最新刊期
      卷 0 ， 期 0 ， 2020
      • Xianguan Long,Minghua Wang,Fuqing He,Xiufeng Peng
        Vol. 07, Issue 1, (1984)
        摘要：Using static moliere continuum potential for isolated plan and taking into account the effect of several adjacent plans, we have calculated the half-angular width and yields minimum of channeling dip for ‹100›, ‹110› and ‹111› plans in single crystal Si and compared with the experimental results of 1-MeV proton on Si. Both theoretical analysis and experimental measurement indicate that there is only one dip for ‹111› planar channeling, even if there are two different interplanar spacings for the ‹111› plans in Si.  
        关键词：Single crystal silicon;planar channel effect;continuum potential   
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        发布时间：2022-09-13
      • Huaian Zhu,Cihua Li,Yulan Jiang,Xilin Yin
        Vol. 07, Issue 1, (1984)
        摘要：The ND-A nuclear earth base densimeter is a precise instrument which can be used to measure the earth base wet density rapidly and non-destructively with measuring errors within±1%.  
        关键词：Earth base density gage;compactness;wet density;fast test;correletion coefficien calibration;calibration curve;Soil   
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        发布时间：2022-09-13
      • Zhifen Chen,Enteng Zou
        Vol. 07, Issue 1, (1984)
        摘要：A characteristic-scatter balanced filler is described here. It can be used when the absorbed effect on Sn KαX finds expression in multimetallic mineral. The principles of characteristic-scatter balanced filter, the treatment procedure of the filter's shape and test measurement on the sample of nature powder are given. The rate of qualification is better than 85%.  
        关键词：characteristic-scatter ballanced method;effect of base;measurement   
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        发布时间：2022-09-13
      • Liudong Xue,Zhongming Liu,Weinan Zhou,Lianfan Liu,Miaojun Hu
        Vol. 07, Issue 1, (1984)
        摘要：Mössbauer spectrometers are usually used in time mode. Because of the deadtime required to address each pulse into memory, the main disadvantage of this method is the restriction in vibrator frequency. A brief introduction of the Mössbauer spectrometer in pulse height modulation mode is given in this paper. It can be used up to 10~100kHz.  
        关键词：modulation mode;time mode;deadtime   
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        发布时间：2022-09-13
      • Linzhou Wang,Lili Li
        Vol. 07, Issue 1, (1984)
        摘要：A model of the proportional chamber for use in shower counters is described. The properties of CH4/Ar and CO2/Ar for use in proportional chamber have been studied. The gas multiplication and energy resolution have been investigated as a function of the gas mixture and wire diameter for 55Fe X-rays. And the plateau characteristics of the proportional chambers are reported as a function of the gas mixture.An explanation of the double peaks in 55Fe X-rays spectrum is qiven, which is different from reference[4].  
        关键词：proportional chambers;gas amplification factor;energy resolution;plateau characteristic;shower counter   
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        发布时间：2022-09-13
      • Mingjun Wang,Liejun Ma,Fangyu Li
        Vol. 07, Issue 1, (1984)
        摘要：The radiation induced crosslinking of SR is investigated under the different experimental conditions. The values of various crosslinking parameters have been calculated. By comparing variation of these parameter values the effects of filler, sidegroups, medium and MW on the radiation crosslinking are discussed. The results are as follows.The rate of gel formation is increased with methyl-vinyl siloxane chain in DMSR and Rg while it is decreased with phenyl-group. SR can be crosslinked at low dose with the fumed silica. This experimental result shows that the fumed silica is a sensitizer. The effects of mediums on crosslinking parameters of SR are CO2>N2>air>O2, but the difference is very small. Therefore the radiation crosslinking of SR in air is practical. In this work, the effect of MW on the Gcross value is given by the following equation:where Gi is the limiting value of Gcross at infinity of MW.  
        关键词：crosslinking parameter;silicone rubber;side-group;fumed silica;sensitizer;Molecular weight;nitrogen;carban dioxide   
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        发布时间：2022-09-13
      • Zongyang Wang,Xingying Yu,Yinchun Liang
        Vol. 07, Issue 1, (1984)
        摘要：The graft copolymerization of acrylic acid with polyvinyl fluoride (PVF) film by simultaneous irradiation with 60Co γ-ray source was studied. The effects of dose, dose rate, monomer concentration, temperature, Mohr's salt, inorganic acids, film thickness and solvents on graft copolymerization were illustrated. From the Arrhenius curve for the grafting of acrylic acid with PVF, the overall activation energy for this system was 5.8kcal/mol. The relationship between the grafting rate and film thickness is of minus one-order function which shows that the process of graft copolymerization is controlled by the diffusion. The infra-red absorption spectra of the graft copolymer shows strong absorption at 1580~1540cm-1 and 3590~3420cm-1, corresponding to the C=O and H—O contribution carboxyl group in grafted polyacrylic acid.  
        关键词：radiation-induced graft copolymerization;polyvinyl fluoride;acrylic;acid activation energy   
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        发布时间：2022-09-13
      • Houren Hu,Jianda Hu,Zhicheng Xu
        Vol. 07, Issue 1, (1984)
        摘要：The far infrared evaporation technology for treatment of lower-middle level radioactive waste liquid was investigated. The effects of the heater, distance, negative pressure and pH on cleaning factors of nuclides (137Cs, 90Sr, 147Pm, 95Zr-95Nb) and evaporaton rate were examined. About 0.7 tons of the medium liquid waste was treated; radioactive concentration of the condensate was 1×10-9Ci/l. The concentration factor was 35; resulted residue was in semi-solid state needing further solidification.  
        关键词：waste treatment;far infrared evaporation   
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        发布时间：2022-09-13
      • Wen Zhu,Weiyi Li,Weimin Bao,Zongqin Xia
        Vol. 07, Issue 1, (1984)
        摘要：M-receptors in crude membrane preparations of pooled cardiac muscle of ICR mice were estimated by radioligand binding assay with 3H-QNB as the labeled ligand. Each incubation tube contained 2ml. Na-K phosphate buffer (pH7.4). 0.8mg membrane protein, and various amount of 3H-QNB. The incubation time was 30min. The bound fraction was filtered onto a glass fiber filter disc (Type 79, manufactured in Shanghai), 0.01µM QNB was used to estimate the non-specific binding. Scatchard plot analysis of the data obtained from 4 experiments gave a KD value of 0.0918±0.0136nM. The maxium binding capacity, the QNB dose of 50% replacement, the association rate constant and dissociation rate constant and the t1 of dissociation due to QNB were also estimated.  
        关键词：M-muscarinic receptor;radioligand binding assay of receptors;KD——equilibrium dissociation constant;Bmаx——maximum binding capicity   
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        发布时间：2022-09-13
      • Yinlin Xu,Zhenghai Gu,Ping Xie
        Vol. 07, Issue 1, (1984)
        摘要：The characteristic atomic fluorescent radiations from Be, B, C etc. with the energies covering the range of 0.1 to 2keV can be detected by the thin window gas flow proportional counter. The performance and the results measured are given with some discussion.  
        关键词：Soft X-ray;thin window gas flow proportional counter   
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        发布时间：2022-09-13
      • Zhi Lu,Lingqi Kong,Xiuzhi Niu,Fengqin Xia
        Vol. 07, Issue 1, (1984)
        摘要：This paper describes a scintillation detecting technique with high counting rate and without fatigue. With the counting rate being about 105 pulses per second and the measuring time being 100 seconds or 500 seconds, the long term stability of the measuring system is 3.2×10-4 and 1.6×10-4 respectively. This technique has been used in the FT-1 gauge for measuring sediment concentration and so on.In practical application from 1978 to 1982, it is proved that the scintillation system has high counting rate, high precision and high stability in performance.  
        关键词：scintillation detecting technique;high precision long term stability   
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        发布时间：2022-09-13
      • Shaoyi Song,Huantie Li,Junguang Lu,Xiaowei Tang
        Vol. 07, Issue 1, (1984)
        摘要：Radioactivity in the manganese nodules from bottom of Pacific Ocean was measured. uranium and thorium were found in those nodules.  
        关键词：manganese;nodule;radioactivity;NaI (Tl) gamma-ray;scintillation;spectrometer;energy-spectrum analysis;uranium;thorium   
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        发布时间：2022-09-13
      • Wenmin Wang,Junheng Wu,Darning Zhang
        Vol. 07, Issue 1, (1984)
        摘要：120keV argon ion beams have been used to bombard thin Mo films evaporated onto silicon foil. The phenomena of the recoil implantation of Mo atoms into silicon have been investigated by RBS. Experimental results show that about 1.44 Mo atoms are recoil-implanted into silicon for each Ar ion.  
        关键词：Ion beam mixing   
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        发布时间：2022-09-13
      • Lanping Yang,Jiexi Lu
        Vol. 07, Issue 1, (1984)
        摘要：The dimethyl formamide (DMF)-sodium hydroxide mixture used as electrolyte for radioelectrophoretic study of iodide, iodate and periodate was described. The electrophoretic voltage and time related to ion migrating distance were selected. The concentration of sodium hydroxide in the electrolyte was varied. The electrophoretic behavious of iodide, iodate and periodate in various proportions of dimethyl formamide and sodium hydroxide was studied. The experimental conditions are as follows: voltage: 4000~5000V, time: 15min, concentration of sodium hydroxide: 0.1~0.5N, proportion of dimethyl formamide to sodium hydroxide: 1:1~1:3. In these experimental conditions, iodide, iodate, periodate can be very well separated. This mixed solution can also be used for paper chromatography.  
        关键词：iodide-125;periodate-125;radioelectrophoresis;paper chromatography   
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        发布时间：2022-09-13
      • Fang Niu,Zhongyang Wang,Wo Fan,Bingchen Xu,Weicheng Zhang
        Vol. 07, Issue 1, (1984)
        摘要：This paper describes the process of producing carrier-free radioisotope 109Cd via 109Ag (d,2n) 109Cd reaction on 1.5m cyclotron. 109Cd products of high purity have been obtained by anion-exchange method in HBr system. The chemical recovery ratio is about 99%. The products have been used as X-ray fluorescent sources in mineral analysis and oil industry.  
          
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        发布时间：2022-09-13
      • Zhili Wu,Xinwei Chen
        Vol. 07, Issue 1, (1984)
        摘要：This paper gives the more correct ε (Fe3+) value in our working conditions by investigation of the effects of residual H2O2 in Fe3+ solution and the difference in spectropho-tometric performance on ε (Fe3+) value determination. A method is proposed to calculate absorbed dose D751 through normalization factor K of ε (Fe3+) value.  
        关键词：determination of the ε (Fe3+) value;normalization factor K;calculation of the absorbed dose D751   
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        发布时间：2022-09-13
      • Hongjin Pan,Jinyi Rui
        Vol. 07, Issue 1, (1984)
        摘要：The effects of 14MeV neutron irradiation on light emitting diodes have been studied. If the voltage or current remains constant, the light intensity of LED decreases with the increase of neutron fluence.The experiment has also proved that 14MeV neutron irradiation can induce a non-adialive recombination center in LED and the light intensity is controlled by diffusive current.  
        关键词：Neutron irradiation;light emitting diode   
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        发布时间：2022-09-13
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