Electron paramagnetic resonance (EPR) biodosimetry

Desrosiers, Marc F.; Schauer, David A

doi:10.1016/s0168-583x(01)00614-0

Cited by 80 publications

(64 citation statements)

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“…However, most of these reviews either covered only selected aspects of the method (Pass, 1997;Bhat, 2005), or were limited in size (Desrosiers and Schauer, 2001;Romanyukha and Regulla, 1996;Regulla, 2005;Romanyukha et al, 2000a), or were focused on the comparison of EPR dosimetry with other dosimetric techniques (Straume et al, 1997;Kleinerman et al, 2006). In 2002, an extensive report prepared by a group of authors was published by IAEA (IAEA, 2002).…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

EPR dosimetry with tooth enamel: A review

Fattibene

Callens

2010

Applied Radiation and Isotopes

208

160

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“…The other method uses a universal calibration curve (EPR signal Intensity versus absorbed dose) generated using a large blended sample pool of enamel material designed to average the sample-to-sample variances. For doses greater than a few hundred mGy, the variation in EPR signal intensity from sample to sample for tooth enamel is about 10%, however, dose reconstruction using the universal calibration curve method is much less time-consuming and is non destructive (Desrosiers, M., and Schauer, D.A., 2001). Some other techniques are not widely used (Lanjanian, H., et al, 2008).…”

Section: Retrospective and Emergency Dosimetry 541 Teeth Enamel Dosmentioning

confidence: 99%

“…8. The additive dose method for dose reconstruction is based on the re-irradiation (d 1 -d 5 ) of a tooth sample to obtain a sample-specific dose response curve, which is used to back extrapolate to the absorbed dose value (Desrosiers, M., and Schauer, D.A., 2001). …”

Section: Retrospective and Emergency Dosimetry 541 Teeth Enamel Dosmentioning

confidence: 99%

“…Many studies have demonstrated that retrospective measurements of dose by examination of isolated teeth with higher frequency EPR can provide very accurate estimates of dose at times ranging from immediately after the exposure to archeologically relevant times (Desrosiers and Schauer, 2001). The practical problem with this approach for acute dosimetry is the need to remove the tooth from the mouth.…”

Section: Measurements In "Biopsies" Of Teeth Using 9500 Mhz Eprmentioning

confidence: 99%

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Ionizing Radiation Induced Radicals

Maghraby¹

2012

Current Topics in Ionizing Radiation Research

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“…

RESUMO

Introdução e objetivoRadiações ionizantes produzem, em certas substâncias, uma quantidade de centros paramagnéticos proporcional à dose absorvida [3]. Tal quantidade pode ser obtida por espectrometria de Ressonância Paramagnética Eletrônica (Electron Paramagnetic Ressonance -EPR) [5], sendo a técnica de interesse para a área de dosimetria das radiações.

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Eliminação de ruído AWGN de sinais de espectrômetros de EPR por Transformada Discreta de Fourier, com aplicação em dosimetria das radiações

Vieira¹,

Bevilacqua²,

Rodrigues³

2015

Proceeding Series of the Brazilian Society of Computational and Applied Mathematics

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RESUMO Introdução e objetivoRadiações ionizantes produzem, em certas substâncias, uma quantidade de centros paramagnéticos proporcional à dose absorvida [3]. Tal quantidade pode ser obtida por espectrometria de Ressonância Paramagnética Eletrônica (Electron Paramagnetic Ressonance -EPR) [5], sendo a técnica de interesse para a área de dosimetria das radiações. Os espectrômetros produzem espectros brutos compostos de uma assinatura do material, relacionada à presença dos centros paramagnéticos, e de ruído, que advém de fontes diversas, como a eletrônica do equipamento e acoplamento do sistema formado por cavidade, tubo e amostra, e que pode ser eliminado por pós-processamento matemático. Neste trabalho, será desenvolvido um algoritmo para identificar automaticamente a frequência de corte e eliminar o ruído de alta frequência de sinais de EPR. Aplica-se um filtro passa-baixa na Transformada Discreta de Fourier (TDF) [1] do sinal amostrado, que em seguida é reconstruído por Transformada Inversa Discreta de Fourier (TIDF) [1]. O algoritmo será testado em sinais simulados com base em modelo teórico e em sinais experimentais obtidos com um espectrômetro Bruker modelo EMX operando na banda X. Modelagem matemática e algoritmoem que ( ) representa a assinatura do material e ( ), o ruído. A Figura 1 ilustra todo o processo sobre um sinal simulado, que foi gerado considerando-se que tem a forma de derivada de Gaussiana,sendo , com .

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Electron paramagnetic resonance (EPR) biodosimetry

Cited by 80 publications

References 41 publications

EPR dosimetry with tooth enamel: A review

EPR dosimetry with tooth enamel: A review

Ionizing Radiation Induced Radicals

Eliminação de ruído AWGN de sinais de espectrômetros de EPR por Transformada Discreta de Fourier, com aplicação em dosimetria das radiações

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