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A Study on the Dose-Rate of Holocene Sediment in the Middle Part of the Loess Tableland

Zhou Ya-li

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Abstract

Twenty Holocene sediment samples were collected from the middle part of the loess tableland.The mass concentrations of the radioactive elements U,Th,K were determined by neutron activation analysis(NAA).And the natural dose-rate was calculated.The analytical results indicated that dose-rate was influenced by the grain-size composition of sediment and climate change.The natural dose-rate is maximum in the layers of paleoflood slack water deposit,and the loess layers is minimum,the soil layer is in the middle.

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What this paper is about

Twenty Holocene sediment samples were collected from the middle part of the loess tableland.The mass concentrations of the radioactive elements U,Th,K were determined by neutron activation analysis(NAA).And the natural dose-rate was calculated.The analytical results indicated that dose-rate was influenced by the grain-size composition of sediment and climate change.The natural dose-rate is maximum in the layers of paleoflood slack water deposit,and the loess layers is minimum,the soil layer is in the middle.

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Available abstract

Twenty Holocene sediment samples were collected from the middle part of the loess tableland.The mass concentrations of the radioactive elements U,Th,K were determined by neutron activation analysis(NAA).And the natural dose-rate was calculated.The analytical results indicated that dose-rate was influenced by the grain-size composition of sediment and climate change.The natural dose-rate is maximum in the layers of paleoflood slack water deposit,and the loess layers is minimum,the soil layer is in the middle.

Key concepts: Loess, Holocene, Sediment, Geology, Neutron activation analysis, Grain size, Natural (archaeology), Sedimentation

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