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Comparative analysis of dose rates in bricks determined by neutron activation analysis, alpha counting and X-ray fluorescence analysis for the thermoluminescence fine grain dating method
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SYSNO ASEP 0197584 Document Type M - Monograph Chapter R&D Document Type Monograph Chapter Title Hospodyně. (Heslo v atlasu) Title Housewife. (Entry in atlas) Author(s) Čižmárová, Libuše (UJC-A) ORCID Number of authors 4 Source Title Radiation Physics and Chemistry. - : Elsevier - ISSN 0969-806X
Roč. 104, NOV (2014), s. 393-397Number of pages 5 s. Publication form Print - P Action 1st International Conference on Dosimetry and its Applications (ICDA) Event date 23.6.2013-28.6.2013 VEvent location Prague Country CZ - Czech Republic Event type WRD Language eng - English Country GB - United Kingdom Keywords Alpha coutning ; neutron activation analysis ; X-ray fluorescence ; thermoluminescence dating ; dose rate Subject RIV CB - Analytical Chemistry, Separation R&D Projects LM2011019 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support UJF-V - RVO:61389005 UT WOS 000341463600083 DOI https://doi.org/10.1016/j.radphyschem.2014.03.040 Annotation In order to evaluate the age from the equivalent dose and to obtain an optimized and efficient procedure for thermoluminescence dating, it is necessary to obtain the values of both the internal and the external dose rates from dated samples and from their environment. The measurements described and compared in this paper refer to bricks from historic buildings and a fine-grain dating method. The external doses are therefore negligible, if the samples are taken from a sufficient depth in the wall. However, both the alpha dose rate and the beta and gamma dose rates must be taken into account in the internal dose. The internal dose rate to fine-grain samples is caused by the concentrations of natural radionuclides U-238, U-235, Th-232 and members of their decay chains, and by K-40 concentrations. Various methods can be used for determining trace concentrations of these natural radionuclides and their contributions to the dose rate. The dose rate fraction from U-238 and Th-232 can be calculated, from the alpha count rate, or from the concentrations of U-235 and Th-232, measured by neutron activation analysis. The dose rate fraction from K-40 can be calculated from the concentration of potassium measured, by X-ray fluorescence analysis or by NAA. Workplace Nuclear Physics Institute Contact Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228 Year of Publishing 2015
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