Concentrations of 90Sr in the tooth tissues 60 years after intake : results of TL measurements and applications for Techa River dosimetry
Articolo
Data di Pubblicazione:
2014
Citazione:
Concentrations of 90Sr in the tooth tissues 60 years after intake : results of TL measurements and applications for Techa River dosimetry / E.A. Shishkina, E.I. Tolstykh, E. Verdi, A.Y. Volchkova, I. Veronese, N.A. El Faramawy, H.Y. Göksu, M.O. Degteva. - In: RADIATION AND ENVIRONMENTAL BIOPHYSICS. - ISSN 0301-634X. - 53:1(2014 Mar), pp. 159-173. [10.1007/s00411-013-0501-x]
Abstract:
This article focuses on the study of 90Sr in the tooth tissues of Techa riverside residents 60 years after intake. The Techa River was contaminated by radioactive wastes in the 1950s. Contamination of the river system, including water, bottom sediment, floodplain soil, and grass, depended on the distance from the source of releases. Therefore, the average 90Sr intake was different in different settlements located downstream the river. An additional factor influencing 90Sr accumulation in the teeth is the rate of tissue mineralization at the time of intake which depended on the donor’s age at the time of releases. Measurements of 90Sr concentration in various dental tissues (enamel, crown, and root dentin) of 166 teeth were performed about 60 years after the main intake using the method of thermoluminescence passive beta detection. The paper presents the current levels of tooth tissue contamination, and the tooth-to-tooth variability of 90Sr concentration in tooth tissues was assessed for the tissues which were matured at the time of massive liquid radioactive waste releases into the Techa River. A model describing the expected levels of 90Sr in matured dental tissues depending on age and intake has been elaborated for the population under study. The results obtained will be used for calculation of internal dose in enamel and for interpretation of tooth doses measured by means of the electron paramagnetic resonance method, among the population of the Techa River region.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
Dentin; Enamel; Intake; PTL; Teeth
Elenco autori:
E.A. Shishkina, E.I. Tolstykh, E. Verdi, A.Y. Volchkova, I. Veronese, N.A. El Faramawy, H.Y. Göksu, M.O. Degteva
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