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      • Shanghai Study Group of Food Irradiation
        Vol. 10, Issue 3, (1987)
        关键词：food irradiation;Absorbed dose;radiation;preservation mechanism;health standard   
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        发布时间：2022-08-16
      • Liguo Cao,Yan Chen,Qi Ao,Huijuan Li
        Vol. 10, Issue 3, (1987)
        摘要：It is an available method to determine directly the absorption coefficient of sample with the matrix effect correction. In this paper the absorption coefficient is calculated using the relation of the characteristic X-ray intensity with the thickness of samples (saturated curve) . The method explains directly the feature of the sample and the correction of the enhanced effect in certain condition. The method is not as same as the usual one in which the determination of the absorption coefficient of sample is based on the procedure of absorption of X-ray penetrating sample.The sensitivity factor KI0 is discussed. The idea of determinating KI0 by experiment and quasi-absoluted measurement of absorption coefficient µ are proposed. The experimental results with correction in different condition are shown in the paper.  
        关键词：EDXRF;method of saturated curve;sensitivity factor KIO;quasi-absoluted measurement   
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        发布时间：2022-08-16
      • Jingcheng Xiao,Qiqing Yuan,Jihua Sun
        Vol. 10, Issue 3, (1987)
        摘要：A chopping circuit of nanosecond pulse ion source with 2×106 Hz repetiton rate for Van de Graaff Generator is described. Calculation of electrical parameter and construction as well as methods of adjustment are discussed.  
        关键词：nanosecond pulse ion source;chopping circuit;elliptic sweep   
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        发布时间：2022-08-16
      • Mingqian Wang,Huaiqun Guan,Tiejun Wu
        Vol. 10, Issue 3, (1987)
        摘要：This article presents a detail description of the ionization chambers using some thin materials as the walls and windows. These ionization chambers comprise two types: one is cylinder-shaped and the other is ball-shaped. They can be used to measure the dose-rate of soft X-ray (>5keV). Through experiments we have obtained angle and energy response and other properties. These properties showed that these two types of ionization chambers are better than those used in measuring the dose-rate of soft X-ray at home and abroad.  
        关键词：Soft X-ray;Ionization chamber;Energy response;angle response   
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        发布时间：2022-08-16
      • Qing Su,Suming Luo,Zhifang Chai,Xueying Mao,Shulan Ma
        Vol. 10, Issue 3, (1987)
        摘要：The paper describes the nondestructive analysis of 22Na, 26A1, 40K, 54Mn and 60Co in the Ningqiang Meteorite——the first Chinese carbonaceous chondrite by a newly developed low background NaI (T1) γ-ray spectrometer with a plastic anticoincidence shield, and also specially discusses data processing methods. The results indicate that our methods are acceptable for the work.  
        关键词：Ningqiang Meteorite;low background NaI (T1) spectrometer   
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        发布时间：2022-08-16
      • Quansen Chen,Yueqin Zhang
        Vol. 10, Issue 3, (1987)
        摘要：We have carried out the work for application and study of ion implantation in IR-devices and Si-CCD. This paper reports some results that We have obtained in recent years.  
        关键词：Ion implantation;IR-devices;Si-CCD   
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        发布时间：2022-08-16
      • Guilin Zhang,Lianfan Liu,Wenxiang Huu,Weinan Zhou,Jiahua Wang
        Vol. 10, Issue 3, (1987)
        摘要：This paper, following first one, mainly describes the influences of vacancy densities on thermodynamics of iron atoms in supersaturated alloy of Cu-Fe. The α-Fe was formed during annealing in certain temperature at the doses of 1 × 1016 at./cm2 or above, the temperatures for forming α-Fe decrease with increasing of the doses. As the doses were going up at 3×1016 and 1×1016at./cm2, a ferromagnetic phase with small internal magnetic field appeared. Probably its lattice structure, is slightly similar to α-Fe, but with vacancies or Cu atoms.  
        关键词：Ion implantation;conversion;electron Mössbauer spectrum;Cu-Fe alloy defect;ferromagnetic phase;supersaturated solid solution thermal;annealing   
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        发布时间：2022-08-16
      • Senhao Lin,Kanglong Sheng,Jinrong Bao,Wenmin Wang,Zhiyi Zhou,Zhiquan Sen,Mujie Yang
        Vol. 10, Issue 3, (1987)
        摘要：A preliminary investigation on ion implantation with iron ion for doping of polyacetylene film was described. We have studied the effects of iron ion implantation in thin sheets of cis-polyacetylene. with a 0.13mPa vacuum chamber and a simple liquid-nitrogen cooling device, Fe+ ion implantations were performed at energies ranging from 15 to 30 keV, with doeses from 5×1015 to 1×1017 ion/cm2. Infre-red spectra showed that cis and trans composition of the polyacetylene film has no significant differences from the pristine ones. Rutherford Backscattering Spectra (RBS) indicated the creation of an iron enriched surface layer. Sheet resistances of the polyacetylene film implanted with 21 keV Fe+ ion showed as a function of dose.  
        关键词：Ion implantation;polyacetylene;Doping   
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        发布时间：2022-08-16
      • Lejun Chen,Yingping Zhang,Liangsheng Zhang,Chaoqing Chen,Hongwei Zheng,Wenxiu Gao,Zhiqing Xu,Chenglin Wei
        Vol. 10, Issue 3, (1987)
        摘要：A Computer on-line position sensing experiment by charge division using SQS pulses in an eight meter tube is described in this paper. The data was off-line analysed in detail. The position resolution is better than 0.12% at the center of the tube, and is 0.32% near the ends. And some other results were obtained.  
        关键词：position sensing;charge division;self-quenching streamer (SQS);Nonlinearity;Position resolution   
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        发布时间：2022-08-16
      • Guangming Zhang
        Vol. 10, Issue 3, (1987)
        摘要：A HgI2 detector was designed with an active surface of 12mm2 and thickness of about 300µm. The working condition is in 600V bias voltage, with pulse shaping time 3 µs using an uncollimated source and at room temperature the obtained energy resolution (FWHM) of the detector is 2.4 keV for 59.5 keV X-rays of 241Am (4%) .The applicability of mercuric iodide detectors is discussed.  
        关键词：Energy resolution;HgI2 X-ray detector   
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        发布时间：2022-08-16
      • Shuming Zhang,Wei Sun,Ruizhi Lan,Lin Hui
        Vol. 10, Issue 3, (1987)
        摘要：We have measured the average effective pore size by means of flowing rate method and the average pore size by the use of electric microscope method. Meanwhile these results were compared. The effect of the pressure on the measurement of the pore size was discussed.  
        关键词：nuclear track microporous membrane;flow rate method;Pore size   
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        发布时间：2022-08-16
      • Yuanxian Xia,Luona Chen
        Vol. 10, Issue 3, (1987)
        摘要：In this paper the spectrophotometric method for determination of trace amount of uranium in weak acidic medium by chlorophosphonazo-mA is described. The composition of the complex was estimated to be 1:1 by slope ratio method. The apparent molar absorption of uranium at 690 nm is 1×105. Beer's law is obeyed for 0—12.0 µg of uranium in 10ml solution. The coefficient of variation for uranium is 0.75%. The method has been applied to the determination of trace amounts of uranium in the extraction process of uranium, and the determination of 233U from neutron irradiated ThO2.  
        关键词：developing agent;chlorophosphonazo-mA;spectrophotometric;determination   
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        发布时间：2022-08-16
      • Shouxiang Ma,Ruikun Yang,Desheng Liu
        Vol. 10, Issue 3, (1987)
        摘要：The research of the sterilization and disinfestation by 60Co γ-radiation and their biological effects on tuber of elevated gastrodia, Chinese angelica and Dangshen have been carried out. The experimental results show that optimal dose was 2×105—6×105 rad to kill insect stegofium (L) of three Chinese traditional drugs. The results also show that the content of the chemical composition of irradiated group is similar to control group under 6×105rad. The thin-layer chromatography colour-maculates are almost the same. They have the same Rf exponent.  
        关键词：Chinese traditional drugs;sterilization and disinfestation by radiation;Biological effects;tuber of elevated gastrodia;Chinese angelica;Dangshen   
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        发布时间：2022-08-16
      • Qiyuan Shen,Huiyuan Li
        Vol. 10, Issue 3, (1987)
        摘要：Lysine is of important amino acids. Tritiated L-lysine is used to study the function and metabolism of lysine in vivo. Therefore, it is an important tracer in biochemical research.The precursor, chloro-lysine was obtained by the reaction of L-lysine hydrochloride with chlorine gas in concentrated hydrochloric acid medium under uv light radiation. Then tritiated L-lysine was prepared by catalysed halogen-tritium exchange.The specific activity of L(β, γ-3H) lysine was 5.9 TBq/mmol (~16Ci/mmol). The radiochemical purity was over 95%.  
        关键词：chloro lysine;halogen tritium exchange   
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        发布时间：2022-08-16
      • Junfa Oin,Yongxian Wang,Yaoliang Xu,Minqian Li,Shiming Wu,Liebao Yan,Beilian Lu,Zhixue Zheng,Yude Cao
        Vol. 10, Issue 3, (1987)
        摘要：The contens of trace element in hair of 108 longevoes (18 males, 90 females)in Shanghai have been determinted by XRF. It was found that the contents of Fe, Mn, Ca, Sr in hair of females were higher than males, while the contents of Ni, Cr in males were higher than females. In contrast with ordinary old people, the hair of longevo was obviously higher in Mn, Fe, Cr, Ti and lower in Cu contents. The contents of Ca and Sr were comparable in both cases.  
        关键词：XRF;Hair;Trace element;Mn;Fe;Cr;Cu   
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        发布时间：2022-08-16
      • Zhenqiu Hu,Tengchang Dai,Yaer Hu,Yingying Yu,Zongqin Xia
        Vol. 10, Issue 3, (1987)
        摘要：Dimethyl acetylenedicarboxylate was tritiated with 3H2 in the presence of Pd-C catalyst and dehydrated to give 〔2, 3-3H〕-succinyl anhydride. Then, 3H-ScAMP in the presence of triethylamine. After purif ication the specific activity was 40 Ci/mmol and the radiochemical purity swa97%. The calibration curve obtained for cyclic AMP RIA with labelled product was satisfactory.  
        关键词：Tritium labelling;〔2,3-3H〕-succinyl cyclic adenosine monophosphate (ScAMP);〔2,3-3H〕-succinic acid   
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        发布时间：2022-08-16
      • Zongzhi Huang,Hongdi Zhou,Shijie Chen,Shumei Gao
        Vol. 10, Issue 3, (1987)
        摘要：A method of trace element analysis by ICP-AES in serum from human eating food preserved by irradiation is described. Trace element analysis in human serum is one of the research projects concerning the wholesomeness78 serum samples of the human eating food preserved by irradiation were collected. After ashing and solving ICP-AES analysis of serum is performed for detection of 12 trace elements in specimen solution. The detection limitations are in the range of 10-2—10-3 ppm for different elements. The recoveries of elements are over 73%.Concentrations of 12 trace elements in 78 human serum has been calculated with F and t tests at PDP 11/70 computer and it was concluded that there is no significant difference between testing group and control group.  
        关键词：irradiated food;serum;Trace element;ICP-AES   
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        发布时间：2022-08-16
      • Changmao Chen,Youqin Wen
        Vol. 10, Issue 3, (1987)
        关键词：neutron surveg meter;Ambient dose equivalent;Energy response;calibration   
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        发布时间：2022-08-16
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