最新刊期
卷 0 ， 期 0 ， 2020
研究成果报告
- 摘要：Model FMJ-81 RIA γ counter can be used for both measurement and calculation of the results from the assayed samples. The sample capacity is 250 standard sample test tubes within 25 racks. The energy range of the instrument is such that the isotopes of current interest 125I, 131I, 113mIn, 99Tc, 51Cr and etc. can be counted. The detecting efficiency for 125I, the isotope with the greatest importance in RIA, is more than 76%, with the background less than 70 cpm. Corresponding safety measures have been taken to prevent the sample test tubes, conveyer and drive motor from damage. The instrument can be connected with an MIC-80 microcomputer for real-time data processing. Some of the most widely used empirical curve fittings have been selected to calculate the unknown sample's concentration values. Program for automatically rejecting bad standard curve points has been established. The microcomputer provides flexible calculation capacity and makes programming easy.关键词：RIA (radioimmunoassay);rejection of bad standard curve points;RIA reference shape equation
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发布时间：2022-09-13 - 摘要：Mössbauer spectroscopy has been used to study the phase structure of ferric spinel catalyst, the actions of each phase and each kind of ions and the stability of the catalyst. This work has provided valuable analysis data to the study of new catalyst.关键词：ferric spinel catalyst;oxidative dehydrogenation of butene;butadiene;butadiene rubber;reaction activity;Selectivity;yield;tetrahedral;octahedral
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发布时间：2022-09-13 - 摘要：Monte Carlo method has deen applied to simulate the energy dispersive X-ray fluorescence course. The influences of the scattering processes of incident line in sample upon the intensity of the characteristic X-ray have particularly been considered in the simulation model separately. The intensities of the characteristic line for some pure elements under the unit incident radiation were calculated, and good agreement was obtained between the calculated and experimental results.关键词：Monte Carlo method;X-ray fluorescence analysis;Scattering correction
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发布时间：2022-09-13 - 摘要：Full-energy peak efficiency of a Ge (Li) detector is a function of the detector-sample system, The semi-empiric method based on the concept of solid-angle was successfully applied to a double open-ended coaxal Ge (Li) detector with large volume. The validity of this method was examined experimentely. The solid-angles of the samples were calculated, the efficiency curve of the point source counted at the distance about 20cm from the detector was calibrated in the energy range of 50—3000keV and the polynomial fitting of the experiment data was carried out. The absolute peak efficincies to the measured samples was given. This method provides efficiency corrections for the samples and standards. Consquently, the analytical accuracy and the counting flexibility are improved.关键词：Ge(Li) semiconductor detector;absolute full-energy;peak efficiency
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发布时间：2022-09-13 - 摘要：A hardware interface connecting a TP-801 single card microcomputer with a µ80 general purpose printer and the associated program were introduced. The development capability of the single card microcomputer has been enhanced and the EPROM programming and text printing and saving have been made much easier. The circuit of the interface is simple, easy to use and suitable for common use. The interface can also be used to connect other types of Z-80 single card microcomputers with other types of line-printers with a parallel interface.关键词：single card microcomputer;Hardware;Program
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发布时间：2022-09-13 - 摘要：This paper describes a radiorespirometric method for the quantitative detection ofbacteria. By using an alternative modified method and liquid scintillation counting system 15 species of aerobic bacteria and specimens of water, cooked food and urine were tested. The 14CO2 released in batch cultures of bacteria was measured continuously and cumulatively. Detection time of growth index ≥3 was used to measure number of bacteria positive for the presence of bacterial growth. The results indicated that this technique could offer a rapid, sensitive and dependable approach to quantitative microbiology.关键词：radiorespirometric detection of bacteria (D-U-14C)-glucose;bacterial growth index
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发布时间：2022-09-13 - 摘要：Ion source type 820 is a versatile ion source. It can produce a positive ion beam of most of elements. The structure of the ion source, the influence of discharge parameters on the character of the ion beam and the way of producing heavy ions are described.关键词：solid discharge material;evaporation temperature;supporting gas;internal halogenation method
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发布时间：2022-09-13 - 摘要：The results of a study on the pulse-height distributions produced by single primary electrons in proportional counter are discribed. The electrons were liberated at the inner wall by ultraviolet photons offered by a tunable dye laser. The energy of the electrons was slightly larger than the work function of the proportional counter wall material.Instead of the traditional ultraviolet a laser was used as light source and coincident electronic technique was emploied to eliminate the interference caused by backgrounds. The experiments demonstrated that the pulse-height distribution produced by the single electron with nearly zero kinetic energy was exponential-like when the gas amplification was greater, i.e. the applied voltage on proportional counter was higher.关键词：primary electron;Proportional counter
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发布时间：2022-09-13 - 摘要：A procedure is given for the determination by RNAA of rare earth elements in meteorite. REE group is separated from interfering activities by solvent extraction with TOPO-cyclohexane followed by one fluoride-hydroxide pricipitation cycle. The chemical yield of the separation is finally measured after reirradiation of the REE separates. Gamma-spectra are measured using a SCORPIO-3000 multichannel analyser system. Spectrum analysis is performed by a SAPL computer program. The 84.3keV γ ray of 170Tm is resolved from the 86.8keV γ ray of 160Tb by the program. The precision of the method is better than 10%.According to the REE concentration in the whole rock and chondrite, the chemical fractionation in Boxian meteorite is not appreciable.关键词：Meteorite;Neutron activation analysis;Rare earth elements
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发布时间：2022-09-13 - 摘要：This paper describes the determinations of U, Th, Au and Sc in ores by neutron activation analysis. The sensitivities of this method were 10-7 for U, 10-6 for Th, 10-8 to 10-9 for Au and 10-7 for Sc. Average deviation for Th was 5%. Absolute accidental deviation of Au was <0.5 g/t.关键词：neutron activition analysis;Uranium;Thorium;Gold;scandium
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发布时间：2022-09-13 - 摘要：A method of γ-ray multispectra analysis which can be used to measure γ-activities from short-lived isotopes for the time range of seconds has been discribed. The half-life of residual nucleus 19O from the reactions 19F (n,p) caused by 14 MeV neutrons has been determined, which is coincident with the recently published value.关键词：time programm controlor;multispectra analysis;half-life of 19O isotope
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发布时间：2022-09-13 - 摘要：The P4-fibre adsorbent exhibits high adsorption capacity and high adsorption rate for U. The uranium adsorbed can be readily desorbed by a mixture solution of Na2CO3 and NaC1. The influnce of the common ions on the ability of p4-fibre to adsorbing U is not critical except Fe3+, Al3+, and
. It is suitable to use P4-fibre as an excellent adsorbent to recovery uranium from waste water in industry and mining. 关键词：uranium adsorbent fibre;waster treatment- 8
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发布时间：2022-09-13 - 摘要：The paper describes the radioactivity measurements of natural radionuclides 232Th, 226Ra and 40K in some building materials used in Shanghai district with a Ge (Li) spectrometer. A discussion is also made on the methods of measuring the radioactivity of 226Ra in both equilibrium and disequilibrium states.关键词：Natural radioactivity;Building materials;Ge(Li)γ-ray spectrometer
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发布时间：2022-09-13 - 摘要：Utilizing the ZSS sigle card computer with a liquid scintillation counter the 14C dating can be controlled successfully in an automatic way. Its function includes the record of the counts, check of the errors, changing sample in a pre-set time, calculation of the 14C ages and printing out the dates. Because it has an effective function as well as a small volume and good economy it is suitable to set up in a general 14C laboratory to improve the operation condition. These advantages bear realistic significance for the automation of 14C measurement.关键词：single card computer;14C measurement;collecting and processing of dates;calculation of 14C age;automatic change of samples
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发布时间：2022-09-13 - 摘要：This paper describes the approximate measurement of chemiluminescence in Model-YSJ LSC with MIC-80 microcomputer and deals with some problems in RIA data processing and some software techniques.关键词：LSC;microcomputer;chemiluminescence;RIA;quench correction;Curve fitting
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发布时间：2022-09-13 - 摘要：L-[2,5-I] histidine • HC1 was formed from the L-histidine • HC1 by iodination with iodine.L-[2,5-3H] histidine•HC1 was prepared from the L-[2,5-I] histidine·HC1 by catalytic dehalogenation with tritium. The specific activity of labelled compound was 36 Ci/mmol radiochemical purity was over 95%.关键词：Tritium;Histidine
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发布时间：2022-09-13 - 摘要：A method is described to determine trace amounts of rare earth elements (REE) in nuclear pure thorium dioxide using desolvating ultrasonic nebulizing ICP spectrometry. The D2EHPA-TBP-OK synergic extraction system was used for separation of matrix Th and REE.After thorium was separated from REE, the REE was extract by PMBP-benzene and using NH4CNS and thiosalicylate as masking agent for A1, Mg, Fe, Cu. Then REE were back-extracted into 4N HC1 and determined by ICP-AES using Y as internal standard. Thesensitivity and speed of this method is high.关键词：analysis of rare earth elements;ultrasonic nebulizing ICP spectrometry;extraction of Th
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发布时间：2022-09-13 - 摘要：This paper describes the survey of the dose distribution outside the wall around the cobalt-60 γ-field and factors concerned. Base on the results of the measurements, an empirical formula was set for evaluating dosimetry outside the wall. This paper may provide a guide for building and designing of cobalt-60 γ-field, as well as for evaluating. protection.关键词：60Co γ-field;exposure outside the wall
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发布时间：2022-09-13 - 摘要：This paper reports the radiation effect of 60Co γ-rays applied on M1 generation of wheat at elongation stage. The results of experiment has shown that the growing and development process of M1 generation plant were inhibited due to radiation injury. The results has also shown that the percentage of mainstem panicle at later stage was in close relation with percentage of mosaic leave plant. The percentage of mosaic leave plant increased with increasing radiation dosage, while percentage of main-stem panicle was decreased. If 50% percentage of main-stem panicle or 50% percentage of mosaic leaves plant was taken as half lethal dose (LD50) , the dose was obtained by intersection of growing and declining curves, and was optimal dosage for 60Co γ-rays irradiation at elongtion stage, such dose was found to be 1100—1200 roentgen (P=0.95) .关键词：elongation stage;Radiation damage;radiation repair;percentage of main-stem panicle;percentage of mosaic leaves plant;point of intersection;95% confidence limits
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发布时间：2022-09-13 - 摘要：Radionuclide ventriculography (Equilibrium) is a noninvasive diagnostic method for evaluate left ventricular wall motion. Imaging processing by computer can increase accuracy of data analysis. This report describes clinical application of computer (selected case studies) in imaging processing.关键词：computer;Radionuclide ventriculography;LV wall motion
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发布时间：2022-09-13 - 摘要：This paper describes the computer software for the detection of the left ventricular function by radionuclide angiocardiography. It consists of image smoothing, background correction, counting distribution by profile scan, choosing of ROI, automaic edge detection, integral of the ROI counts, quantification of the left ventricular function parameters and superposition of the end diastole and systole images. The basic principles of the methods are briefly mentioned. By using this software we can obtain four parameters: the left ventricular ejection fraction (LVEF) , the relative stroke volume (RSV) , the relative enddiastole volume (REDV) and the relative cardiac output (RCO) . In addition it is also served to analyse the left ventricular wall motion.关键词：radionuclide angiocadiography;ventricular function;Background;ROI(region of interest);EF (ejection fraction)
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发布时间：2022-09-13
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