科研之友
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摘要
A method to determine the background annual dose rates for further dating of loess deposits is detailed presented. The proposed method can identify the contributions of any radionuclide belonging to the natural radioactive series as well those of the K-40 by taking into account the overlapping gamma ray spectral lines. Before to be applied on loess samples, the method was checked on the IAEA-RGTh-1 reference material, giving a good agreement between certified IAEA-RGTh-1 values and our determinations, i.e., t = -0.011 for a paired t-test at p %26gt; 0.991. Applied to loses collected from different horizons, it was possible not only to calculate the annual dose rates, whose values ranged between 2.49 and 3.19 mGy/y but also to evidence that in all samples, regardless their position within loess deposit, all three natural radioactive series were in secular equilibrium.
- 出版日期2014
