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

Urals Research Center for Radiation Medicine, Tscheljabinsk, Chelyabinsk, Russia
Radiation Measurements (Impact Factor: 1.21). 05/2006;,. DOI: 10.1016/j.radmeas.2005.12.003


Samples of calcified tooth tissues (enamel, root and crown dentine) collected from the Techa riverside population exposed to radiation caused by radioactive releases from the nuclear weapon plant in South Ural were investigated. Accumulated absorbed dose in the samples was measured using the EPR-spectroscopy method. Beta activity of the samples containing radioactive 90Sr was measured by the method of low background anti-coincidence thin scintillating detection. High correlation between absorbed dose and beta activity was observed for enamel and root dentin but not for crown dentin. Otherwise, poor correlation was observed between absorbed doses as well as between beta activities for different tooth tissues of the same tooth. The results of dose measurement by EPR spectroscopy are analysed with the use of Monte Carlo simulation of dose formation due to 90Sr incorporated in tooth tissues taking into account biological elimination of 90Sr. Influence of 90Sr distribution in the tooth body on absorbed dose is discussed.

Download full-text


Available from: Alexander Ivannikov, Oct 03, 2015
19 Reads
  • Source
    • "In 2009, the measured 90Sr/90Y activity in tooth enamel was 2.1 ± 1.1 Bq/g. The estimated cumulated internal dose was 800 ± 400 mGy, 50 years after uptake of 90Sr in 1957, calculated with a dose rate coefficient of 0.056 nGy/g/s, assuming only radioactive decay without biological removal of 90Sr from enamel (Tikunov et al. 2006), which is close to the measured total absorbed dose in enamel of 1,190 mGy. 90Sr content below detection limit was found for one tooth (ID 2033) with absorbed dose in enamel of 226 mGy. "
    [Show abstract] [Hide abstract]
    ABSTRACT: In 1945, within the frame of the Uranium Project for the production of nuclear weapons, the Mayak nuclear facilities were constructed at the Lake Irtyash in the Southern Urals, Russia. The nuclear workers of the Mayak Production Association (MPA), who lived in the city of Ozyorsk, are the focus of epidemiological studies for the assessment of health risks due to protracted exposure to ionising radiation. Electron paramagnetic resonance measurements of absorbed dose in tooth enamel have already been used in the past, in an effort to validate occupational external doses that were evaluated in the Mayak Worker Dosimetry System. In the present study, 229 teeth of Ozyorsk citizens not employed at MPA were investigated for the assessment of external background exposure in Ozyorsk. The annually absorbed dose in tooth enamel from natural background radiation was estimated to be (0.7 ± 0.3) mGy. For citizens living in Ozyorsk during the time of routine noble gas releases of the MPA, which peaked in 1953, the average excess absorbed dose in enamel above natural background was (36 ± 29) mGy, which is consistent with the gamma dose obtained by model calculations. In addition, there were indications of possible accidental gaseous MPA releases that affected the population of Ozyorsk, during the early and late MPA operation periods, before 1951 and after 1960.
    Biophysik 03/2014; 53(2). DOI:10.1007/s00411-014-0527-8 · 1.53 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Mounting a successful online training course takes a concerted effort by a team of experts in diverse fields. This paper describes the development of a program designed to teach business English and the concepts of business communication to an international audience via the Internet. This online business English course is being developed by a private corporation (Virtual Languages Inc.), with the cooperative efforts of a university (the Florida Institute of Technology). Content experts, ESL (English as a second language) professionals, Web page designers, graphic artists and sound technicians, plus corporate officers, bring together the expertise needed to mount this innovative online course
    Professional Communication Conference, 1999. IPCC 99. Communication Jazz: Improvising the New International Communication Culture. Proceedings. 1999 IEEE International; 02/1999
  • [Show abstract] [Hide abstract]
    ABSTRACT: The approach of the Year 2000 (Y2K) has called into question the condition of readiness of computer systems upon which organizations depend. Will these systems operate reliably after midnight, January 1, 2000, or will problems associated with date calculations cause failures that adversely affect users? This question has caused organizations to identify their critical systems, test these systems for Y2K problems, and take corrective action where necessary to ensure Y2K readiness. This paper examines various technical and management issues that Southwest Research Institute has dealt with in solving these problems
    IEEE Aerospace and Electronic Systems Magazine 12/1999; 14(11):3-9. DOI:10.1109/62.809194 · 0.96 Impact Factor
Show more