最新刊期
卷 0 ， 期 0 ， 2020
- 关键词：radioactive tracer;industrial application
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发布时间：2022-09-13 - 摘要：The Chinese ancient bronze mirrors have been studied using 119Sn Mössbauer spectroscopy. It is found that tin is in the state of Sn4+ oxide in the surface of bronze mirror and Cu-Sn-Pb alloy state in the interior body. It is unlikely that the form of tin existing in the surface of bronze mirror has certain relations with the existance of the shiny black surface. 119Sn conversion electron Mössbauer measurements are also used to investigate the variation of relative amounts between the two tin-containing components with the depth from the surface. It is gradually changed from Sn4+ oxide in the surface to Cu-Sn-Pb alloy in the interior. But the variation rate of the ratio between the relative amounts of the two components is not constant.关键词：Mossbauer spectroscopy;archaeology, ancient bronze mirror;119Sn conversion electron;Mössbauer;effect.
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发布时间：2022-09-13 - 摘要：The isotopes enrichment behavior of copper element as a function of sputtered atoms ejection angle has been studied at 50keV Ar+ sputtering ion energy under normal incidence. The present results indicate that the lighter isotope is unenrichment, but the heavier isotope becomes enriched over the ejection angle range from ~5° to~80°.关键词：Key wards: sputtering;Angular distribution;preferential ejection
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发布时间：2022-09-13 - 摘要：Formation of thin films by ion beam bombardment of the coatings of the compounds is a new method which was developed in 1970s. The process to form palladium thin films on the substrate of sillicons and glasses is described and the results obtained by means of scanning electron microscopy and Auger electron spectroscopy are given. In the last paragraph the mechanism and the possible applications of ion beam plated films are discussed.关键词：ion beam plated film;palladium chloride;reacting-ion-beam mixing
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发布时间：2022-09-13 - 摘要：Abundances of trace and rare earth elements from a representative volcanics in the northern Xizang have been measured by instrumental neutron activation analysis. The results indicate that the ophiolitic complex was formed in a small back-arc basin. On the basis of the stratigraphy, magmatic source and geochemical characteristics of volcanics, the evolution process of the northern Xizang back-arc basin may be summarized into three continual periods as following: the expanding, the clossing and post-orogenic periods. Distinct volcanism was occurred in each periods. This hypothesis is consistent with regional geologic data.关键词：Instrumental neutron activation analysis;Trace element;volcanics in the northern Xizang
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发布时间：2022-09-13 - 摘要：A constant fraction differential discriminator used in a fast-fast timing system is described. The discriminator performs both timing and energy range selection functions. The time walk is 120ps for 1 ns risetime input signal from -50mV to -5V. The time resolution as a function of dynamic range in a fast-faft timing system is given. The FWHM is 201 ps when measured with 1.4:1 dynamic range.关键词：Time walk;Time resolution;FWHM
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发布时间：2022-09-13 - 摘要：This paper described the equipments and methods of collection of free-tritium and bound-tritium in environmental samples. The method of low vacuum drying with a yield of 98% was used for collecting free-tritium. A method of catalytic oxidation was used for recovering of bound-tritium with a yield about 93%. The water quantity collected per run from both equipment was large enough to prepare two parallel samples for low background liquid scintillation measurement.关键词：tritium in environmental samples;free-tritium;bound-tritium;freeze drying;catalytic oxdation
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发布时间：2022-09-13 - 摘要：This paper introduces the principle of measuring the velocity by the radioisotope tracer method and the study on the TSC-1 velocity gauge used for measuring the velocity of cotton seeds transported by gas in pipes. The diameters of the test pipes are 100, 200, 250, 290mm, respectively. It is shown that the velocity of single cotton seed, the velocity of wind and the acceleration distance of material in the pipes can be successfully determined.关键词：time-distance method;labelled particle;tracer
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发布时间：2022-09-13 - 摘要：The Mössbauer spectra of Fe-B and Fe-B-Si amorphous alloys at room temperature were determined and a computer programme was created to fit the curves. The parameters of these spectra and the spinning of the iron atoms were evaluated. The spectral characteristics of the amorphous alloys as compared with the ones of their crystals were analyzed, and the physical nature of the invar amorphous alloys was discussed.关键词：Mössbauer spectrum;amorphous alloys;fitting programme
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发布时间：2022-09-13 - 摘要：In this work Rutherford scattering technique was used to determine the unwanted accelerated ions which have the similar charge-mass ratio to the main required beam after the magnetic analyzer. The principle of this technique, the experimental arrangement, and determinations of
ions in the D+ ion beam from deuterium ion source and D+ ions in the ion beam from hydrogen ion source are described. 关键词：Van de Graaff accelerator;Ion beam;beam impurity;Rutherford scattering technique;ions;D+ ions - 8
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发布时间：2022-09-13 - 摘要：The application of 321 model beam profile monitor in our ion source test bench is introduced in this paper with a brief description of its structure and working principle. In our case this monitor is applied to control the working condition of ion source for optimum ion beam formation. Experimental results show that this monitor with continuous display is very useful and convienent for ion beam techniques.关键词：beam profile monitor;vane-type probe;Ion source;plasma boundary;Plasma density;profile of beam
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发布时间：2022-09-13 - 摘要：An on-line data acquisition system was described. It is used to collect data up to 8 parameters and record on magnetic tape in list mode for off-line analysis afterwards. Any two of the parameters can be monitored simultaneously in coincidance or indepan-dence.关键词：8-parameter ND 620 system;hardware and software;experimental results
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发布时间：2022-09-13 - 摘要：Some techniques and experience in running a large-scale program at a small-size computer are introduced through the transplanted programs OPTIC-Ⅱ, RAY TRACE and TRANSPORT at PDP-11/70 and 11/34 computers.关键词：transplanted program;beam-optical transport program
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发布时间：2022-09-13 - 摘要：Irradiation of mushroom with 0.49 and 0.98 kGy doses followed by storage at room temperature for over six days did not exert a deleterious effect on the mice blood indices(RBC, WBC, hemoglobin content, WBC differential count). Biochemical indices (ratio of serum protein, and glutamicpyruvic transaminase indices) showed no significant abnormality. The occurrence of tumour was not related to the dose, no significant difference being found between experimental and control grups.关键词：irradiated mushroom;serum protein;glutamic-pyruvic transaminase
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发布时间：2022-09-13 - 摘要：The methods for computing and monitoring chemiluminescent radom coincidence rate and its relative error are described, also the methods for reducing or eliminating chemiluminescences are recommended.关键词：chemiluminescence;random coincidence;liquid scintillation
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发布时间：2022-09-13 - 摘要：The effects of thyroid hormone on the protein turnover of pancreas in mice were studied using labelled amino acid incorporation, double isotopic and labelled protein decay methods. After injection of L-thyroxine (100µg/mouse) for 5 days, the amino acid incorporation into pancreatic proteins of mice was profoundly decreased, the ratio of 3H/14C in labelled proteins and the fractional turnover rate of pancreatic proteins were also decreased, the protein half-lives being consequently prolonged. These findings suggest that large doses of thyroid hormone may reduce the turnover rate of pancreatic proteins, by inhibiting not only the synthesis but also the degradation.关键词：thyroxine;protein turnover;3H-leucine incorporation;double isotopic method;decay-curve method
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发布时间：2022-09-13 - 摘要：In this paper we are going to discuss the influence of B15C5 on the blood forming organs of mice by using isotope tracing technique. The result of our experiments shows that only the weight of mice itself of their thymuses and spleens decreased to some extent if the young mice was poisoned acutely once or several times. The incorporation of 59Fe into their spleens, thymuses and bone-marrow was restricted. Since the medicine can be easily excreted by the mice, the poisoning reactions disappeared very quickly.关键词：bonzo-15-crown-5;Trace;internal environment
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