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        科研成果报告

      • Yuming Liu,Yimei Xie,Deren Wang,Yonggen Yan,Yindi Shen,Meisheng Wu,Xun Xu,Yueqi Yang,Qinguo Xu,Lihua Zhang,Shuhua Li,Shicai Wang,Wenxiang Yang
        Vol. 10, Issue 6, (1987)
        摘要：A conversion rate of more than 90% was obtained in sensitized polymerization, and the output of radiation was double at a reduced total dose of 0.5 Mrad as compared to original 1 Mrad.The unpolymerized monomer could be removed simply by extraction under reduced pressure to save a large volume of organic solvent. The quota of raw material consumption would be reduced without influencing quality of the product.experiments indicated that the content of water in trioxane, even up to 300 ppm, has no effect on conversion о molecular weight. Irradiated trioxane was stored in dry air kept away from light at room temperature could effectively sustain the lifetime of active species even after a lapse of one month.The infrared spectrum, molecular weight distribution and physical mechanical properties of the product from sensitized radiation polymerization were identical with those of the unsensitized process.  
        关键词：sensitized radiation polymerization;solid trioxane;acetic;anhydride active species   
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        发布时间：2022-08-16
      • Changquan Shen,Peiruo Shen,Zongnan Ye,Renyong Yuan,Xiaonan Li
        Vol. 10, Issue 6, (1987)
        摘要：A high pressure xenon-filled muitiwire proportional chamber is described. It can be used as balloon-borne hard X-ray telescope or hard X-ray detector in other nuclear techniques over the energy range of 10 to 200 keV.It has a sensitive area of 700 cm2 with a filling gas of 95% Xe+5% CH4 at 3 atomospheres pressure. Its energy resolution (FWHM) for single anode is 10% for 59.5 keV (241Am radiation source) and 19% for 29.8 keV (the escape peak of 59.5 keV photons in xenon), and it becomes 17% and 20% respectively if all anodes are connected together. It can keep good energy resolution for three monthes after each gas purification.  
        关键词：X-ray;multiwire proportional chamber;xenon;high pressure   
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        发布时间：2022-08-16
      • Yinan Yang,Shaojin Yang,Bingru Chen,Qinfang Qian
        Vol. 10, Issue 6, (1987)
        摘要：In this paper, the concentrations of 39 elements in stack particulates with different sizes from two different types of boilers were determined by INAA. It is advantageous to find out and analyse the chief pollution sources, varieties and quantities of atomospheric particulates in the native region. This will help draw up the measures for prevention atmospheric pollution and provide necessary data in order to calculate the contribution rates of burning coal and oil to atmospheric particulates by acceptor mode.  
        关键词：Neutron activation analysis;stack particulates with different sizes;atmospheric pollution   
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        发布时间：2022-08-16
      • Jian Yuan,M. Morando
        Vol. 10, Issue 6, (1987)
        摘要：The program presented here is used to measure a series of the nuclear decay spectra after on beam time multiparameter event measurement based on PDP11/34 data acquisition system and transfer these spectra onto DISC of VAX11/780 through RSX DECnet during the experiment, data stored in file format are useful and reasonable for nuclear physicists.  
        关键词：nuclear decay spectra;on beam time;RSX DECnet   
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        发布时间：2022-08-16
      • Yunlong Qian,B. Laune,G. Derrig
        Vol. 10, Issue 6, (1987)
        摘要：The three gradient method for determination of beam emittance was described. The SEM multiwire devices set behind quadrupole or a pair of quadrupole magnets have been applied to measure the beam emittance. For obtaining better results the measured data were disposed mathematically with least square method. A computer program was written to obtain and display the beam emittance, related parameters as well as the beam ellipse. The beam emittance in both horizontal and vertical plane can be determined at same time by this method. The factors affecting the precision of measured results were discussed briefly in the paper.  
        关键词：Emittance;Beam profile;Quadrupole magnet;Least square method   
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        发布时间：2022-08-16
      • Yusheng Wang,Jianhua Yan,Shengnan Zheng,Shiduan Yin,Jingping Zhang,Quan Gu,Aiping Dai,Baozhen Xie,Shijie Liu
        Vol. 10, Issue 6, (1987)
        摘要：An experimental installation of channeling backscattering is described. Using channel backscattering method, study on the measurement of radiation defect, analysis of surface components, and analysis of the defect of foreign bosy extensional layer are carried out, and have achieved some results meaning full to semiconductor material technology and integrated circuit.  
        关键词：channel effect;measurement of radiation defect;analysis of surface component;analysis of the defect of foreign body extensional layer   
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        发布时间：2022-08-16
      • Guangsheng Li
        Vol. 10, Issue 6, (1987)
        摘要：A spectrum of gamma background has been investigated when in-beam measurement was performed with α-particles from the 1.2m cyclotron. Prominent peaks in the spectrum have been identified. These peaks result from inelastic neutron excitation of germanium isotopes in Ge (Li) detector and neutron reactions on these isotopes, as well as from reactions of incident α-particles in slit, collimator and beam collector. Method reducing the background has been discussed.  
        关键词：Cyclotron;in-beam measurements;gamma background   
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        发布时间：2022-08-16
      • Yanwu Dong,Qirong Zhou
        Vol. 10, Issue 6, (1987)
        摘要：This paper describes a sort of method measuring microquantitative U, Ra, Th, K in solid samples by low energy γ spectrometer and the measured results were given. The weight of sample is 20 grams. The lithology of sample and the effect of selfabsorption is negligible. The accuracy of the method is better than 15% for environmental samples. The detection limit of the method is 2.0×10-6g/g, 1.6×10-3g/g, 2.6×10-7g/g, 3.9× 10-3g/g for U, Ra, Th, K respectively. The results of measured realistic samples is satisfactory.  
        关键词：γ spectrometry;microquantitative analysis;uranium;radium;thorium;potassium   
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        发布时间：2022-08-16
      • Yuanxun Zhang,Mingyao Li,Yong Wu
        Vol. 10, Issue 6, (1987)
        摘要：This paper deals with further development and experimental testing of the advance prediction computer program (APCP) on PDP-11 computers. Experimental tests with three reference materials and predictions for reactor neutron activation analysis conditions are described. The program is extremely useful as a guide to optimum experimental conditions, sample sizes and detectable elements for any sample matrix of only appror ximately known major and minor elemental composition.  
        关键词：Neutron activation;Trace elements;Computer program   
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        发布时间：2022-08-16
      • Jianzhou Zhang,Fengxiang Li,Yitun Tian,Xiuhui Li
        Vol. 10, Issue 6, (1987)
        摘要：The purpose of this project is to study the application of sulfhydryl cotton to separate and concentrate Hg in cement.Four types of absorbent cotton were selected to prepare for sulfhydryl cotton, which are made in Beijing, Shanghai, Haerbin and Zhengzhou. In order to search for the best purgative way of purification of absorbent cotton, in the experiment different inorganic acides and organic reagents were used as detergent.The concentrated Hg in sulfhydryl cotton was irradiated in a reactor core and detected by a Ge (Li) detector.The detection limit of the method is about 0.004µgHg ml-1. The recovery rate of the mercury is about 100%.  
        关键词：sulfhydryl cotton;cement;Neutron activation analysis;Mercury   
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        发布时间：2022-08-16
      • Changsong Ji
        Vol. 10, Issue 6, (1987)
        摘要：A transportable meter for environment radon measurement with a 40 1 decay chamber is designed on the principle of thomas two-filter radon content absolute measurement. The sensitivity is 0.37 Bq.m-3 with 95% confidence level. This paper describes the experimental method of it's intrinsic uncertainty measurement. The typical intrinsic uncertainty (for n×3.7 Bq•m-3 radon concentration) is<10%. The parameter of exit filter efficiency is introduced into the formula, and the verification is done for the case when the diameter of the exit filter is much less than the inlet one.  
        关键词：environment radon;Two-filter method;absolute measurement of radon content   
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        发布时间：2022-08-16
      • Limin Zhang,Jie Sun,Delin Wu,Meiyu Qiang,Qi Chen
        Vol. 10, Issue 6, (1987)
        摘要：Radioiodinated labelling of superoxide dismutase was performed using the chloramine-T method. The product was separated from the mixture by Sephadex G-75 column chromatography using 0.05 mol potassium phosphate buffer (pH7.8). Specific activity and radiochemical purity of the product were 166kBq/µg and more than 99% respectively. Labelled antigen (the product) bound with antibody (>50%).  
        关键词：superoxide dismutase;radioiodinated labelling;Chloramine-T   
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        发布时间：2022-08-16
      • Huiyang Zhao,Quansheng Li,Liren Shao,Yuzhi Guo,Qinfang Kuang,Bin Lou,Ping Fang
        Vol. 10, Issue 6, (1987)
        摘要：This paper reports the study and preparation of 99mTc-hexakis (t-butylisonitrile) kit. The radiochemical purity was over 95%.15 cases were studied with kits, included normal control 3 cases, coronary artery disease 5 cases, aneurysm 2 cases, arrhythmia 3 cases, virus myocarditis 1 case, exudative percarditis 1 case.these indicated that 99mTc-TBI myocardial perfusion agent would be used effectively in detecting heart diseases.  
        关键词：99mTc-hexakis (t-butylisonitrile);Myocardial perfusion imaging agent   
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        发布时间：2022-08-16
      • Shoupeng Zhu,Siying Zheng,Chongdao Wang,Genfa Cao,Baofu Sun
        Vol. 10, Issue 6, (1987)
        摘要：Retention and transference of enriched uranium UO2F2 were observed after iv once 20 mg/kg and ip 15 mg/kg qd×3d to Wistar male rats. The dynamic retention of radioactivity in the body showed that enriched uranium UO2F2 was chiefly localized in kidney, and then in skeleton and liver. The activity of enriched uranium UO2F2 in skeleton rose steadily while the concentration in kidney and liver droped. It was concluded that the retention peculiarity of enriched uranium was equal to that of natural uranium.When enriched uranium UO2F2 was accumulated in organism, it caused chromosome aberration on bone marrow cells. Results indicated that the chromosome aberration rates were elevated when the dose of enriched uranium UO2F2 was increased, at the same time the cell division was depressed.  
        关键词：enriched uranium (UO2F2);bone marrow cells;retention;mutagenic effect   
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        发布时间：2022-08-16
      • Tiancheng Zhu
        Vol. 10, Issue 6, (1987)
        关键词：nuclepore filtration membrane;resistive pulse technique   
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        发布时间：2022-08-16
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