Resource Environment and Geographic Information System Beijing Key Laboratory

Beijing, China

Resource Environment and Geographic Information System Beijing Key Laboratory

Beijing, China

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Zhang B.,Capital Normal University | Zhang B.,Resource Environment and Geographic Information System Beijing Key Laboratory | Zhang B.,State Key Laboratory Cultivation Base Urban Environment Process and Digital Module | Wei M.-J.,Capital Normal University | And 20 more authors.
Yuanzineng Kexue Jishu/Atomic Energy Science and Technology | Year: 2013

The sequence of geological age on Nideping terrace in Dongchuan, Yunnan Province was established by thermoluminescence. The result shows that the age of the terrace is 9.3-57.1 ka. The vertical age of ancient debris flow terraces was established, and the time structure of Nideping mud was received. The age data was provided for the restoration ancient environment of the debris flow. It is shown that the debris flow deposits have discontinuities through age data and exist age inversion. The radioactive elements such as uranium, thorium, potassium may be leaching deposition affected by the presence of local rainfall and the annual dose rate increases with depth.


Liu C.,Capital Normal University | Liu C.,Resource Environment and Geographic Information System Beijing Key Laboratory | Liu C.,State Key Laboratory Cultivation Base Urban Environment Process and Digital Module | Wei M.-J.,Capital Normal University | And 5 more authors.
Yuanzineng Kexue Jishu/Atomic Energy Science and Technology | Year: 2010

Exampled by measuring the selected frequency luminescence characters of surface sand of the Badain Jaran Desert, a standard method was set up. The process of measuring the selected frequency luminescence characters includes three steps. 1) Confirming the radiation dose and characteristic wavelength by measuring the dose response curve. 2) Confirming the distribution of the luminescence photon wavelengths by measuring the received spectra of separated frequency. 3) Verification the setting of the radiation dose by measuring the dose response curve again.


Zhao Q.-Y.,Capital Normal University | Zhao Q.-Y.,Resource Environment and Geographic Information System Beijing Key Laboratory | Zhao Q.-Y.,State Key Laboratory Cultivation Base Urban Environment Process and Digital Module | Wei M.-J.,Capital Normal University | And 5 more authors.
Yuanzineng Kexue Jishu/Atomic Energy Science and Technology | Year: 2014

Glow curves of abundant quartz powder were obtained with the RGD-3B thermoluminescence (TL) reader. TL peaks with 448, 551, 654, 756 K were identified at the heating rate of 5 K/s. The activation energy, frequency factor and lifetime of trapped charge were evaluated at ambient temperature for four peaks by the method of various heating rates. Within a certain range of activation energy, the equivalent dose increases exponentially with the activation energy. The equivalent dose increases from 54 Gy to 485 Gy with the temperature from 548 K to 608 K, and it fluctuates around 531 Gy with the temperature from 608 K to 748 K.


Liu J.-X.,Capital Normal University | Liu J.-X.,Resource Environment and Geographic Information System Beijing Key Laboratory | Liu J.-X.,State Key Laboratory Cultivation Base Urban Environment Process and Digital Module | Wei M.-J.,Capital Normal University | And 11 more authors.
Hedianzixue Yu Tance Jishu/Nuclear Electronics and Detection Technology | Year: 2013

The TL background radiation of the modern debris flow materials of KeTai and XiBaiLianYu Gully, which in White River Basin of Beijing, was studied using the thermo luminescence technology. The research indicates that the thermo luminescence signal of debris flow materials reduced obviously in the process of flow. The average equivalent doses of the provenance, circulation area and the accumulation area are respectively 63.19, 52.42 and 49.54 Gy. Because of the light fading, the surface sample's background radiation is less than that of the samples 5~10 cm from the surface. The residual background radiation of the surface debris flow material in White River Basin is between 11.2 to 28.5 ka and the result provides a foundation for using thermo luminescence technology to date old debris flow.


Zhang B.,Capital Normal University | Zhang B.,Resource Environment and Geographic Information System Beijing Key Laboratory | Zhang B.,State Key Laboratory Cultivation Base Urban Environment Process and DigitalModule | Wei M.-J.,Capital Normal University | And 14 more authors.
Hedianzixue Yu Tance Jishu/Nuclear Electronics and Detection Technology | Year: 2012

The accurate measurement of equivalent doses is the key to the dating of debris flow samples. Using different radiation intervals measure debris flow material samples, the equivalent doses obtained are different, indicating irradiation interval impacts the equivalent dose of the debris flow material samples. Test debris flow samples used the known equivalent dose of 30 Gy, and measure them in different intervals of irradiation dosimetry. 2.5 Gy/min β-source ( 90Sr- 90Y) irradiation intervals were selected to 1, 2, 4, 6 min, the equivalent dose obtained respectively 19.3, 22.3, 26.4, 23.0 Gy; 8 Gy/ min of β source ( 90Sr- 90Y) irradiation intervals were selected to 0.5, 1, 1.5, 2 min, the equivalent dose obtained respectively 17.6, 19.6, 25.3, 15.6 Gy. The research indicate that he most suitable irradiation interval which by the dose rate 2.5 Gy/min of the β source ( 90Sr- 90Y)measure the debris flow material is 4 min. And the most suitable irradiation interval which by the dose rate 8 Gy/min of the β source ( 90Sr- 90Y) measure the debris flow material is 1.5 min.


Liu J.-X.,Capital Normal University | Liu J.-X.,Resource Environment and Geographic Information System Beijing Key Laboratory | Wei M.-J.,Capital Normal University | Wei M.-J.,Resource Environment and Geographic Information System Beijing Key Laboratory | And 6 more authors.
Yuanzineng Kexue Jishu/Atomic Energy Science and Technology | Year: 2012

The thermoluminescence age of the samples for ancient debris flow terraces material of Lingshan and Hongshuikou, which are in Qingshui River Basin of Beijing, was studied using the thermo luminescence technology. The age increases with the increasing depth of two ancient debris flow profile, and the deeper debris flow deposits material the more of the environmental radiation dose is. The trend with depth of U, Th and K contents and annual dose is consistency. And the change with depth of Th content is more discrete than that of U, K contents.

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