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      • Yonghui Qin
        Vol. 11, Issue 6, (1988)
        摘要：The recent advances on pre-concentration of trace components for neutron activation analysis are reviewed.  
        关键词：pre-concentration before irradiation;Neutron activation analysis;freeze drying method;absorptive method;extraction method;codeposition method;fire assay method   
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        发布时间：2022-09-13
      • Ruiying Yang,Zhongxiang Huang,Kainian Huang,Bingguang Liu,Di Liu
        Vol. 11, Issue 6, (1988)
        摘要：The Emeishan Basalt is distributed in the southwestern part of China. Based on the tectonic setting and petrochemistry, it can be divided into three petrobelts, i. e. the western, central and eastern, with the Jingho-Bingchun and Ganlo-Kunming abyssal fracture zones roughly being the boundaries between them.The samples studied in this paper were collected from the representative sections of the petrobelts described above, Rare earths (REE), transition metals (TME) and large ion lithophile elements (LILE) were determined by instrumental neutron activation analysis. The abundances of LILE intermediate between those of continental tholeiites and alkali basalts. The REE patterns of the basalt samples are LREE enriched type, the degree of enrichment varies with the sampling locations. The more west the sampling location, the less enriched the degree is. Based on the (Ce/Yb) CN Vs. CeCN plot, it can be inferred that the basalts in the central and eastern petrobelts might be formed through about 5% partial melting of garnet lherzolite while those in the western petrobelt might be due to about 10% partial melting. According to the La/Sm-La figure, it was shown that the formation of the basalt from the western petrobelt was significantly controlled by the degree of partial melting and that fractional crystallization had played an important role in the petrogenesis of the central and eastern petrobelts.  
        关键词：Basalt;partial melting;fractional crystallization;compatible elements;large ion lithophile elements   
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        发布时间：2022-09-13
      • Yunlong Qian,G. Derrig,B. Laune,D. May
        Vol. 11, Issue 6, (1988)
        摘要：The measurements of vertical behaviour of the beam extracted from AVF cyclotron with a SEM multiwire beam profile monitor are reported. The influence of circular trim coil current variation on vertical beam behaviour is also determined experimentally. The results show that the variation of trim coil current has greater influence on the vertical beam emittance than on the beam center displacement in the vertical direction.  
        关键词：circular trim coil;extracted beam;multiwire beam profile monitor;beam emittance   
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        发布时间：2022-09-13
      • Xiangtai Huang,Lingen Huang
        Vol. 11, Issue 6, (1988)
        摘要：The technique of kryptonation combined with autoradiography, being used in failure analysis of the works, is described. It offers an extremely sensitive method of displaying microdamages on surface and in subsurface. The advantages of this technique are high sensitivity, which enables the surface microcracks to be revealed with the opening width as fine as 0.05µm, and the possibility of nondestructively detecting subsurface microdamages.It is likely much better than other methods.  
        关键词：kryptonation;autoradiography;failure analysis   
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        发布时间：2022-09-13
      • Deredi Ku,Biao Liu
        Vol. 11, Issue 6, (1988)
        摘要：The change of 131I content in sheep-tissue in Xinjiang after the accident at Chernoby USSR was studied with a radiochemical method. The results showed that 131I level was increased from 7th May in sheep-tissue and reached its maximum on 20th May in thyroid. The effective half-life of 131I in thyroid, blood, muscle and contents in stomach were 7.2d, 6.7d, 6.7d and 5.1d respectively. The specific activities of 131I in grass, thyroid, blood, muscle and contents in stomach showed linear correlations.The 131I content in thyroid for the folded sheep was only 1.7 percent of that for the grazed sheep during the polluting period. The effective dose equivalence for adult to the 131I release from Chernobyl was 14.0 µSv in Urumqi and 3.8 µSv in Xinjiang.  
        关键词：accident release;131I;activity;effective half life;effective dose equivalence;folded sheep;grazed sheep;thyroid;muscle;blood   
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        发布时间：2022-09-13
      • Chuanshan Wang,Muyao Zhou,Kuanzhong Xie
        Vol. 11, Issue 6, (1988)
        摘要：Calculation of (n, 2n) and (n, 3n) excitation functions for 13 nonfissionable heavy nuclides of A>169, of which the compound-nucleus decay is without branching ratio, has been made based on the experimental values of σ (n,2n) for 14 MeV fast neutron using the compound-nucleus model.The results have been compared with the experimental excitation functions. The reliability and the reasonableness of the computation are discussed.  
        关键词：Neutron;(n,2n) reaction;(n, 3n) reaction;excitation function;compound-nucleus mechanism   
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        发布时间：2022-09-13
      • Shiming Wang,Gonggui Ma,Haishan Xu
        Vol. 11, Issue 6, (1988)
        摘要：With the Monte Carlo method, the gamma-ray detection efficiency of a large liquid scintillation counter and the correction for neutron multiple scattering in the sample have been calculated. Some results and discussion are given.  
        关键词：radiative capture;correction for multiple;scattering large liquid scintillation counter;Monte Carlo method   
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        发布时间：2022-09-13
      • Yonghua Wu,Xiaoyu Duan,Li Ding,Huhou Li
        Vol. 11, Issue 6, (1988)
        摘要：In this paper, we describe the Mössbauer spectra of 119Sn for a bronze mirror of the Han Dynasty. A method of measuring Mössbauer spectrum without sampling is established. For the sake of contrast, we measured both the spectra of transmission and of γ-ray scattering. The results show that on the surface of the bronze mirror Tin is in the state of Sn4+ oxide.  
        关键词：ancient bronze mirror;Non-destructive testing;Mossbauer spectroscopy   
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        发布时间：2022-09-13
      • Manyun Zhao,Yongchang Wang,Xiaoduo Zhao
        Vol. 11, Issue 6, (1988)
        摘要：The radiation-polymerization of hydroxyethyl methacrylate (HEMA) was described, including conditions of radiation-polymerization, such as irradiation dose, dose rate and atmosphere of irradiation. The experimental results showed that radiation-polymerization is simpler and easier to control than chemical methods. The hydrogels prepared by radiation-polymerization have good optical property and oxygen permeability. The materials are suitable for making soft contact lens and drug release matrix.  
        关键词：Hydrogel;Radiation;lens;Release;hydroxyethyl methacrylate   
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        发布时间：2022-09-13
      • Kuidong Zhao,Ruihua Xi,Yueming Chen
        Vol. 11, Issue 6, (1988)
        摘要：The properties of a novel scintillator PMP (1-phenyl-3-mesityl-2-pyrazolion) are described and a comparison is made with other ordinary scintillators. Some results on the use of PMP as a primary solute in liquid scintillation counting for α-emitters are also reported.  
        关键词：Liquid scintillation counting;scintillators;PMP   
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        发布时间：2022-09-13
      • Hailin Hou,Dong Cai,Xianglin Yu
        Vol. 11, Issue 6, (1988)
        摘要：The procedure for measuring activity of intense 60Co elements in Shanghai Irradiation Base and the benefits thus brought in are described. The determination of build-up factor Bγ is also presented. Two methods using under-water and over-water ionization chambers respectively are compared and the former is found to be more accurate.  
        关键词：60Co source element;Activity;Ionization chamber;build-up factor   
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        发布时间：2022-09-13
      • Kangchu Huang,Chengmo Zhu,Min Zhang,Jianhua Wu,Shuying Lin,Jianhua Zhang,Lansheng Gong
        Vol. 11, Issue 6, (1988)
        摘要：By using an anticoincidence unit to cutoff the interference of pacing pulses, an EKG and phonocardiography (PCG) triggered gate circuit for atrial pacing per esophagus was made for RNA.According to the criteria of Tzivoni, when the pacing heart rate was increased by gradation to 140/min or submaximal heart rate, it was found that in CAD patient there was a decreased EF value after pacing, and that in AMI patient decreased even lower and paradox movement of the ventricular wall was seen. Therefore, RNA by atrial pacing is useful for diagnosis of CAD, especially AMI.  
        关键词：anticoincidence circuit;gate circuit;atrial pacing per esophagus;coronary artery;disease (CAD);acute myocardial infarction (AMI);radionuclide angiocardiography (RNA)   
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        发布时间：2022-09-13
      • Guoping Feng,Ningyu Yi,Zongqin Xia
        Vol. 11, Issue 6, (1988)
        摘要：The experimental conditions in binding assay of beta-adrenergic receptor with 3H-dihydroalprenolol (3H-DHA) were studied. The buffer medium, the membrane preparation, the influence of protein quantity, the separation of bound/free radioligand and the source of nonspecific binding were investigated. An improved procedure was given and its specificity and stability proved quite satisfactory.  
        关键词：β-adrenergic receptor;receptor binding assay   
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        发布时间：2022-09-13
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