最新刊期
      卷 0 ， 期 0 ， 2020
      • Issue 9, (1999)
        摘要：600keV的荷能碳团族离子C+n（n=1─5）注入到NaCl单晶，当入射粒子的速度v大于玻尔速度v0（=c/137）时，能量转移主要是由入射粒子与靶原子的核外电子碰撞造成的。假定团簇中各原子的能量歧离大于它们的结合能时，团簇状态已经结束，各原子成为独立的粒子。利用Trim程序对碳团簇在NaCl单晶中的射程进行了模拟，得到团簇区域的长度为278－321nm，总射程为686nm。  
        关键词：Clusterion;Cluster zone   
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        发布时间：2021-03-12
      • Issue 9, (1999)
        摘要：The surface modification was studied for the ultra high molecular weightpolyethylene (UHMWPE) samples implanted by 80keV N2+ and C3H8+ ions withvarious doses. Elastic recoil detection (ERD) was used to measure the hydrogenprofiles in the samples. The KyowA’s DF-PM reciprocating tester was used tomeasure the wear quantity of the samples before and after implantation. The resultsshow that a hydrogen deficient surface layer has formed after implantati0n and thewear-resistance of the samples after implantation has been improved. Themechanism of the UHMWPE surface modification was discussed.  
        关键词：Ion implantation;Polyethylene;ERD;Wear   
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        发布时间：2021-03-12
      • Issue 9, (1999)
        摘要：The purpose of our work is to find a way for application of depleted uranium inCANDU reactor by using MOX nuclear fuel of depleted U and Pu instead of naturaIuranium. From preliminary evaluation and calculation, it was shown that MOXnuclear fuel consisting of depleted uranium enrichment tailings (0.25% 235U) andplutonium (their ratio 99.5%:0.5%) could replace natural uranium in CANDU reactorto sustain chain reaction. The prospects of application of depleted uranium in nuclearenergy field are also discussed.  
        关键词：Depleted uranium;MOX nuclear fuel;CANDU reactor;Fission amount;Burn-up;HWR;PWR   
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        <引用本文> <批量引用> 7199422 false
        发布时间：2021-03-12
      • Issue 9, (1999)
        摘要：A study on the effect of slotting technology and surface treatment upon energyresolution for BGO crystal array detector used in positron emission tomography-PETis described. Experimental results are also furnished in this paper.  
        关键词：BGO crystal;Detector;Energy resolution;PET   
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        <引用本文> <批量引用> 7199450 false
        发布时间：2021-03-12
      • Issue 9, (1999)
        摘要：Compositions of constant and trace elements in Dushan jade from Nanyang areaof Henan province were studied by PIXE and wet chemical analysis. A fingerprintelement Sr was ascertained to identify Dushan jade.  
        关键词：Dushan jade;PIXE analysis;Fingerprint element   
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        <引用本文> <批量引用> 7199177 false
        发布时间：2021-03-12
      • ZHOU Sichun
        Issue 9, (1999)
        摘要：Two kinds of portable XRF analyzer have been developed, 2 to 6 elements can bemeasured simultaneously in-situ. An XRF prospecting gold technique withmulti-parameter XRF analyzer has been developed, good gold prospecting effectshave been obtained in "Sanjiang", and "Jinsanjiao" areas of Sichun in China.  
        关键词：Portable multi-element XRF analyzer;Measuring multi parameters;Prospecting gold technique   
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        <引用本文> <批量引用> 7199152 false
        发布时间：2021-03-12
      • Issue 9, (1999)
        摘要：The CaF2:Mn thermoluminescent material and dosimeter were prepared, theirproperties including glow curve, dose response and energy response were studied. Itwas shown that CaF2:Mn material is suitable for measurement of absorbed dose for Sisemiconductor devices.  
        关键词：CaF2:Mn;Thermoluminescence;Dose   
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        <引用本文> <批量引用> 7199079 false
        发布时间：2021-03-12
      • ZHANG Caihong
        Issue 9, (1999)
        摘要：A method of uranium direct determination by laser induced fluroscence ispresented- The kinds of samples determined include surface water, soil, biologicalmaterial and some contaminated soils. Results show that the method is sensitive andaccurate, with degree of variation 5%, 10% and 20% for water, soil and biologicalsamples respectively. Results of inter-lab comparisions indicate that results from thismethod are of comparablity. Its high sensitivity and reliability, as well as itsconvemence and low cost will make this method a more attractive option forapplication to envirorunental monitoring.  
        关键词：Laser induced fluroscence;Uranium determination;Environmental samples   
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        发布时间：2021-03-12
      • Issue 9, (1999)
        摘要：Several special phenomena and problems occurred on SMCAMS during itsdevelopment, such as electric field penetration, the influence of vacuum condition onthe stability of transmission efficiency and the precision of isotopic ratiomeasurements, space charge effects and X ray backgrounds etc. were introduced inthis article. The solutions based on many observations and experiments have beenobtained within the last few years.  
        关键词：Electric field penetration;X ray background;Vacuum condition;Space charge effects   
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        <引用本文> <批量引用> 7199135 false
        发布时间：2021-03-12
      • Issue 9, (1999)
        摘要：The experiments on the secondary electrons and X rays induced by implantinglow energy γand X rays into Fe, Cu and Ta thin films with diffrent thickness havebeen performed. The affecting mechanism on the strength of secondary electrons andX rays has been discussed.  
        关键词：X ray;γ ray;Secondry radiation   
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        <引用本文> <批量引用> 7199165 false
        发布时间：2021-03-12
      • Issue 9, (1999)
        摘要：This paper describes the application of the multimedia technique inmeasurements of beam profile in the NSRL storage ring. It includes video capture,hoage processing, data processing and data logging. This software has a friendly userinterface and runs with a high stability.  
        关键词：eam profile;Video capture;Data collection;Data processing   
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        <引用本文> <批量引用> 7199111 false
        发布时间：2021-03-12
      • Issue 9, (1999)
        摘要：Deuterated tryptophan was prepared by simple exchange reactions in DC1 orD2O solution. The yield and abundance of deuterated tryptophan obtained from usingDC1 as the deuterium solute was 92% and 98.5% respectively, whereas that by usingD2O was 95% and 96.2% respectively. Deuterated perlolyrine was synthesizedstarting from deuterated tryptophan via acid-catalyzed ring-closure, aromatisationand hydrolysis, with a yield of 11.6% and abundance of about 95%. The labelledperlolyrine was suitable for studying drug metabolism.  
        关键词：Deuterated tryptophan;Deuterated perlolyrine;Synthesis   
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        <引用本文> <批量引用> 7199122 false
        发布时间：2021-03-12
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