最新刊期
      卷 0 ， 期 0 ， 2020
      • ZHANG Jiahua
        Issue 12, (1998)
        摘要：Using a method based on the concept of "now of atoms" in the nuclear fuel 238U to describe its generation of derived nuclide under neutron flux’s reaction and the transformation of derived nuclide from generation to generation as well as fission prodtiction accompanied with each derived nuclide, expression of the instantaneous transformation for the fuel consumption and the total fission production is obtained.At the beginning stage, this ratio grows up from zero and increases gradually with reactor operating time corresponding to fifth unstable nuclide series constituted by 238U and its derived nuclide group being in the developing stage. As soon as the fifth unstable nuclide series reaches its equilibrium stage, the transforination ratio approaches its final value very close to unity.  
        关键词：Fifth Unstable Nuclide Series;Derived nuclide;Transformation ratio   
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        发布时间：2021-04-09
      • Issue 12, (1998)
        摘要：The extraction mechanisms of U（Ⅵ）, Th（Ⅳ） and HNO3 in nitric acid solutions with N,N,N’,N’-tetrabutyladipicamide （TBAA） were studied. The effects of nitric acid concentration, TBAA concentration, temperature and salting-out agent （LiNO3） on distribution coefficients of U（Ⅵ） and Th（Ⅳ）, and back extraction behaviours of U（Ⅵ）and Th（Ⅳ） from organic phase were observed. The compositions of complex are UO2（NO3）2·TBAA and Th（NO3）4· TBAA. At lower acidity, the main extraction species of HNO3 with TBAA is HNO3· TBAA; but at higher acidity, the species include HNO3· （TBAA）2, TBAA· HNO3 and TBAA· （HNO3）2. The superficial equilibrium constants and thermodynamical functions of the extraction reactions were also calculated.  
          
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        发布时间：2021-04-09
      • Issue 12, (1998)
        摘要：The thermal ionization mass spectrometry（TIMS） is used to determine the Quaternary geologie age of samples. Ages of some Chinese standard samples （stalagmite GBW04412 and GBW04413） and an international standard sample （coral RKM-4） were determined by the MAT-262 mass spectrometer. The results are in coincident with the certified values.  
        关键词：Thermal ionization mass spectrometry;U-Th disequilibrium age determination;Carbonate rocks   
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        发布时间：2021-04-09
      • Issue 12, (1998)
        摘要：The dose responses of natural potassium feldspar irradiated by gamma rays were measured without annealing of the powder samples. Two glow peaks are observed at 160℃ and 248℃ in the glow curves respectively. The height of the 160℃ glow peak is dependent on the radiation dose while the peak temperature is not related to the dose. However, the glow peak of 248℃ is independent of the radiation dose. Using the activation energy of the 160℃ peak obtained by the initial rise method, the kinetic order of the peak can be determined by fitting the glow curves with the general order kinetics. The results show that the kinetic order of this peak is approximately 2, i.e. the non-first order, and both temperature and shape of the peak keep unchanged do not change while increasing irradiated dose.  
        关键词：Kinetics;Thermoluminescence;Potassium feldspar   
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        发布时间：2021-04-09
      • GUAN Zujie
        Issue 12, (1998)
        摘要：A new bronchial dosimeter has been proposed which consists of only a single sampler and employs only one 400 mesh wire screen and one filter. During sampling air is drawn through the screen and filter at a face velocity of 12.0cm/s. After sampling the measurements of the screen and filter are made, respectively, by gross alpha counting. The annual effective dose （AED, in mSv/a） is then calculated in the tracheobronchial （T-B） region exposed by radon progenies. The dosimeter can be used in conjunction with an activated charcoal canister for measurements of the radon gas concentration to yield the effective dose conversion factor （DCF, in mSv/a per Bq/m3）. The validity of the dosimeter has been tested through measurements of the AED and DCF under different environments. A design of the portable bronchial dosimeter is given.  
        关键词：Protable bronchial dosimeter;Wire screen;Annual effective dose;Dose conversion factor   
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        发布时间：2021-04-09
      • Issue 12, (1998)
        摘要：The 51Cr3+ was intragastrically administered into rats and its absorption,distribution and excretion in various organs were studied at time intervals of 1, 2, 4,8, 16, 24, 48 and 72 hours by the radioactive tracer technique. About 99.6% of the administered chromium was excreted in feces showing that the absorption of 51Cr was less than 1%. The absorbed chromium was accumulated in many organs, in an order of liver>muscle>pancreas>bone>kidney. The fact that the specific activity in pancreas was the highest of all the studied organs indicated that pancreas might be a sensitive organ to 51Cr3+ in the body. The data of 51Cr3+ in blood was proved to fit the three compartments model, suggesting that there were two chromium clearance models in the body-one was quick and the other was slow or stable.  
        关键词：Cr（Ⅲ）;Metabolism;Radioactive tracer technique   
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        发布时间：2021-04-09
      • Issue 12, (1998)
        摘要：The synthesis of [2-15N]-perlolyrine is described. Furfuryl alcohol was first acetylated and formacylated, and then reacted with [α -15N]-dl-tryptophan to form the ring-closed product, which was oxidated and hydrolyzed to give the final product. The product was confirmed by MS, UV and TLC. Its yield from [α -15N]-dl-tryptophan was 15.5%, and the abundance of 15N was 92%. The synthetic [2- 15N]-perlolyrine is therefore suitable for pharmacologic experiments.  
        关键词：[2-15N]-perlolyrine;[α-15N]-dl-tryptophan;Synthesis   
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        发布时间：2021-04-09
      • Issue 12, (1998)
        摘要：The preparation of 14C-sumithion and 14C-malathion is presented in this paper.From 14C-barium carbonate, the 14C-methanol is synthesized and used to react with PSCl3. Then 3 - methanol-4nitrophenol is added solution of 2-hexamonethe to obtain 14C-sumithion. Its radiochemical purity is over 95% and the specific activity is 188.7GBq/mol. On the other hand 2-butenoic acid diaethyl ester is added in the solution of methyl bengene, after addition of malathion and P2S5 to form the terminal product 14C-palathion. Its radio chemical purity is over 95% and the specific activity is 156.4GBq/mol.  
        关键词：14C-labelling;Sumithion;Palathion   
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        发布时间：2021-04-09
      • Issue 12, (1998)
        摘要：The N-amino-5, 6-bibromine norcatharidin was prepared. Then a simple and rapid method was described for the labelling of the compound with 125I. The radiolabelling yield was 95.3% at T= 60℃, t = 40min and pH= 5. In vivo distribution of 125I- N-amino-5, 6-bibromine norcatharidin in the mouse showed a higher uptake in the lung, kidney and spleen.  
        关键词：Catharidin;Norcatharidin;125I labelling;Antitumor activity   
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        发布时间：2021-04-09
      • Issue 12, (1998)
        摘要：Supercritical methanol was used to extract 14C-chlorsulfuron bound residues.When the SFE process was maintained for 30 minutes, 87.82% of total bound residues was found to be extracted. Whether the soil matrix was present or not, chlorsulfuron would be decomposed after the SFE process, and the decomposed products were then subjected to GC-MS analysis for identification. When the soil samples which contained only 14C-chlorsulfuron bound residues were processed by SFE, the released 14C-residues would be further decomposed.  
        关键词：Chlorsulfuron;Bound residues;Supercritical fluid extraction（SFE）;Thin-layer chromatography;GC- MS   
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        发布时间：2021-04-09
      • Issue 12, (1998)
        摘要：The way of raising efficiencies of ion beam modification technology was discussed, and its development situation and important role in national economy were described in this paper.  
        关键词：Ion beam modification;Production efficiencies;Development trend   
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        发布时间：2021-04-09
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