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Optically stimulated luminescence (OSL) dating as a absolute dating method for sediments has been widely used in Quaternary studies. Improving the accuracy and precision of OSL dating has been a hot spot in academic research. However, for a long time, there have been numerous studies on equivalent dose measurement procedures and calculation methods, and relatively few studies on environmental dose rates. In this paper, we conducted OSL chronology study on marine sediment samples obtained from the Borehole ZBW in the southwestern of Hainan Province. The contents of uranium, thorium and potassium in the samples were measured by inductively coupled plasma mass spectrometry/optical emission spectrometry (ICP-MS/OES), neutron activation analysis (NAA) and γ-ray spectrometer, respectively. The results show that there are differences in the results measured by the three methods in some strata, and the reasons could be: (1) incomplete dissolution of U in heavy minerals during the ICP-MS/OES pretreatment process; (2) the ICP-MS/OES measurement results are the elemental contents of U, Th, and K, which include some non-radionuclide contents; (3) the small sample size used for NAA, which was subject to chance errors, and the dilution effect of non-radioactive material in the sample affects the measurement results; (4) there is an imbalance of uranium system in the sample. Combined with the sedimentary environment in the study area and the data measured by HPGe γ-ray spectrometer, the results show that the uranium imbalance originates from the autogenous uranium absorption phenomenon, and the effect on the environmental dose rate is about 11%.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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