[en] To further improve the accuracy and detection efficiency on the leakage monitoring with ¹³N of pressurized water reactor, a five-detectors and ten coincidence circuit is designed. The circuit adopts STC89C52 single chip microcomputer as the core part of counting processing, and the measurement result are displayed by the computer. The experimental results show that the main performance indexes of this coincidence circuit satisfy the design requirements and it is applicable to the leakage monitoring with ¹³N of pressurized water reactor. (authors)

[en] This paper describes a design project on data acquisition system of neutron flux density with multiple space-time channels used in a verification facility of accelerator driven sub-critical system (ADS) based on microcomputer. This system is designed to acquire the data of neutron flux density at multiple space spots as time goes. (authors)

[en] Accurate measurement of ¹³N gas concentration in containment is a key issue in nuclear power plant primary loop pressure boundary leakage monitoring. The transport process of the first-loop neutron activation product ¹³N in the containment was investigated by using the computational fluid dynamics software FLUENT, and the concentration of different regions in the containment was obtained. The calculation results show that after the ^l3N gas leaks for 700 s, the concentration of each representative region is stable within the range of 1.70% with the average concentration of 700 ∼ 750 s. The specific concentration of ¹³N gas in different regions helps the ¹³N radiation monitoring instrument to obtain a more accurate primary circuit leakage. (authors)

[en] This paper introduces 32-bit data acquisition software of neutron flux density temporal and spatial distribution on Windows 98 Platform. The software acquires and then deals with data on multi-thread, displays and prints data in the form of graphs and tables, and deals with multiple distributions synchronously with a multi-document interface. (authors)

[en] The author reviews the current status of the nuclear physics experiment course for speciality of nuclear physics and nuclear technology in higher education and expresses author's views on the future improvement of the nuclear physics experiment course

[en] A kind of multichannel nuclear pulse amplitude signal acquisition system is described, which is composed of pulse peak detector, integrated S/H circuit, A/D converter and 80C31 single-chip microcomputer

[en] This paper introduces a Ca/Fe XRF analyzer specially designed for the purpose of teaching the related courses on nuclear engineering and nuclear technology in the university. Both working principle and constitution of the instrument are presented. A comparison between XRF analysis and chemical analysis showed that the two results were in agreement with an error of ±0.7%

[en] A densimeter with radioactive isotope beseemed experiment teaching for speciality of nuclear engineering and nuclear technology in higher education is presented. Principle of work and composing of instrument system are introduced briefly

[en] The author describes a calibration method of the peak efficiency of plate source by means of point source simulation test for NaI(Tl) detector. The comparison between the computed peak efficiencies and the results of calibration with point source simulation test showed that both of them were in agreement within 8%

[en] This paper describes the design of a kind nuclear gauge union function instructional meter, for experiments with three types of nuclear gauge-including level gauge, density gauge and thickness gauge. Hardware design and software design are introduced. Hardware design involves the system construct and circuit principle design of signal processing module (SPM) based on the TMS320LF24 Series DSP chip. The SPM is made up of power supplier conversion circuit, Clock and reset circuit, liquid crystal display circuit and PC interface circuit. Relied on the DSP chip, the speed of SPM on digital signal acquisition and processing is improved. On the software design, modularized program has been used, the procedure flow chart is introduced, and explanation on digital processing is given. (authors)