最新刊期
      卷 0 ， 期 0 ， 2020
      • Zheng Jian Bao Borong Cao Benhong
        Issue 7, (1992)
        摘要：This paper reviews briefly the chemistry and migration behaviour of radionuclides in geologic system related to the underground disposal of radioactive waste. Chemistry of ac-tinides in natural aquifers, migration behaviour of radionuclides and natural analogue study are mainly discussed.  
          
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        发布时间：2021-04-09
      • Wei Xinmiao Wu Zhihua
        Issue 7, (1992)
        摘要：With the method of projection, a two dimensional integral for sources detection efficiency is obtained, it is simple and suitable to calculate with numerical integration.  
          
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        发布时间：2021-04-09
      • Sheng Liren Lin Jinxin Qian Chunliang Gu Lianxue
        Issue 7, (1992)
        摘要：Multichannel analyzer （MCA） plays a very important role in the nuclear experiments and applications of nuclear techniques. Today most systems are based on microcomputer, and the software in most of these systems are written by assembly language. In this paper a software realization by the C language and the speciality of this C version in some aspects are discussed.  
          
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        发布时间：2021-04-09
      • Zeng Yiwei Wu Xiaosha Yan Xiaohua
        Issue 7, (1992)
        摘要：A series of SmTiFe11-xCox compounds, where X ranges from zero to five, have been studied by 57Fe Mossbauer spectroscopy, X ray diffraction, and related magnetic measurements. Random site occupation of Co atom occurs in SmTiFe11-xCoxwhen X≥1. The Co concentration dependence of the magnetic hyperfine field for the samples, SmTiFe11-x, and temperature dependence of the magnetic hyperfine field for SmTiFe are obtained.  
          
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        发布时间：2021-04-09
      • Wang Youtong
        Issue 7, (1992)
        摘要：Mossbauer spectra of hexanuclear iron-sulfur basket clusters （α）Fe6S6（PEt3）4（SR）2 and （b）Fe6S5（μ-Sph）（PBS3）4（Sph）2 have been measured. The data have been measured. The data have been fitted sucessfully with a least-squares fitting computer program. The Mossbauer parameters measured at 77K are as follows, for clusters （α） ,Fe1: 8=0. 458±0. 004mm/s,ΔEQ = 0. 805±0. 004mm/s, A = 63. 0±3%; Fe1 :δ=0. 286±0. 004mm/s, ΔEQ = 0. 849 ±0. 004mm/s,A = 37. 0±3%; and for clusters（b）,Fe1 : δ=0. 529±0. 004mm/s, ΔEQ = 0. 782±0. 004mm/s,A=68. 2±3% ; FeI:δ=0. 335±0. 004mm/s,ΔEQ = 0. 781±0. 004mm/s,A = 31. 8±3%. The isomer shifts δ are relative to α-Fe. Using an empirical formula of the iso-mer shift 8 and the mean oxidation states for Fe atoms in tetrahedron FeS4 δ=1.44-0. 43s, it can be deduced that for clusters（α） ,.FeI is in +2. 2 and Fe I in ±2. 6; and for clusters（b）, Fe I is in +2 and Fe I in +2. 5.  
          
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        发布时间：2021-04-09
      • Li Yang Cao Guohui Ma Ruzhang
        Issue 7, (1992)
        摘要：The 57Fe Mossbauer study on high-Tc superconducting phase of Fe-doped Bi-system is performed. The isomer shifts indicate that Fe ions occupying Cu square and pyramidal lattice sites are in the high-spin 3+ state. Considering the Bi-based high-Tc superconductor is an ionic crystal and using effective valence and point charge model, we calculate the electric field gradient on different Cu lattice sites occupied by Fe ions within a cluster containing 845 and 884 ions respectively. The calculated result is in agreement with that of the Mossbauer experiment.  
          
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        发布时间：2021-04-09
      • Weng Zhinong Zheng Yufang Yu Zhengfang
        Issue 7, (1992)
        摘要：The magnetic anisotropy and crystallization of amorphous Fe47Ni32V1.5Si6B13.5 alloy have been studied by Mossbauer spectroscopy, X-ray diffraction analysis （XRD） and differential thermal analysis （DTA）. It was found that when annealing temperature was above 375℃the magnetic anisotropies developed rapidly with an easy direction parallel to the ribbon plane. The bulk crystallization starts at 500℃ and some metastable crystalline phases were formed. At a higher temperature, one of metastable crystalline phases α-Fe （Ni） alloy disappeared first. The final products of crystallization were found to be some stable crystalline phases.  
          
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        发布时间：2021-04-09
      • Jin Tao Ma Zhongquan Guo Qi
        Issue 7, (1992)
        摘要：In this paper the effect of the iron ion implantation on the oxide surface and SiO2-Si interface of MOS structure was studied by X-ray photo-electron spectroscopy （XPS） , and the chemical states of compounds formed were examined. The results obtained show that in the surface layers of SiO2 the pure Si micro-regions are formed under the implantation and the interface thickness is almost doubled that leads to failure of MOS capacitors. The physical and chemical mechanisms of MOS structure change by Fe+ ion implantation are also discussed and analyzed.  
          
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        发布时间：2021-04-09
      • Zhu Xinfang Zhang Qi Rong Tingwen Wan Honghe Lin Senhao
        Issue 7, (1992)
        摘要：The kinetics of oxidation of two kinds of polyacetylene film （R - PA and N - PA） exposed to air at about 20℃ and 45% relative humidity have been established and the changes in the structure of R - PA film before and after ion implantation were examined by FTIR and ATR - FTIR spectroscopy. It was observed that IR spectra of implanted K+ion R - PA film is different from these of chemically doped and the radiation stability of cis -（R -PA） film is better than trans -（R -PA）. The relation between changes of the structure of surface layers during ion implantation for doping of polyacetylene and electrical properties have been discussed preliminarily.  
          
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        发布时间：2021-04-09
      • Luo Xiaobing Xia Yijun Long Xiangguan
        Issue 7, (1992)
        摘要：Based on the decay scheme, the formulas for calculating the correction factors of theγ-ray coincidence summing effects are deduced. The corrections for the coincidence of γ- rays with X-rays （from electron capture or internal conversition） and with annihilation quanta from positron decay are also discussed. The fullenergy -peak efficiency of the HPGe detector at defferent source - to - detector distance is calibrated by using the multi -γ- ray sources calibration method combined with the distance variation method with several single - γ- ray sources. The error of the efficiency is less than 3% at the energy range of 60 - 1116 keV. The peak -to -total ratio is determined for the single -γ-ray sources. The coincidence summing correction factors for Eu, Co and Na are calculated.  
          
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        发布时间：2021-04-09
      • Cheng Yulin Lin Junying Zhang Jiong Liu Guanfu Zheng Liping
        Issue 7, (1992)
        摘要：Mice with uranium administrated were dissected 0. 5h to 144h after the injection. The distribution and deposition of uranirm in kidney, lung, marrow, liver, heart, muscle and blood were studied using the fission track technique.Experimental results shown that trace uranium is deposited first in kidney and lung,then in marrow and liver. The uranium in the blood is transient so that blood - uranium level could not be used to estimate degree of uranium storage in the body.  
          
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        发布时间：2021-04-09
      • Ding Xingnong Zhu Jianhuan Yuan Xichuan Zhan Guoqing
        Issue 7, (1992)
        摘要：An intelligent reader used in routine dose measurement in radiation processing has been developed. Both radiochromic dye optical waveguide dosimeter and film dosimeter can be read accuratly, quickly and conviniently on this reader. The reader has been desiged with advanced dual -wavelength spectrophotometry. Single -chip micro -computer was used in data processing. The functions of this reader are equivalent, to both FWT -98 reader for radiochromic dye optical waveguide dosimeter and FWT -92 reader for radiochromic dye film dosimeter.  
          
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        发布时间：2021-04-09
      • Hou Hailin Zhu Liandi
        Issue 7, (1992)
        摘要：In this paper the radiometric properties of a silver dichromate dosimeter of grinding mouth glass bottle in the dose range of 0. 7 - 50 kGy are reported. Relation between absorbed dose （kGy） and net absorbance ΔA（ = Ao-Ai） is a second-order polynominal, polynominal constant does not depend on Ao. Temperature coefficient during measurement and irradiation, acidity affect of perchloric acid as well as dose rate effects in 22. 3 - 5400Gy/ h range and so on have been experimentally investigated. The applied range and total uncertainty of the dosimeter are discussed.  
          
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        发布时间：2021-04-09
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