最新刊期
卷 0 ， 期 0 ， 2020
- 摘要：Using a one-dimensional positron annihilation angular correlation spectromter （FWHM= 0.33mrad） and a positron lifetime spectrometer （FWHM=0.305ns）, we have performed the measurements on angular correlation and positron lifetime spectra of the gamma rays produced by positron annihilation in a series of melt-crystalline polyethylene with different crystallinities and those irradiated by 60Co with different doses. The relation between molecular structure and positron annihilation parameters is discussed.
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发布时间：2021-04-20 - 摘要：The methods of precisely measuring thin solid film thickness in the range of tens nm to several μm by 2MeV 4He+ Rutherford backseattering are studied. Detailed discussion about different methods and the experimental results are given.
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发布时间：2021-04-20 - 摘要：Based on the Q-equation in nuclear reaction, the energy monochromaticity at different emitted angles is carefully discussed, The existing conditions, ranges and formulas for the optimum angles are given. The examples about neutron emitting reactions are given and the calculated results are discussed.
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发布时间：2021-04-20 - 摘要：A method is discussed to confine the beam emittance diagram with beam components and diaphragms or slits. The deflecting magnet is illustrated as an example of the appliea tion of this method.
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发布时间：2021-04-20 - 摘要：An equipment irradiating plant seeds with heavy ions is described. It consists of a beam monitoring system, vacuum chamber, Ni-seperating window, data acquisition and automatic changing system for samples. The beam has a diameter of 40mm, with a density of 103 to 107 p/cm2. The first project relates to genetic effects of 48 MeV/amu C6+ heavy ions on plant cells.
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发布时间：2021-04-20 - 摘要：With a radiation dose of 6 kGy the 95% of bacteria in natural nutritive lotion cream could be killed. This dose gave no effect on physico-chemical properties and nutritive composition. The dose above this would have an effect on colloidal kinetics stability and the effect increased with increasing dose.
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发布时间：2021-04-20 - 摘要：The follow-up measurements have been made by using a Si（Au） detecter with small solid angle geometry for a disintegration of 252Cf.The measured half-life of disintegration is 2.638±0.009 year. This value is in accor dance with other previous results.
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发布时间：2021-04-20 - 摘要：In this paper, a technique for deadtime defermination has been developed. The deadtime can be computed by observing the counting rate of characteristic full-energy peaks mp and that of the full spectrum m, obtained in the cases of γ source 1 and γ sources （1 + 2） res-pectively.
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发布时间：2021-04-20 - 摘要：A position-sensitive △E-E telescope system for identifying products of nuclear reaction induted by heavy ions at low energies has been constructed. It consists of a gas-flow ioni-zation chamber and ten Si （Au） surface barrier detectors.
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发布时间：2021-04-20 - 摘要：During beam transport, the beam may be deviated from the center of the beam line axis for a variety of reasons. In order to improve transport efficiency of the beam transport system, it is necessary to align the beam onto the ion-optical-axis of the beam line. This paper introduces an alignment section containing a pair of steering magnets, a quadru-pole and a profile grid. It is simpler, less expensive and more efficient than other ways.
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发布时间：2021-04-20 - 摘要：A multiple linear regression method was used to compute γ spectra of uranium ore samples and to calculate contents of U, Ra, Th, and K. In comparison with the inverse matrix method, its advantagelies is in the fact that no standard samples of pure U, Ra, Th and K are needed for obtaining reaponse coefficients.
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发布时间：2021-04-20 - 摘要：[4,4-3H]-γ-amino butyric acid was fcrmed from theβ-cyano propionic acid by catalytic reduction in ethanol medium, using tritium gas. β-cyano propionic acid was prepared from glutamic acid by oxidization with chloramine-T. The specific activity of product was 1.51TBq/ mmol, while the radiochemical purity was over 95% by paper chromatography.
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发布时间：2021-04-20 - 摘要：The treatment and disposal of tritiumcontaining scintillation waste liquid are described. An indirect absorption method using activated char is proposed for treating scintillation waste Liquid containing water-soluble tritium samples with high radioactivity. The decontamination rate is over 99%.The dynamic absorption, instead of the static one, has advantages of saving time and large capacity of waste liquid treatment.
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发布时间：2021-04-20 - 摘要：Four kinds of plant seeds were exposed to 46. 6MeV/amu C6+ ions. The results showed that the inbihition of germination ability and growing power for these seeds was increased with the dose of heavy ions. There existed a positive correlation between them. D50 for Triticum acstivum L, Lycium barbarum L, Lathrus sativus L and Cucumis melo var in-dorous is 102, 3×105, 4×106 and 107 p/cm2 respectively. Though a survival curve with resistant tail appears for Triticum acstivum L, the inactivation cross-section a is in turn in the order of 18.5, 16.4 and 5.2μm2 for other seeds.
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发布时间：2021-04-20
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