最新刊期
      卷 0 ， 期 0 ， 2020
      • Huang Zhigao
        Issue 4, (1992)
        摘要：The average hyperfine fields of amorphous Fe70Co20Zr10,Fe80Co10Zn10and Fe86Co4-Zr10 alloys at different temperature were measured by the Mossbauer technique. According to Bloch’s T3/2 relation, spin-wave exitations of above amorphous alloys were studied and their B3/2 values were found to be 0.40±0.02, 0.45±0.02 and 0.88±0.04, respectively. Comparing the B3/2 values of crystals, a-Fe-（Co, Ni）-ME, a-Fe-（Cr, Mn, W）-ME and a-Fe-B or TM-Zr Invar alloys, the obvious difference among them was observed. Above results can be explained well by the exchange coupling fluctuation and the disorder of spatial arrangement. In this work, the difference between the stiffness coefficients obtained from the inelastic neutron scattering and the magnetization measurements for amorphous Invar alloys was also explained.  
          
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        发布时间：2021-04-09
      • Huang Meifen Zhao Changyu Sun Ying
        Issue 4, (1992)
        摘要：The Mosbauer spectra of oxide scale of steel formed during heating have been studied. The results showed that （a） the dominating composition in the scale is FeO （ >70%）, Fe3O4 （-15% ） and some α-Fe2O3 （< 10% ）; （b） burning emulsified fuel oil would increase the ratio of Fe3O4 to FeO and toα-Fe2O3 in the oxide scale, especially in its inside layer.The calculation of equilibrium constants indicated that composition of the scale can vary with the change of PH2O/PH2 in the gaseous phase, which corresponded with the results of the Mossbauer measurement, thus satisfactorily explaining why the scale composition varied and the scale formation was decelerated when adopting emulsified fuel oil.  
          
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        发布时间：2021-04-09
      • Wang Jianguo Jiang Jianling
        Issue 4, (1992)
        摘要：A spectrum-stripping method is introduced to determine net area of the peak at 92.6keV for soil samples containing 238U.  
          
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        发布时间：2021-04-09
      • Song Quanxun
        Issue 4, (1992)
        摘要：A full automatic system controlled with micro-computers for NAA is described. All processes are automatically completed with an IBM-PC/XT micro-computer. The device is stable, reliable, flexible and convenient for use and has many functions and applications in automatical analysis of long, middle and short lived nuclides. Due to a high working efficiency of the instrument and micro-computers, both time and power can be saved. This method can be applied in other nuclear analysis techniques.  
          
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        发布时间：2021-04-09
      • Tian Jie Zhao Shujun Wu Yuelin Wang Yanxia
        Issue 4, (1992)
        摘要：A detection system for the extended X-ray absorption fine structure （EXAFS） spectrometer is described in detail. The plateau characteristic, absorption curves and linearity of the system are measured using X-rays with energy about 10keV. An oscillation phenomenon near K-shell absorption edge of nickel sample is observed by this detection system. The results are more accurate than those obtained by a detection system which consists of a proportional counter as the front detector and a NaI（Tl） scintillation counter as the rear detector.  
          
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        发布时间：2021-04-09
      • Guo Shilun Hao Xiuhong Wang Yulan Shen Guanren
        Issue 4, (1992)
        摘要：The determination of average energy and fluence of neutrons from 44GeV 12C+Cu （thick target） has been carried out at the synchrophasotron accelerator of Joint Institute for Nuclear Research, Dubna, USSR with CR-39 detectors. It is shown that the average energy is 15.8±2.8MeV and the fluence is （4.5±0.3）×109/cm2 at -60cm from the target and -70° to 12C beam when 6×1011 12C ions impinge on the target. This method can also be used to determine the angular distribution of neutrons from relativistic heavy ion interactions and the average neutron number per incident heavy ion or per interaction.  
          
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        发布时间：2021-04-09
      • Dai Yunsheng Cao Jianhua Wan Dairong Zhang Kun
        Issue 4, (1992)
        摘要：The total cross section of beryllium for 14.7MeV neutron was measured with a time-of-flight spectrometer.The experimental results were compared with those of calculation and other measurements.  
          
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        发布时间：2021-04-09
      • Ma Zhongquan Jin Tao Guo Qi
        Issue 4, (1992)
        摘要：The defects induced by 1.5 and 9.0 MeV electron and 2.0 MeV hydrogen ion at Si-SiO2 interface and in bulk P-type Si of MOS were investigated by using DLTS （Deep Level Transient Spectroscopy）,XPS（X-rayPhotoelectron Spectroscopy）and AES （Auger Electron Spectroscopy） techniques. Some new interface states and two bulk defects as HT1 （EV + 0.18eV, σP=2.8×10-16cm2） and HT2 （Ev+0.36eV, σp=3.3×10-17cm2） were found after e- and H+ irradiation. All the defects survive at RT. and after dynamic annealing, and capacitance of MOS was of failure when dose ofH+ ions was greater than 1 × 1014/cm2. Based on the profiles of defects observed,distribution of H+ in Si, and behaviour of annealing and Si atoms displacement It can be concluded that the two "hole traps" in the lower half of the band gap are mainly related to divacancy [V2],[SiH-VF] complex center and the damages of displacement atom SiD, but weakly related to energy deposition for H+ in silicon.  
          
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        发布时间：2021-04-09
      • Guo Shilun Hao Xiuhong Sun Shengfen Meng Wu Deng Xinlu
        Issue 4, (1992)
        摘要：A systematic stuuy and test of feasibility of uranium exploration by the fissiontrack method has been carried out.It is shown that the method has high sensitivity andreproducibility for uranium determination in natural water. The test indicated that thesensitivity and accuracy of the method in mapping uranium-rich halos in test grounds were higher than laser-fluorometry which was regarded as the most sensitive method before. A large area （560km2） exploration of uranium has been carried out and a uranium ore of industrial grade found. Some new rule of uranium-ore formation has been drawn from the study.  
          
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        发布时间：2021-04-09
      • Jin Tao Wang Mi Wu Jinzheng Guo Qi
        Issue 4, (1992)
        摘要：An extrapolation chamber dosimeter has been developed for clinical dosimetry of electron beams and X-rays from medical linear accelerators. It consists of a new type extrapolation chamber, a water phantom and an intelligent portable instrument. With a thin entrance window and aφ20 mm collecting electrode made of polystyrene, the electrode spacing can be varied from 0.2 to 6mm. The dosimeter can accomplish dose measurement automatically, and has functions of error self-diagnosis and dose self-recording. The energy range applicable is 0.5-20MeV, and the dose-rate range 0.02-40Gy/min. The total uncertainty is 2.1%.  
          
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        发布时间：2021-04-09
      • Deng Jianguo Yu Zengliang
        Issue 4, (1992)
        摘要：Various kinds of free radicals were measured at room temperature by the ESR spectrum method after seeds of rice, soybean, maize and green gram were irradiated with nitrogen ions. The g values of free radicals were calculated and the stability of free radicals was observed. Experimental results show that the free radical concentration in seeds increases with ion dose and gradually reaches to a saturated value; irradiation damages of seeds increase with ion dose;the free radical concentration decreases with the increase of moisture content in seeds; and free radicals in seeds decrease very slowly. The relation between free radicals and damages in seeds was discussed.  
          
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        发布时间：2021-04-09
      • Liu Nianqing Zhang Xiaofeng Yan Lingna Feng Songlin Zhong Ming
        Issue 4, (1992)
        摘要：The concentrations of Ti and .Ca, P, K, Fe, Cu, and Zn in blood samples were determined by PIXE after a single intravenous and a single oral dosing with titanium-ascorbate （Ti-Vc） in Wister rats. Following the intravenous injection with 50 mg Ti-Vc/kg of body weight the absorption, distribution and clearance in blood could be described by an exponential equation with three terms. After being gavaged with 500 mg Ti-Vc/kg of body weight, the content of Ti reached the highest level in 1.5h. The concentration of Ca was increasing with the absorption, distribution and clearance of Ti in blood, while the contents of Fe and K were decreasing. And the contents of Cu and Zn were significantly fluctuating. The effect of Ti on animal growth might be explained by the fact that Ti-Vc supplementation could promote the absorption of Ca.  
          
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        发布时间：2021-04-09
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