[en] Objective: To discuss how to use nuclear tracks method to measure neutron flux. Methods: Dividing neutron to thermal neutron, middle neutron and fission neutron with solide state nuclear tracker detector that make up of three detecting units to detect neutron flux of different energy. Results: The relatively error of 9.50 cm and 19 cm's detecting result of Am-Be neutron Source are 2.64% and 5.85%. Conclusion: Solide state nuclear tracker detector can be used to measure neutron flux, and it has little volume and unobvious disturbance to neutron field. (authors)

[en] The corrosion tests of Al-B_4C composite materials were set in different concentrations of boric acid solution at room temperature or 40 ℃. The conductivity and pH of each boric acid solution were measured at an approximate frequency of once per three days. The solution composition changes before and after corrosion tests were tested and the changes of the specimens' surface were compared. The corrosion of specimens is due to the aluminum. From 500 ppm to 2500 ppm, there is a specific boric acid concentration. The corrosion rate of specimens in this solution is the slowest. The corrosion rate of specimens at 40 ℃ is faster than that at room temperature. At 40 ℃, the conductivity of boric acid solution increases with the rate of 2.25 × l0"-"2 - 3.23 × l0"-"2 μS/(cm·h). But the pH does not change significantly. At room temperature, the conductivity of the solution increases with the rate of 0.91 × l0"-"2 - 1.13 × l0"-"2 μS/(cm·h). The pH of the solution decreases 0.3 - 0.5. To improve the corrosion resistance of Al-B_4C composite material, surface protection treatment is necessary. (authors)

[en] The measurements of bremsspectrum from 6 MV stable accelerator are carried the by an iterative least-square on numerical analysis of transmission data, and the calculating program of an iterative least-square was written. The problem for the selection of absorber has been discussed

[en] Tungsten films with different thickness were deposited by ion beam mixing techniques on the austenitic stainless steel. Microanalyses of XRD and SEM were measured for the deposited tungsten films before and after H⁺ ion irradiation. The effect of the morphology and phase structure of the tungsten films by H⁺ ion irradiation was studied. The results showed that the deposited tungsten films were nearly amorphous, and tungsten oxides were found due to the contamination of oxygen before H⁺ ion irradiation. Simulation of H⁺ ion irradiation on these films showed that a little crystalline tungsten was gradually transformed into amorphous and the contamination of WO₃ was significantly reduced by preferential oxygen sputtering. There is little difference between surface morphologies of tungsten films before and after H⁺ ion irradiation. Tungsten films surfaces still showed dense, uniform, complete and no obvious damages after H⁺ ion irradiation

[en] A radon progeny continuous monitor was developed. The pump was used for sampling, and radon progeny was collected by filter membrane. The alpha radiation was detected by semiconductor detector, and the pulse was measured by two-channel pulse-height analyzer. The potential energy concentration of radon progeny was calculated through deduction arithmetic, eliminating the effects of ²²⁰Rn by measuring alpha counting of ²¹²Po (8.78 MeV). The monitor can continuously work without replacing filter membrane. The measurement cycles can be selected in four modes: 1, 1.5, 2 and 3 h. Microprocessor MCS51 was used for auto-sampling, measurement and calculation. The measurement range is 0.0015-100 μJ·m^-3. The uncertainty is less than 10% when the measurement value is larger than 0.1 μJ·m^-3. (authors)

[en] XPS was used to measure the elements in the ion beam mixing deposited tungsten films on stainless steel substrates before and after H⁺ ion irradiation. The effect of H⁺ ion irradiation on the binding energy of the element tungsten and tungsten oxides in the deposited tungsten films was investigated. The experiment results show that the binding energy of one part of tungsten component shifted to the lower side due to H⁺ ion irradiation. It is found that the content of the tungsten oxides in the film was reduced by preferential oxygen sputtering after H⁺ ion irradiation

[en] Due to their long lifespan and stable intensity, light sources initiated by tritium instead of electricity or batteries are suitable for low level lighting applications. Therefore, tritium-based radioluminescent (RL) light sources are widely used in both military and civil applications. However, traditional tritium lights with the gas tube structure have several shortcomings: (1) the phosphors are opaque; (2) the glass tube is fragile and easily broken; and (3) the beta kinetic energy is attenuated due to the sorption by the gas; etc. As a result, further application of the tritium lights is limited. In this paper, the lighting mechanism and radiation safety of tritium-based RL light sources are briefly reviewed. Besides, the history and prospects of the development of tritium-based RL light source are discussed. Due to their long lifespan and stable intensity, light sources initiated by tritium instead of electricity or batteries are suitable for low level lighting applications. Therefore, tritium- based radioluminescent (RL) light sources are widely used in both military and civil applications. However, traditional tritium lights with the gas tube structure have several short- comings: (1) the phosphors are opaque; (2) the glass tube is fragile and easily broken; and (3) the beta kinetic energy is attenuated due to the sorption by the gas; etc. As a result, further application of the tritium lights is limited. In this paper, the lighting mechanism and radiation safety of tritium-based RL, light sources are briefly reviewed. Besides, the history and prospects of the development of tritium-based RL light source are discussed. (authors)

[en] Using Monte-Carlo method, physical parameters affecting the intensity of tritium lamp, such as gas pressure and tube diameter, were studied based on glass tube model. The calculation results are in good agreement with that provided by other researchers. This simulation method can be an effective way to design and optimize tritium lamp. (authors)

[en] The measurements of bremsspectrum from 6 MV stable accelerator are carried out by an iterative least-square of numerical analysis of transmission data, and the calculating program of the iterative least-square was written. The problem of selection of the absorber has been discussed

[en] Some techniques of beam profile measurements such as wire rotating scan, Faraday cups array and infrared imaging were investigated. A measurement device was built based on scintillating screen to cater for the demand of accelerator beam profile diagnostics. The device was bombarded under several tens to hundred nanoampere Fe"n"+ (n=5-12) ion beam. The Fe"n"+ ion beam experiment shows that the imaging saturation is mainly caused by light intensity rather than scintillating screen. A way to solve the saturation problem with a specially developed lens was mentioned. The grayscale of beam profile imaging is approximately linear with respect to the beam intensity, and the reason for formation of this relationship was analyzed. (authors)