During operation, nuclear facilities produce radioactive materials, solutions, or aerosols that form α/β/γ mixed radiation in the surrounding environment. Considering their differences in interaction mechanisms, hazards, and protection approaches, it is crucial to discriminate the radiation during measurement. Currently, for portable radiation monitors with simultaneous α/β/γ identification ability, there are two problems: small detection area and high misidentification ratio; in particular, some of them are too difficult in technique and extra expensive. Making use of range differences of α/β/γ, energy difference of α/β/γ in the mixed radiation and different luminescence properties of different scintillators, this study proposes a new large-area Phoswich (phosphor sandwich) design that can identify α, β and γ simultaneously and its corresponding pulse shape discrimination method with better accuracy using the combined information of position, amplitude and time. It is worth mentioning that a special identification circuit scheme with only threshold discriminators, coincidence logic, and counter is suggested to avoid complete waveform collection and analysis, which can increase the detector’s rate capability and identification accuracy. The detector was modeled in Geant4, and the analysis shows its good performance: the misidentification rates for α ( ²⁴¹ Am), β ( ⁹⁰ Sr- ⁹⁰ Y), γ( ¹³⁷ Cs) and γ ( ⁴⁰ K) are 0.00%, 0.33%, 7.28%, and 8.00%, respectively. This study will help improve the Phoswich detector’s performance in α/β/γ radiation measurement.

The normal working state of disconnector is a very important part of the whole power system. It not only affects the operation safety of power grid, but also has a direct impact on the service life and reliability of equipment. At present, there are serious opening and closing problems of circuit breakers in most areas. Therefore, aiming at the corrosion formation state of typical disconnectors, this paper optimizes its automatic analysis method and establishes a data model. Firstly, this paper introduces the operating conditions and functions of disconnectors. Then, this paper expounds the causes of corrosion formation, and designs a data model to analyze the formation state of corrosion. Finally, the experimental observation on the corrosion formation of typical disconnector materials is carried out. After the experimental test, the corrosion degree of the four materials is different. The metal surface finish is grade 13 and the metal composition is industrial pure aluminum brand. The disconnector No. 5056 has high corrosion resistance.