最新刊期
      卷 0 ， 期 0 ， 2020
      • Issue 1, (1996)
        摘要：The occurence state of platinum in Xinjie Pt mineral deposit, Sichuan Province has been studied with. neutron activation analysis（NAA） and scanning proton microprobe（SPM）. Platinum ore samples from the deposit were analyzed by NAA to understand mineralising features of PGE. Then the SPM was used to get microarea distributing features of platinum for the samples. It is shown that Xinjie Pt deposit is of rich Pt-Pd type where spenylite,occuring independently in the deposit, is one of major occurence states of platinum.  
        关键词：Scanning proton microprobe;Neutron activation analysis;Platinum mineral deposit   
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        发布时间：2021-04-09
      • Issue 1, (1996)
        摘要：A β ray telescope has been made with a thin plastic scintillator, a thick BaF2 crystal and an RCA 8850 photomultiplier. Measurements of a 90Sr-90Y β ray source together with a 22Na γ ray source show that this telescope can record a fairly good β spectrum of 90Sr and reduce interference of γ rays from 22Na by more than 97%.  
        关键词：Plastic scintillator;BaF2 crystal;β ray measurement   
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        发布时间：2021-04-09
      • Issue 1, (1996)
        摘要：The radiation effects and damage properties of bipolar operational amplifier OP-07 exposed to protons with energies of 12 MeV and 8MeV are investigated. It is shown that the gain reduction of transistors in the circuit is the primary reason for the degradation of the device due to both displacement damage and ionizing damage,and the effects are proportional to flux and energy of the incident protons.  
        关键词：Protons;Radiation effects;Operational amplifier;Gain degradation   
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        发布时间：2021-04-09
      • Issue 1, (1996)
        摘要：Some typical image edge detection methods are reviewed. Then a heuristic image edge detection algorithm is presented and an experiment upon two images is carried out. Compared with the previous methods, this new technique demonstrates a better quality, especially the ability of extracting the object image edge from the background.  
        关键词：Edge detection;Gradient operator;Heuristic seeking method   
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        发布时间：2021-04-09
      • Issue 1, (1996)
        摘要：After establishing the immuno-cytochemical staining technique of cell samples suitable for soft X-ray contact microscopy（SXCM）, the HLA-A2 surface antigens of cultured Hep-2 tumor cells were labelled by immunogold silver staining（IGSS） and detected by SXCM. The resultS reveal that the immunogold silver granules on the surface of Hep-2 tumor cells have sharp contrast and show stereo features, and the granules with different sizes and shapes can be clearly seen and easily identified.  
        关键词：Soft X-ray contact microscopy;Tumor cell;Immunogold silver staining;Surface antigen   
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        发布时间：2021-04-09
      • Issue 1, (1996)
        摘要：The iron availability from plant food influenced by fat, vitamin, zinc and calcium has been studied using an in vitro method with the combination of 59Fe radioisotopic tracing. It can be concluded that the rational ingredients of meal is a key link in enhancing the bioavailability of nonheme iron in food, such as vitamin C and moderate amount of cooking oil is favourable to iron absorption and the intensified food rich in zinc and calcium seems to inhibit the iron availability.  
        关键词：In vitro method;Radioisotopic tracing;Iron availability   
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        发布时间：2021-04-09
      • Issue 1, (1996)
        摘要：A new data processing system used in radioimmunoassay is reported. Based on the latest mathematical model recommended by WHO, the system includes 4- and 5-parametey logistic models and 4-parameter single binding site mass action model.A new approach tO the curve fitting of RIA has been developed based on the combination of the direct searching in the optimization method and the traditional non-linear regression. The system also possesses perfect quality controling and database function .  
        关键词：Radioimmunoassay;Optimization method;Non-linear regression;5-parameter logistic model   
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        发布时间：2021-04-09
      • Issue 1, (1996)
        摘要：第二届“王淦昌优秀核科学和核技术论文奖”评定揭晓第二届“王淦昌优秀核科学和核技术论文奖”是评选１９９２年和１９９３年两年发表在《核技术》和“ＮｕｃｌｅａｒＳｃｉｅｎｃｅａｎｄＴｅｃｈｎｉｑｕｅｓ”上的优秀论文．经全体评委初评及评委常委复评，再经评委主...  
          
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        发布时间：2021-04-09
      • Li Guangzao
        Issue 1, (1996)
        摘要：Measurement and calculation results of air absorbed dose rate in γ field of a 60Co room are reported. The derivation of the calculation method is introduced and the related formulas presented. The statistical test indicates that the air absorbed dose rate in γ field of a 60Co room follows the lognormal distribution, and there is no signilicat dchrence between geometric averages of the calculation and the measured values（P>0.05）.  
        关键词：﨏o room;γ ray air absorbed dose rate   
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        发布时间：2021-04-09
      • Issue 1, (1996)
        摘要：Matters which are worthy of attention in the welding of NYZ medical accelerating tube are described. The accelerating tube should be divided into many parts to be welded according to the welding facility. The weld seams between parts,as far as possible, should be chosen near the observation windows and far away from the low temperature sections of the hydrogen stove. Weld interfaces must contact well each other during assembling, and remain perpendicular to the vertical line to minimize deform and displacement between rings and plates during sling and to assure tightness of seams. Before the short parts and the whole accelerating tube are sent into the stove and after welded, the straightness of assembling must be checked.  
        关键词：Accelerating tube;Weld technology;Mechanical error;Leak rate   
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        发布时间：2021-04-09
      • Issue 1, (1996)
        摘要：Amorphization of yttrium iron garnet （YIG）Y3Fe5O12 induced by the irradiation of 960 MeV Ar ions at 195±0.1K has been investigated by means of the sample-tilting X-ray diffraction（STD） and the saturation magnetization measurement. It is indicated that the transformation of crystalline tO amorphous state is a gradual process in which the electronic stopping power S. plays a dominant role,and a certain dose is necessary. A nearly complete amorphous state was observed at Se= 8.3MeV/μ m.  
        关键词：Amorphization;Yttrium iron garnet;Argon ions   
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        发布时间：2021-04-09
      • Issue 1, (1996)
        摘要：It is suggested in the paper that the Bragg peak of a heavy ion beam may be a useful means for investigating the site-chosen mutation. The principle and an experimental setup for measuring the Bragg Peak of heavy inn beam are described.After different materials were normalized to wheat material according to density, the Bragg peak location of 14N7+ ion beam with initial energy of about 50 MeV/u in wheat material was determined using twin ionization chambers. A depth of about 4.85mm for the peak location and a maximum range of about 5.5mm for the ion beam were finally obtained.  
        关键词：Heavy ion beam;Bragg peak;Ionization chamber;Site-chosen mutation   
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        发布时间：2021-04-09
      • Issue 1, (1996)
        摘要：Kapton films have been modified by ion implantation. Ions of N+, Ar+ and Fg+with energy of 120keV and doses ranging from 5 × 1014 to 1 × 1017 ions/cm2 were used to the implantation . The sheet resistivity and optical absorption of modified samples were measured. Electrical conductivity of pristine has been greatly enhanced after the ion implantation . The surface microscopic structure and compositional changes that accompanied these electrical enhancements were observed using X-ray photoemission spectroscopy （XPS） and Rutherford backscattering spectroscopy（RBS）.The effect of electronic excitation energy loss on molecular degradation induced by inn irradiation was Peeved to plsy an important role.  
        关键词：Ion irradiation;Polymer degradation;Energy deposition   
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        发布时间：2021-04-09
      • Issue 1, (1996)
        摘要：An intelligent radiation dosimeter, with such functions as signal collection and data processing , store, print and display, has been developed. Its detector is made of a microsenuconductor. This dosimeter can be used in laboratories for agricultural 60Co irradiators, radiotherapeutic facilities and other small and medium-size 60Coirradiators.  
        关键词：Dosimeter;Microsemiconductor detector;(60)￣Co irradiator   
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        发布时间：2021-04-09
      • Issue 1, (1996)
        摘要：Helium bubbles in 316L stainless steel irradiated with He+at 600℃ were investigated with TEM. Helium bubbles are formed preferentially at dislocation lines where helium concentration is low. As helium concentration increases, bubbles distribute homogeneously in the matrix. Bubbles are faceted both on grain boundary and in matrix, but bubble do not grow preferentially on the investigated grain boundary. Helium bubbles’ size and density were measured along the penetrating depth. With the help of u fluid mode", helium depth distribution in visible bubbles were calculated with the measured bubble size and density. It is found that the depth distribution of helium in visible bubbles shifts to the surface as compared with the helium concentration calculated with TRIM code. Implanted helium is mostly confined to the visible bubbles.  
        关键词：Helium ion irradiation;Helitum bubbles;Helium capture   
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        发布时间：2021-04-09
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