EPR and TL-based beta dosimetry measurements in various tooth components contaminated by 90Sr
Articolo
Data di Pubblicazione:
2008
Citazione:
EPR and TL-based beta dosimetry measurements in various tooth components contaminated by 90Sr / I. Veronese, P. Fattibene, M.C. Cantone, V. De Coste, A. Giussani, S. Onori, E.A. Shishkina. - In: RADIATION MEASUREMENTS. - ISSN 1350-4487. - 43:2-6(2008), pp. 813-818.
Abstract:
Thermoluminescence-based beta dosimetry, previously proposed for the estimate of the internal contamination in teeth, and EPR has been
used in this paper to investigate the homogeneity of 90Sr contamination and of dose within nine teeth of one person born in the year of the
onset of waterborne radioactive releases of the Mayak plutonium facility. A large deviation of dose and activity distributions in both enamel
and radical dentine of the various teeth was observed. Average dose was 27 ± 7Gy in enamel and 0.90 ± 0.31 Gy in radical dentine. Average
90Sr concentration was 52 ± 8Bq/g in enamel and 5 ± 2Bq/g in radical dentine. The observed deviation around the mean value of dose and
90Sr concentration can be explained due to the specific mineral evolution of each tooth at the time of Sr intake. In the same donor, a negative
correlation was also observed between radical dentine and enamel for the 90Sr specific activity as well for the dose.
Similar analyses performed on one massive molar belonging to a second donor revealed absence of correlation between dose and 90Sr
concentration in the same tissue, indicating a dose contribution from 90Sr present in neighbouring tissue compartments. Systematic differences
in cumulated dose and activity levels between the lingual and the buccal parts of crown dentine and of enamel were also observed.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
Electron paramagnetic resonance; Techa River; Thermoluminescence; Tooth
Elenco autori:
I. Veronese, P. Fattibene, M.C. Cantone, V. De Coste, A. Giussani, S. Onori, E.A. Shishkina
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