Exposure Rate Dependence of the CO33- Signal Intensity in ESR Dosimetry of Human Tooth Enamel.

Iwasaki, Midori; Miyazawa, Chyuzo; Uesawa, Teruo; Suzuki, Einobu; Hoshi, Masaharu; Niwa, Katsumi

doi:10.3769/radioisotopes.41.12_642

Cited by 8 publications

(2 citation statements)

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“…Then, the dose accumulated in tooth enamel has been related to ESR signal to be detected. [5][6][7] Organ doses, however, are ultimate quantities required for a retrospective individual dose assessment. Then, it is necessary to correlate quantitatively the measured dose by the ESR dosimetry to organ doses of interest.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Absorbed Dose to Tooth Enamel for ESR Dosimetry

Takahashi

Yamaguchi

Saitô

et al. 2002

Journal of Nuclear Science and Technology

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Absorbed dose to tooth enamel was quantitatively correlated to organ doses by Monte Carlo calculations using the Electron Gamma Shower Code Version 4 for the Electron Spin Resonance (ESR) dosimetry using teeth. A region for teeth was newly added to a mathematical human model. Kerma coefficients for whole tooth and enamel part were prepared to estimate the dose to tooth enamel. Experiments were also carried out with a physical head phantom, which is made of tissue equivalent materials. Tooth samples and thermo-luminescence dosimeters (TLDs) ofCaS04 crystal were set at the teeth position in the head phantom. Additional Monte Carlo calculations were performed to verify the results of the experiments by using a Voxel-type phantom reconstructed from computed tomographic (CT) images of the physical phantom. The obtained data are to be useful for retrospective dose assessments in past radiation events by the ESR dosimetry with teeth.

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Section: Introductionmentioning

confidence: 99%

Analysis of Absorbed Dose to Tooth Enamel for ESR Dosimetry

Takahashi

Yamaguchi

Saitô

et al. 2002

Journal of Nuclear Science and Technology

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“…5) Intensity of ESR signals has been related to dose accumulated in tooth enamel. [6][7][8][9][10] Individual dose reconstruction, however, ultimately requires doses to organs of interest, while ESR dosimetry determines just tooth enamel dose. The enamel dose, therefore, was quantitatively related to organ doses by Monte Carlo calculations using a modified MIRD-type phantom with a newly defined teeth region against external photon exposure.…”

Section: Introductionmentioning

confidence: 99%

Conversion from Tooth Enamel Dose to Organ Doses for Electron Spin Resonance Dosimetry.

Takahashi

Yamaguchi

Iwasaki

et al. 2002

J. Nucl. Sci. Technol.

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Conversion from tooth enamel dose to organ doses was analyzed to establish a method of retrospective individual dose assessment against external photon exposure by electron spin resonance (ESR) dosimetry. Dose to tooth enamel was obtained by Monte Carlo calculations using a modified MIRD-type phantom with a teeth part. The calculated tooth enamel doses were verified by measurements with thermo-luminescence dosimeters inserted in a physical head phantom. Energy and angular dependences of tooth enamel dose were compared with those of other organ doses. Additional Monte Carlo calculations were performed to study the effect of human model on the tooth enamel dose with a voxel-type phantom, which was based on computed tomography images of the physical phantom. The data derived with the modified MIRD-type phantom were applied to convert from tooth enamel dose to organ doses against external photon exposure in a hypothesized field, where scattered radiation was taken into account. The results indicated that energy distribution of photons incident to a human body is required to evaluate precisely an individual dose based on ESR dosimetry for teeth.

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