最新刊期
      卷 0 ， 期 0 ， 2020
      • Chunyu Tan,Yueyuan Xia,Qingqian Liu,Jitian Liu,Chengrui Wang
        Vol. 06, Issue 4, (1983)
        摘要：RBS technique is used to study surface layer enrichment phenomena of Xe and Cs which are introduced in Si and A1 substrates respectively by means of ion implantation. The experimental results indicate that both Xe and Cs show remarkable outdiffusion behaviour and accumulate near the surface layer during annealing. However there is a definite difference between the diffusion phenomenon of Xe in Si and that of Cs in Al. Xe atoms accumulate near the surface of Si sample without any observable loss from the surface even if annealing is conducted at the temperature of 939℃. On the other hand, Cs atoms have a remakable release from the surface of A1 sample after 460℃ annealing. A possible mechanism of surface layer enrichment of implanted impurities is briefly discussed.  
          
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        发布时间：2022-08-16
      • Youlian Yang,Wenzi Wang,Dejun Zhou,Jinghai Sun,Jiaxu Zhao,Ciyu He
        Vol. 06, Issue 4, (1983)
        摘要：The configurations, principles of operation, applications and main features of both type ZTCo121 and type ZTCo122 cobalt SPNDs are described in this paper. Formulations are given for computing thermal neutron sensitivity, the correction of burn-up and the lifetime of these two types of SPNDs, and the values are calculated. The distribution of in-core axial neutron flux was mapped by ZTCo121 detectors. The results were compared with that mapped by copper foil activation procedure, and they were found to be in agreement with each other. Performance testing shows that the thermal neutron sensitivities are 1.6×10-22 and 2.66×10-22 A/nV.cm respectively; the measurement accuracies are both less than 3% and the high temperature insulation resistance is both higher than 108Ω.  
          
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        发布时间：2022-08-16
      • shenggang Li,Guanjun Yuan,Peikun Weng
        Vol. 06, Issue 4, (1983)
        摘要：For many years, the coicidence measurement techniques have often played an important role in the experiments of nuclear physics. Since the invention of the Ge(Li) detector, wihich has an excellent energy resolution and larger volume, the coincidence methods have greatly been improved. As the Ge(Li) detector has larger capacitance and small pulse-height and various rise time of pulse, its timing seems more difficult.A Ge(Li)-Ge(Li) list mode multiparameter system with the Scorpio-3000 multichannel computer system and two large Ge(Li) detectors (one is 130 cm3, the other 100 cm3) has been set up and adjusted.The system is capable of processing 1000 events/s and E-E-T analysis in 4096 × 4096 × 1024 channels. The play back sorting of a 2500 feet magnetic tape is completed in 90 minutes, and the work can be done with the same computer on the spot, The time resolution is 30 ns at 1.33 MeV γ ray and true/false coincidence ratio is 65:1.  
          
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        发布时间：2022-08-16
      • Weiqi Shen,Mingli Dong
        Vol. 06, Issue 4, (1983)
        摘要：In recent years, the study of more complicated hyperfine interactions, such as impurity-defect interaction in condensed matter, is rather interested. The partial amplitudes of some kind of specific perturbations are quite small as compared to the total. The exact extraction of them is difficult and depends critically on the characteristics of the spectrometere.g.differential linearity and time resolution.A rotational triple detector system has been built for both in-beam and off-beam experiments.The differential-nonlinearity in spectra is minimized through rotating the common start counter by 90° in successive measurement.Some special electronic treatment has been taken and the total time resolution of the fast-slow circuit proves to be better than 1.5ns.  
          
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        发布时间：2022-08-16
      • Jinqiang Xing,Xiamin Shi,Ronglin Shen,Yongshun Wu
        Vol. 06, Issue 4, (1983)
        摘要：The absolute efficiency of a 42cm3 coaxial Ge (Li) detector was measured in the energy region of 0.3MeV ~ 10MeV.The absolute efficiency curves of FEP and DEP at the source to detector distance of 10cm were calculated. Extrapolating this method and result to different source-detector distances were demonstrated. The functions of fitting the FEP and DEP curves and the expressions of FEP and DEP efficiency curves suited to this detector were checked.  
          
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        发布时间：2022-08-16
      • Tiaorong Zhang,Shouxin Chen,Zhiyi Zou,Chunchang Sun,Miao Chen,Jianming Huang
        Vol. 06, Issue 4, (1983)
        摘要：The principle and structure of the beam profile monitor and its experimental results on the ion source test bench are described. The magnetic-coupled static vacuum seal is used in the device to replace rotational vacuum seal. A 45° helix wire is used as a scanning probe. When the probe rotates a circle, the picture of the beam profile in two perpendicular directions is given, the position of the beam in the beam line and its intensity are also displayed. The dimensions of this device is 120mm in diameter and 180mm in length.  
          
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        发布时间：2022-08-16
      • Zhizhong Song,Renxing Li,Zhongyi Wang,Kui Zhao,Zhongxi Yuan
        Vol. 06, Issue 4, (1983)
        摘要：This paper describes a newly designed side extraction PIG ion source which possesses magnetic mirror field produced by a permanent magnet. The advantages of the source are: uncomplicated structure, light and handy, and low power dissipation. It also has the characters of larger densities of extracted beams and higher proportions of atomic and multiple charged ions. Under the condition of 50~150W arc power, 1.0 mA extracted beams were obtained for H, BF, and Ar, in which the proportions of H, N and B are 90%, 70%, 50% respectively. B, N, Ar are also observed.  
          
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        发布时间：2022-08-16
      • Chunlong Piao,Guifen Su,Anju Yao
        Vol. 06, Issue 4, (1983)
        摘要：It is demonstrated in this paper that it is also possible to obtain higher proton ratio in penning discharge of low pressure and low current. A penning ion source has been designed. It's outer diameter can be as small as 25mm; and it's proton ratio, as high as 30~50% under the pressure of 5×10-5 mmHg and in 200~400 μA discharge current. It meets pretty well the needs of small sealed-off neutron tube.It has been studied through experiments how the proton ratio is affected by some parameters, such as pressure, anode voltage, anode, diameter. magnetic field and recombination coefficient. An effective way has been found to raise the proton ratio. It is favourable for raising proton ratio to operate ion source at the upper limit of low pressure mode (~1×10-4 mmHg) , to increase the strength of magnetic field and at the same time, to reduce properly the diameter of anode cylinder.  
          
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        发布时间：2022-08-16
      • Jun Qian,Minhua Ni,Zhili Xu
        Vol. 06, Issue 4, (1983)
        摘要：Gaseous phase irradiation induced grafting copolymerization is an advanced new copolymerizing technique of radiation induced grafting.Gaseous phase grafting method with reflux monomers is adopted to research the pre-irradiated film of tetrafluoroethylene (TFE) -hexafluoropropylene (HFP) copolymers (F46) grafting copolymerization with styrene (St) -dual vinyl benzene (DVB) . It elaborates the transforming process of F46-St gaseous phase grafting. The obtained crosslinking and non-crosslinking F46 homogeneous ion exchaging membranes have excellent properties of antioxidation, anti-corrosion and ion selective penetration.The reaction period of this gaseous grafting method is shorter. its equipment is easy to operate, so this new gaseous grafting method is worth researching profoundly.  
          
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        发布时间：2022-08-16
      • Zhixian Zhao
        Vol. 06, Issue 4, (1983)
        摘要：The 60Co gamma-ray wool irradiation disintecfion facilities is described. It consists of a 150kCi plaque source, a storage pool and shielding, product handling areas, and a underslung conveyer system designed for either continuous or batch operation. The source intensity may eventually be increased to 500kCi. It was specially designed for irradiation steritization of wool packages with apparent density of 0.25 and the maximum overall size 100×80×50 cm. Other packed materials may also be irradiated with different doses accordingly. The ratio between the maximum and minimun doses is about 1.4. The annual capacity of treatment is about 3000T wool/100kCi 60Co.  
          
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        发布时间：2022-08-16
      • Shipeng He,Chenjiang Liu
        Vol. 06, Issue 4, (1983)
        摘要：The optimum conditions for liquid scintillation counting of 125I and the influences of scintillants and the fashions of measurement on counting were studied. Solid counting was used in 125I-TME-ScGMP RIA with millipore as supporter.  
          
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        发布时间：2022-08-16
      • Group for Neutron Measurement of Soil Moisture
        Vol. 06, Issue 4, (1983)
        摘要：In this paper, the fabrication and performance of the neutron moisture gauge for the exploration of the permafrost region are briefly presented. Its small size, light weight and low power consumption make the gauge portable and easy to operate in field survey.  
          
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        发布时间：2022-08-16
      • Liangming Wang
        Vol. 06, Issue 4, (1983)
        摘要：A method of accelerating H2+ and H3+ is described. The vacuum chamber of the magnetic analyzer is protected from bombardment of the beam by adding a fin made of red copper covered with a Ta foil. The beam trajectory in the magnetic analyzer system has been calculated.  
          
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        发布时间：2022-08-16
      • Yuzhang Liu,Junhao Yang
        Vol. 06, Issue 4, (1983)
        摘要：A method for the preparation of radium standard solution is described. It is based upon the equilibrium relationship between uranium and radium in the original pitchblende from which the standard is prepared.  
          
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        发布时间：2022-08-16
      • Zongzhi Huang,Qiying Fang,Hongdi Zhou
        Vol. 06, Issue 4, (1983)
        摘要：Medical isotope 123I can be produced with nuclear reaction of 123Sb (α, 2n) 123I. A method is for determining trace elements in target material Sb plate is described. The Sb plate were dissolved in the mixture of 6N HC1 and concentrated HNO3, then evaporated to fume and transformed into bromide by dissolving the residue in 8N HBr. Sb was extracted by shaking the mixture with 1N D2EHPA/n-Heptane and rejecting the organic layer, A1, Cd, Co, Pb and Te in aqueous phase were determined by ICP emission spectrometry with a sensitivities of from 6×10-6g to 1.25×10-7g, chemical yields of 82.0% to 95.0% and relative standard deviation of 8.2% to 19.5%.  
          
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        发布时间：2022-08-16
      • yun Jiang,Jindi Ni,Youdao Han
        Vol. 06, Issue 4, (1983)
        摘要：The paper reports the study on incineration of the absolute filter contaminated with radioisotopes. Large amount of waste absolute filter are produced in the field of nuclear industry every year. But their storage is very expensive. In this study it was treated by mixed incineration. This would solve the problem of adherence of fibre glass to the hearth, which spoils the equipment. at high temperature of combustion it would also reduce the storage cost. The experimental results show that there was about 96.8% reduction in volume of absolute filter and about 58.2% reduction in weight. The radioisotopes were enclosed into glass. Hence, such incineration method would be of significance for safe storage and economical management.  
          
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        发布时间：2022-08-16
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