No abstract available

[en] CIAE's (China Institute of Atomic Energy) installation for burning organic liquid wastes was built in 1986. A total of 1.7 tons of waste engine oil containing tritium (10⁵ Bq/L) were burned from Aug. to Sep., 1989. The result of monitoring showed that the burning resulted in a maximum tritium concentration of 13.3 Bq/m³ in the air. The results of monitoring were coincide with that of model estimation. The resulted maximum individual dose equivalent was some 0.32 μSv

[en] The authors mainly introduce the meaning of the environmental radiation capacities and the methodologies of determining them, the environmental radiation capacities of each of the environmental elements (atmosphere, surface water and groundwater) and the total environmental radiation capacities in the area of CIAE have been estimated by all-path-ways methods. This work will provide the scientific evidences to draft the long-term developing plans and to arrange the new facilities reasonably for CIAE

[en] Gonad mean annual absorbed dose from external penetrating radiation for Beijing residents is 73.4 mrad/y of which the annual absorbed dose from cosmic ray is 27.1 mrad/y and that from natural radioactivity in building materials is 37.6 mrad/y. The construction of buildings and roads makes the annual absorbed dose change. The construction of buildings brings about an increase of 19.7 per cent in the annual absorbed dose. The construction of roads results in a reduction of 2.4%

[en] This paper describes the indoor absorbed dose rate in air in Beijing. The average indoor absorbed dose rate in air is 8.29 μrad/h. The ratio of indoor to outdoor absorbed dose rate for 849 buildings is 1.51

[en] A novel synthesis of CdS_1-xSe_x solid solution is presented, which is based on the room temperature reaction among CdO(CdCO₃, CdCl₂), Na₂S.9H₂O and Se powders. XRD and composition analysis results show that the composition of CdS_1-xSe_x is related to the Cd sources. Namely, CdS_0.54Se_0.46 has been obtained from CdO precursor, and CdS_0.75Se_0.25 has been obtained from CdCO₃ or CdCl₂ precursors. The excess Na₂S.9H₂O plays crucial role for the formation of CdS_1-xSe_x, by which the solid phase reaction mechanism has been discussed. The optical properties of CdS_0.54Se_0.46 and CdS_0.75Se_0.25 were characterized by absorption spectrum and fluorescent spectrum, respectively. The average sizes of particles are about 1.67-2.49 μm by the Ls601-Laser particle analysis instrument measurement

No abstract available

[en] A new ZnS/niobate composite was first synthesized through two processes: (1) self-assembly of [Ca₂Nb₃O₁₀]_n^n- nanosheets in Zn(NH₃)₄²⁺ solution; (2) formation of ZnS/niobate composite by adding Na₂S to the former reacting system. X-ray diffraction (XRD) result shows that the as-prepared ZnS/niobate composite can be indexed to tetrahedral symmetry with a=5.450(2) and c=16.904(7) A. The uniform distributions of Zn, Ca, Nb, S and O element in the particles were demonstrated by scanning electron microscope (SEM) and energy dispersive spectrometer (EDS). The optical property of the composite was characterized by photoluminescence spectra and UV-vis absorption spectra. - Graphical abstract: ZnS/niobate composites were first synthesized by exfoliation/self-assembly processing. The composites were characterized by X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM) and energy dispersive spectrometer (EDS), IR spectrum, UV-vis spectrum, and photoluminescent spectrum. The photoluminescence spectrum of the ZnS/niobate composite shows blue shift attributed to quantum sizes effects.