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        研究论文

      • Wenxiang Hu,Guilin Zhang,Lianfan Liu,Jiahua Wang,Weinan Zhou
        Vol. 12, Issue 1, (1989)
        摘要：Pure iron foils were implanted with Fe ions of 27 keV at the range of doses from 2×1016 to 5×1016 ions/cm2. The damage structure was observed by CEMS. The results show that there are three sites: Fe atom without surrounding vacancy, Fe atom associated with one vacancy, and with two or more vacancies. The temperature and the migration energy of monovacancy were estimated to be about 100℃ and 0.9 eV, respectively. The vacancy thermal release energy was 1.1eV.  
        关键词：α-Fe;Self-implantation;Damage structure;Monovacancy move;CEMS   
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        发布时间：2022-08-16
      • Jingcheng Wang,Guiying Qin,Zichang Shao,Fushi Chen
        Vol. 12, Issue 1, (1989)
        摘要：Measurements of S-lineshape parameter of Doppler-broadening spectra of positron annihilation were carried out during martensite (Fe-Ni) and thermoelastic martensite (Ti-Ni, Cu-Zn-Al) transformations. The data are useful to explain the difference between martensite and thermoelastic martensite transformation, the change of defects during transformation, the premonitory effect and the shape memory effect.  
        关键词：Positron annihilation;Martensite transformation;Thermoelastic martensite transformation   
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        发布时间：2022-08-16
      • Xianjia Pan,Guoqiao Jin,Zhongtian Sun
        Vol. 12, Issue 1, (1989)
        摘要：It is of important scientific value in archaeology to study the age effect with Mössbauer effect. 13 samples of ancient pottery from different excavated places and with different technology of production have been measured by transmission Mössbauer technique at room temperature. The experimental results show that the paramagnetic Fe2+ Q.S. values for 11 samples linearly increase with the age of pottery and that the mangnetic component of pottery with very old age almost disappears.  
        关键词：Ancient potsherd;dating effect;Mossbauer spectra   
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        发布时间：2022-08-16
      • Keyong Luo
        Vol. 12, Issue 1, (1989)
        摘要：The Fermi age and diffusion theory modeling is applied to study detection mechanism of a subsurface neutron soil moisture meter with a Li-glass scintillation probe. It is found that when the distance between the scintillator and the source is fixed, the thermal neutron counts given by the detector are mainly due to the interaction of neutrons with the medium confined by the side solid-angle of the scintillator with the latter as the centre.  
        关键词：Fermi age and diffusion theory;Subsurface neutron soil moisture meter;Li-glass scintillator   
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        发布时间：2022-08-16
      • Yizheng Ma,Maoqing Chen,Dawei You,Yuanlong Ye,Dakuan Sun
        Vol. 12, Issue 1, (1989)
        摘要：The preparation of crosslinking polyacrylate gels by 60Co γ-raу irradiation of acrylic acid(AA) has been described. The effects of absorbed dose, dose rate, concentration of monomer and additive agent on polymerization and crosslinking reaction have been investigated. The gel contents, swelling capacities and water absorbability of the produced polyacrylate have been determined.The results have shown that the polymerization-crosslinking reaction depends on absorbed dose mainly for dose rate of 102 to 2×103 Gy/h, The gel dose is 62Gy in the 60% (AA) H2O system. The gel amount is increased with the increase of monomer concentrations, and can reach to 79.2% with absorbed dose of 2×103 Gy for the 70% (AA) -H2O system.The water absorbability for dry crosslinking polyacrylate at room temperature is found to be more than 1000.  
        关键词：Acrylic acid;Adsorbent material;Radiation polymerization;Radiation crosslinking   
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        发布时间：2022-08-16
      • Liangquan Ge,Ye Zhang
        Vol. 12, Issue 1, (1989)
        摘要：Radioisotope source X-ray fluorescence analysis technique has been applied to a Pb-Zn deposit. The method of correcting matrix effect has been proposed. Having studied powder samples and outcrop in tunnel for a Pb-Zn orebody group, a mathematical model has been found. It is proved that 77% of Pb samples and 85% of Zn samples for X-ray measurement sampling on outcrop are consistent with the standards from channel sampling. The pricision of X-ray measurement sampling on outcrop is less than 10%.16mm source-sample distance is proved to be optimum, according to the experiments on an artificial "Pb-Zn ore" model in which surface is especially prepared by grinding.A 238Pu-241Am double beam source has solved the problem of correcting scattered radiation for the portable X-ray fluorescence analyser working in tunnel.  
        关键词：X-ray measurement sampling on outcrop;Lead-zinc deposit;Channel sampling;Radioisotope source;X-ray fluorescence analyser   
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        发布时间：2022-08-16
      • Daolun Li,Chenglian Wei,Qinmin Fan,Yawen Liu,Huhou Li
        Vol. 12, Issue 1, (1989)
        摘要：A systematic comparison between the Han Dynasty mirror and the shams on composition, homogeneity and impurities for both sides has been made. The experimental results show that Sn content on the surface of the shams is lower, and impurities are higher than those of the Han Dynasty mirror, which is useful to distinguish the sham from the genuine.  
        关键词：Sham;Ancient bronze mirrors   
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        发布时间：2022-08-16
      • Suwei Jiang,Jun Li,Jianmin Du,Hekang Sang,Laifeng Liu,Xinyuan Jiang
        Vol. 12, Issue 1, (1989)
        摘要：A Freeman type ion source designed for ion implanter is described. The ion source is simple, low consumption and cheap in price. After improving the structure of discharge chamber and extracting system, high quality para-axial ion beam of 0.5—1mA can be obtained. Conventional two slits method is used for measurements of beam emittance. The energy normalized emittance is 2—4×10-5mm·rad·MeV1/2 and normalized brightness≥7.6×1010A/m2·rad·This ion source is suitable for practical uses.  
        关键词：Ion source;Discharge chamber;Extracting system;Emittance;Normalized brightness   
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        发布时间：2022-08-16
      • Linxing Chen,Maobai Chen
        Vol. 12, Issue 1, (1989)
        摘要：A PIG alpha ion source with low arc power and low gas flow is described in this paper. Having been equipped in SINK'S cyclotron, the new source has alpha yield twice as much as the old one and proton yield with an increase of 25 percent. Therefore it can meet the needs for the preparation of isotopes.  
        关键词：Cyclotron;Ion source   
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        发布时间：2022-08-16
      • Huacong Guo,Bizheng Xie,Minghua Wang
        Vol. 12, Issue 1, (1989)
        摘要：Ion beam mixing in the Cr-A1 system with N ion bombardment has been investigated. The 15N (ρ, α) 12C reaction and the RBS have been used to measure the N concentration and the profiles of Cr atoms in the Cr-Al samples, respectively.  
        关键词：Ion beam mixing;Nuclear reaction;RBS   
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        发布时间：2022-08-16
      • Lü Jiaben,Binchai Zhu,Zongwu Wang,Lanjin Wang,Tiehe Chen
        Vol. 12, Issue 1, (1989)
        摘要：The effect of γ-radiation dose, under acute single, fractionated cumulative and chronic continuous irradiation conditions, on PHA-activated lymphocytes micronuclear frequency in peripheral blood of monkeys is reported.The results indicate that the micronuclear frequency, which is increased significantly with increasing doses under all conditions, will be recovered to normal in the 6th month after the termination of irradiation. It is also found that the laws of the micronuclear effect are very similar under the multifractionated and the chronic irradiation conditions, but they are much less than the acute result.  
        关键词：γ-irradiation;Micronuclei;Lymphocyte;Dose effect curve;Monkey   
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        发布时间：2022-08-16
      • Boli Liu,shiping Chen,Taihua Li,Yutai Jin,M. Kojima,M. Maeda,T. Kobayashi
        Vol. 12, Issue 1, (1989)
        摘要：Bromine-82 labelled 6β- (2'-bromo) ethyl-19-norcholest-5 (10) -en-3β-ol (i. e. NCL -6-Et 82Br) has been prepared both by the crown ether method and by the hydrothermal melting method. A study on its distribution in mouse's organs showed a rather selectiver localization of radioactivity in adrenal gland, in which the absorption of NCL-6-Et-82Br was found to be higher than that of CL-6-82Br or NCL-6-82Br. The adrenal/liver and adrenal/ hidney ratios of the titled compound were shown to be higher than those of CL-6-82Br, and near those of NCL-6-82Br.  
        关键词：Radiobromination;NCL-6-82Br;The crown ether method;The hydrothermal melting method;Adrenal imaging agent   
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        发布时间：2022-08-16
      • Yimin Jiang,Jinchang Wu
        Vol. 12, Issue 1, (1989)
        摘要：The total concentration (RT) and equilibrium dissociation constant (KD) of DA-3 dopaminergic receptor in rat striatum were investigated by 3H-dopamine binding assay, and the concentration of antagonist producing a half-maximal inhibition (IC50) and dissociation constant of the receptor-antagonist interaction (Ki) of apomorphine and some classical antipsychotic drugs were measured by competitive binding of labelled and unlabelled ligands. The results showed that: 1. 3H-dopamine binding sites have some essential characteristics of receptor; 2. apomorphine behaves like a mixed agonist-antagonist; 3. the action of classical antipsychotic drugs is not related to DA-3 dopaminergic receptor.  
        关键词：Radioligand binding assay;3H-DA;DA-3 dopaminergic receptor;Apomorphine   
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        发布时间：2022-08-16
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