0433699 - ÚJF 2015 RIV GB eng J - Journal Article
Bártová, H. - Kučera, Jan - Musílek, L. - Trojek, T.
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.
Radiation Physics and Chemistry. Roč. 104, NOV (2014), s. 393-397. ISSN 0969-806X. E-ISSN 1879-0895.
[1st International Conference on Dosimetry and its Applications (ICDA). Prague, 23.6.2013-28.6.2013]
R&D Projects: GA MŠMT(XE) LM2011019
Institutional support: RVO:61389005
Keywords : Alpha coutning * neutron activation analysis * X-ray fluorescence * thermoluminescence dating * dose rate
Subject RIV: CB - Analytical Chemistry, Separation
Impact factor: 1.380, year: 2014

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.
Permanent Link: http://hdl.handle.net/11104/0237864