In this paper a technique for determining ^235U abundance is described. After chemical separation, uranium-rich ore (a compound of uranium with chemical and radioactive pure)is made into U3O8 by burning at 850℃, and ...In this paper a technique for determining ^235U abundance is described. After chemical separation, uranium-rich ore (a compound of uranium with chemical and radioactive pure)is made into U3O8 by burning at 850℃, and then the U3O8 is prepared as the radioactive measuring source with a definite weight and shape. The measurement is carried out of the net area of 185.7 keV γ -ray peak of ^235U by Ge (Li) γ -ray spectrometer, with the mixture of a number of primary uranium ores as normal abundance standard. Parallel analysis and counting are performed on the standard and samples with the same method. The abundance of ^235U will be known by comparing their net areas of 185.7 keV γ ray peaks of ^235U both in the samples and the standard. Two samples of uranium ore from China which are suspected to be anomalous in U abundance and one sample from Oklo natural reactor have been determined. The precision of the method is better than 1%.展开更多
IR Li2Ga2GeS6 nonlinear crystals were directly obtained with the composition of 40GeS2- 30Ga2Ss-30LieS, by the conventional melt-quenching method. The high depth digital image indicated that the obtained LizGa2GeS6 cr...IR Li2Ga2GeS6 nonlinear crystals were directly obtained with the composition of 40GeS2- 30Ga2Ss-30LieS, by the conventional melt-quenching method. The high depth digital image indicated that the obtained LizGa2GeS6 crystals showed a big size of 0.3 × 0.25 × 0.3 mm3. It was shown that the compound was very suscepfive to H20 with second harmonic observation. Besides, the glass-forming region of GeS2-Ga2S3- Li2S system was further studied by the conventional melt-quenching method.GeS2-Ga2S3-Li2S glass-ceramics containing IR Li2Ga2GeS6 nonlinear nanocrystals were obtained at a more carefully controlled heating rate.展开更多
文摘In this paper a technique for determining ^235U abundance is described. After chemical separation, uranium-rich ore (a compound of uranium with chemical and radioactive pure)is made into U3O8 by burning at 850℃, and then the U3O8 is prepared as the radioactive measuring source with a definite weight and shape. The measurement is carried out of the net area of 185.7 keV γ -ray peak of ^235U by Ge (Li) γ -ray spectrometer, with the mixture of a number of primary uranium ores as normal abundance standard. Parallel analysis and counting are performed on the standard and samples with the same method. The abundance of ^235U will be known by comparing their net areas of 185.7 keV γ ray peaks of ^235U both in the samples and the standard. Two samples of uranium ore from China which are suspected to be anomalous in U abundance and one sample from Oklo natural reactor have been determined. The precision of the method is better than 1%.
基金Funded by the National Natural Science Foundation of China(No.51272183)the Nanotechnology Program of Suzhou(No.ZXG201438)
文摘IR Li2Ga2GeS6 nonlinear crystals were directly obtained with the composition of 40GeS2- 30Ga2Ss-30LieS, by the conventional melt-quenching method. The high depth digital image indicated that the obtained LizGa2GeS6 crystals showed a big size of 0.3 × 0.25 × 0.3 mm3. It was shown that the compound was very suscepfive to H20 with second harmonic observation. Besides, the glass-forming region of GeS2-Ga2S3- Li2S system was further studied by the conventional melt-quenching method.GeS2-Ga2S3-Li2S glass-ceramics containing IR Li2Ga2GeS6 nonlinear nanocrystals were obtained at a more carefully controlled heating rate.
