99%

“…In order to give an order of magnitude of the related uncertainties, we are quoting the repeatability of the dosimetric signal amplitude of about (3-4)% for grain sizes below 1 mm (Iwasaki et al, 1993).…”

Section: Effect Of Sample Anisotropymentioning

confidence: 99%

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EPR dosimetry with tooth enamel: A review

Fattibene

Callens

2010

Applied Radiation and Isotopes

208

160

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When tooth enamel is exposed to ionizing radiation, radicals are formed that can be detected using Electron Paramagnetic Resonance (EPR) techniques. EPR dosimetry using tooth enamel is based on the (presumed) correlation between the intensity or amplitude of some of the radiation-induced signals with the dose absorbed in the enamel. In the present paper a critical review is given of this widely applied dosimetric method.The first part of the paper is quite fundamental and deals with the main properties of tooth enamel and several of its model systems (e.g., synthetic apatites). Considerable attention is also devoted to the numerous radiation-induced and native EPR signals, and the radicals responsible for them. The relevant EPR detection, identification and spectrum analysing methods are reviewed from a general point of view. Finally, the need for solid state modelling and the linearity of the dose response are investigated.The second part is devoted to the practical implementation of EPR dosimetry using enamel. It concerns the preparation of samples, specific irradiation problems, spectrum acquisition and it is described how the dosimetric signal intensity and dose can be retrieved from the EPR spectra. Special attention is paid to the energy dependence of the EPR response and to sources of uncertainties. Results of and problems encountered in international intercomparisons and epidemiological studies are also dealt with.In the final chapter the future of EPR dosimetry with tooth enamel is analysed.

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Section: Parameters Affecting the Sensitivity Of Tooth Enamel To Radimentioning

confidence: 93%

Section: Anisotropymentioning

confidence: 99%

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EPR dosimetry with tooth enamel: A review

Fattibene

Callens

2010

Applied Radiation and Isotopes

208

160

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“…This variation gives appropriate relative contribution to the uncertainty of dose determination in enamel at the use of universal calibration coefficient, which was taken into account at error estimation. For enamel grain size used, contribution to the uncertainty of radiation-induced signal amplitude due to sample anisotropy was accepted as not exceeding 5% (Iwasaki et al, 1995). The uncertainty of dose determination in enamel (U e , in Gy) was estimated using an expression analogous to that derived in Ivannikov et al (2002), which comprises constant, variable depending on sample quality and dose dependent contributions:…”

Section: Dose Determination In Enamelmentioning

confidence: 99%

Complex experimental research on internal tooth dosimetry for the Techa River region: A model for 90Sr accumulation in human teeth formed by time of intakes

Tikunov

Ivannikov

Shishkina

et al. 2006

Radiation Measurements

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“…The unwanted native or background signals eventually over- or underestimate the absorbed doses in enamel. However, the grain sizes 0.5 – 1 mm have been proven to be optimal for minimizing the effects of sample anisotropy in tooth enamel (Iwasaki et al 1993; Haskell et al 1997). Still, tooth enamel is a crystalline material and can show minor anisotropy effects in this optimal grain size, which may over- or underestimate the absorbed doses in enamel.…”

Section: Resultsmentioning

confidence: 99%

Electron Paramagnetic Resonance Measurements of Lifetime Doses in Teeth of Durham Region Residents, Ontario

Ghimire

Waller²

2022

Health Physics

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The Canadian Nuclear Safety Commission (CNSC) and Ontario Power Generation (OPG) determined the total dose contribution of nuclear power plants in Durham Region populations by analyzing environmental samples from the surrounding areas of both nuclear generating stations (Pickering and Darlington). However, the total doses from the various sources were unknown in Durham Region populations, Ontario. Electron paramagnetic resonance (EPR) dosimetry with tooth enamel has been successfully established as an effective tool for gamma dose assessment for chronic and acute exposures in individuals, groups, or populations to reconstruct the absorbed dose down to 30 mGy. This study collected the extracted teeth from people of different ages in Durham Region, Ontario, and analyzed them using the x-band continuous wave (CW) EPR spectrometer. The total dose rate from the natural and anthropogenic sources was 1.9721 mSv y−1. The anthropogenic dose rate from the various sources was 0.6341 mSv y−1, about 47.39% of the natural background dose (1.338 mSv y−1) in Durham Region, Ontario. The combined anthropogenic doses from these sources were lower than the local background dose in Durham Region and lower than the regulatory annual effective dose limit of 1 mSv y−1 in Canada. Based on these data, this study concluded that the anthropogenic dose contribution was lower than the regulatory limit to the local populations.

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Effect of Sample Grain Size on the CO33- Signal Intensity in ESR Dosimetry of Human Tooth Enamel.

Cited by 23 publications

References 0 publications

EPR dosimetry with tooth enamel: A review

EPR dosimetry with tooth enamel: A review

Complex experimental research on internal tooth dosimetry for the Techa River region: A model for 90Sr accumulation in human teeth formed by time of intakes

Electron Paramagnetic Resonance Measurements of Lifetime Doses in Teeth of Durham Region Residents, Ontario

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