最新刊期
卷 0 ， 期 0 ， 2020
- 关键词：Effective dose equivalent;deep dose equivalent index phantom;external irradiation;personal dosimetry;dose equivalent evaluation
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发布时间：2022-09-13 - 摘要：This paper describes the design and results of a fast discrimination-fast counting system. The fast discriminator consists of a high speed GaAs tunnel diode, the fast counting circuit consists of some ECL super high speed D triggers. The resolving time of the system is less than 3ns, the range of discrimination threshold is 10mV—400mV.关键词：photon counting system;double pulse resolving time;negative resistance;D trigger
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发布时间：2022-09-13 - 关键词：communication sampling of milk;radioimmunoassay cow;early pregnancy;diagnosis;solid sample;insemination
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发布时间：2022-09-13 - 摘要：This paper describes the composition, features and major specifications of a liquid steel level monitor used in continuous casting, as well as the design and the measuring method of a nonuniform linear radioisotope source which is used together with the instrument. The instrument features a month by month compensation for the decay of the radioisotope source and a zero output while the liquid steel level is high. The measuring range is about 100mm with the repeatability being ±2% of the whole range. The pulse rate is 450—9000 pulses/s and the maximum output current is 5mA.关键词：Radiation source;Detector;Measuring;Material;steel level
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发布时间：2022-09-13 - 摘要：Mathematical model of optimal design and optimal calculating method for a beam-transport system are described in this paper. The speciality of the optimal design program, calculating experience and example are also given.关键词：beam-transport;NISTS program
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发布时间：2022-09-13 - 摘要：In this paper, a rapid and simple method for determination of potassium in soil is reported. It is high sensitive, less interfering with wide range of determination etc.The content of potassium found by this method, can easily be used to estimate the quantity and β-radioactivity of 40K. It offers the essential data for the measurement of total β-intensity (subtract the contribution of 40K) in the monitoring of environmental radioactivity.The recovery, include the treatment of the sample, is 98—105%, and the coefficient of variation (RSD) is 0.8%. The results given by three different methods (AAS, FS and TPB) are almost identical, the deviation is within 10%. It indicated that this method is dependable and applicable to routine analysis.It can be used to determine potassium of other environmental samples.关键词：AAS;Soil;40K
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发布时间：2022-09-13 - 摘要：The atomic ratio of tantalum nitride foil has been measured by means of transmissive scattering. The atomic ratio in a thin foil sample can be determined accurately due to the fact that the peaks corresponding to different components can be separated easily.关键词：transmissive scattering;atomic ratio
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发布时间：2022-09-13 - 摘要：This paper describes the data processing which is simulated by computer in the case of structural disorder. The broad lines are observed and what is the χ2 value acceptable is discussed.关键词：Mössbauer spectrum;Data processing;fitting;structural disorder;amorphous;micro-crystallite
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发布时间：2022-09-13 - 摘要：In this paper we have presented the manufacture technique of a high resolution Si (Li) X-ray detector and given the characteristics of the material used in our detector. The process and the measures for obtaining a detector with better characteristics were simply described. The silicon materials and the test instruments were made in China. The sensitive volume of the detector is 12mm2×3mm and the junction capacitance is 0.88pF. The best energy resolution obtained for 55Fe source (5.9keV) is 152eV. peak/valley=136. The operating bias is 450 volts.关键词：Si (Li) X-ray detector;Lithium compensation;Energy resolution
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发布时间：2022-09-13 - 摘要：The elements of Ca, Cr, Mn, Fe, Co, Ni, Cu, Zn and Pb in the hair of chromium plated workers were measured and analysed with isotopic source activating XRF, and the influence of elements Cr, Cu and Ni have been discussed.关键词：XRF;Hair;Element
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发布时间：2022-09-13 - 摘要：The counting efficiency of Cerenkov radiation of 32P in water by liquid scintillation counter is around 30%. The main advantage of this measuring method is that no chemical quenching problems occur during the counting. This simple fact makes it possible to prepare samples freely and easily. No scintillation solution was used, so that its cost might be reduced. Now it has been taken into account more often and is popularized rapidly. Some factors of affecting Cerenkov radiation counting such as volume, pH, solvent and etc. were discussed in this paper. Quenching correction methods and wavelength shifters with their application and mechanism. —— the two mportant problems that are most concerned in this field, were also discussed.关键词：Cerenkov radiation;liquid scintillation measuring;wavelength shifter;quenching;quench correction
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发布时间：2022-09-13 - 摘要：In this paper, the preparation of 99mTc-heat denatured red blood cell was described, and clinical significance of spleen imaging in splenomegaly, infarction of spleen, space occupying lesion of spleen and differential diagnosis of left upper quadrent masses was discussed.关键词：99mTc-heat denatured red blood cell;spleen imaging;interventional radiology
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发布时间：2022-09-13 -
Liquid scintillation measurement for radiometric assay of bacteria in urine and clinical application
摘要：Liquid scintillation measurement can be used for clinical rapid diagnosis of bacteruria with characteristics such as rapidity, sensitivity, constancy, objectivity and continuity.The conditions of liquid scintillation measurement of bacteruria were explored in this study. The structure of the liquid scintillation apparatus was modified and a new device, single-compartment spirochete paper was made. Efficiency of the new device is higher than conventional two-compartment scintillation vial and the cost is lower than later. Clinical application has shown that it is very useful.When GI (growth index) 3 is considered as a positive results with the conditions supplied by us the measurement can be completed within 3—6h. Through the data processing it has shown that the GI is related to the bacterial replication times and follows a first-order differential equation within a given species.For the convenient calculation all their mathematical models can be described by a cubic expression.关键词：liquid scintillation measurement;bacteruria;two-compartment vial;single-compartment spirochete paper;bacterial replication times;first-order differential equation;cubic expression- 9
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发布时间：2022-09-13 - 摘要：25 cases of normal person and 53 patients of biliary system disease were examined with hepato-biliary imaging using 99mTc-EHIDA from March 1983 to March 1984. The results showed that the EHIDA can be used as a hepatobiliary imaging agent in several biliary system diseases if the serum bilirubin is less than 7-10 mg/dl. The diagnostic coincident rate is about 95%. When the bilirubin is greater than 10mg/dl, however it fail to give satisfactory imaging.关键词：hepato-biliary imaging;EHIDA
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发布时间：2022-09-13 - 关键词：99MoO4-2_99mTcO4-1 generator;degeneration;regeneration;elution yield
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发布时间：2022-09-13 - 关键词：nuclear reaction spectroscopy;Rutherford backscattering analysis;Mossbauer effect;perturbed angular correlation;nuclear magnetic;resonance;positron annihilation
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发布时间：2022-09-13 - 关键词：isotope-tracer techniques;radiation processing
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发布时间：2022-09-13 - 关键词：radioisotope relay;design philosophy
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发布时间：2022-09-13
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