[en] In this paper, it was introduced that the domestic source-less efficiency calibration software Gamma-Clib(shorter form GC) about its parameters, and the application of GC on a set of HPGe Gamma Spectrometer to obtain the detection efficiency calibration curve. In the experiment, 4 point radiations and 2 cylinder body radiations which can be traceable were used to calibrate the same HPGe detection system. By comparing the results got from two methods, it shows that the deviations of point source were -0.08%∼5.64%, and the deviations of cylinder body source were 3.95%∼16.94%. The results show that GC can be used to calculate the efficiency of HPGe detection system, and can be a of Gamma Spectrometer analysis. (authors)

[en] The well-type HPGe detector is an important equipment to measure weak radioactivity, its efficiency hardly depends on the counting geometry. So, the efficiency must be calibrated using the same nuclide firstly while determining the nuclide activity generally. We calibrate the peak and total efficiency of well-type HPGe detector by using a series single gamma nuclides and research the true coincidence summing effect. The efficiency curve are extended and checked using the known activity sources ⁶⁰Co, ¹³⁴Cs and ¹³³Ba. (authors)

[en] The Beijing Spectrometer (BES) is a large scale magnetic spectrometer for Beijing electron-positron collider. The magnetic field stability of BES is very important for data quality. At present, there are two methods of measuring magnetic field on BES. They are NMR and Hall magnetic field measurement systems

[en] The coupling model of cable was introduced. Finally, the calculation of results were given and compared with the experiment

[en] A low-power pulse amplitude discriminator is described. The discriminator circuit is mainly composed of an integrated voltage comparator, MAX921, and owns the characters of very low-power and low operating voltage

[en] The author sets up the two dimensional Electric Field Integral Equation (EFIE) in the time domain. The way of solving EFIE from one dimension to two by the method of moment is developed, and the formula that can be used in the calculation is given. Finally, a calculation results for SGEMP simulator were presented

[en] A new mode of Gas Electron Multiplier (GEM) is introduced. Its gain property is studied using a MWPC coupled with the GEM, under various Ar/CO₂ ratio. The GEM gain of 94 could be reached

[en] The author introduces possibility for measuring the paper basis weight (mass thickness per unit area) by low energy γ-ray backscattering techniques. The relation between the paper basis weight and the intensity of low energy γ-ray backscattering has been established. A measuring device has been completed and its measuring results are analysed

[en] A design of clock measurement module is introduced. This VXIbus module is implemented based on techniques of high speed data acquisition and digital signal processing, its sampling rate is 500 Msps and time resolution is 2 ns

[en] The software designing method and process of Beam Diagnostic system are discussed, the interface design of the system is also described. The new system has many advantages than original in speed, convenience and stability