• Title/Summary/Keyword: energy application

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The detection efficiency study of NaI(Tl) scintillation detector with the different numbers of SiPMs

  • Wang, Bao;Zhang, Xiongjie;Wang, Qingshan;Wang, Dongyang;Li, Dong;Xiahou, Mingdong;Zhou, Pengfei;Ye, Hao;Hu, Bin;Zhang, Lijiao
    • Nuclear Engineering and Technology
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    • v.54 no.7
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    • pp.2564-2571
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    • 2022

  • SiPMs are generally coupled into whole columns in gamma energy spectrum measurement, but the relationship between the distribution of whole SiPM columns and the energy resolution of the measured energy spectra is rarely reported. In this work, ∅ 3 × 3 inch NaI scintillator is placed on an 8 × 8 SiPM array, and the energy resolution of the 137Cs peak at 662 keV corresponding to the γ-ray is selected as a reference. Each SiPM is switched to explore the influence of the number of SiPM arrays, distribution position, and reflective layer on the energy resolution of SiPMs. Results show that without coupling, the energy resolution is greatly improved when the number of SiPMs ranges from 4 to 32. However, after 32 slices (the area covered by SiPMs relative to the scintillator reaches 25.9%), the improvement in energy resolution and total pulse count is not obvious. In addition, the position of SiPMs relative to the scintillator does not exert much impact on the energy resolution. Results also indicate that by adding a reflective film (ESR), the energy resolution of the tested group increases by 10.38% on average. This work can provide a reference for the design and application of miniaturized SiPM gamma spectrometers.

  • https://doi.org/10.1016/j.net.2022.01.010 인용 PDF KSCI

Differential die-away technology applied to detect special nuclear materials

  • Lianjun Zhang;Mengjiao Tang;Chen Zhang;Yulai Zheng;Yong Li;Chao Liu;Qiang Wang;Guobao Wang
    • Nuclear Engineering and Technology
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    • v.55 no.7
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    • pp.2483-2488
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    • 2023

  • Differential die-away analysis (DDAA) technology is a special nuclear material (SNM) active detection analysis technology. Be a nuclear material shielded or not, the technology can reveal the existence of nuclear materials by inducing fission from an external pulsed neutron source. In this paper, a detection model based on DDAA analysis technology was established by geant4 Monte Carlo simulation software, and the optimal sensitivity of the detection system is achieved by optimizing different configurations. After the geant4 simulation and optimization, a prototype was established, and experimental research was carried out. The result shows that the prototype can detect 200 g of 235U in a steel cylinder shield that's of 1.5 cm in inner diameter, 10 cm in thickness and 280 kg in weight.

  • https://doi.org/10.1016/j.net.2023.01.025 인용 PDF

Transparent Conductors for Photoelectric Devices

  • Kim, Joondong;Patel, Malkeshkumar;Kim, Hong-Sik;Yun, Ju-Hyung;Kim, Hyunki
    • Proceedings of the Korean Vacuum Society Conference
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    • 2015.08a
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    • pp.87.2-87.2
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    • 2015

  • Transparent conductors are commonly used in photoelectric devices, where the electric energy converts to light energy or vice versa. Energy consumption devices, such as LEDs, Displays, Lighting devices use the electrical energy to generate light by carrier recombination. Meanwhile, solar cell is the only device to generate electric energy from the incident photon. Most photoelectric devices require a transparent electrode to pass the light in or out from a device. Beyond the passive role, transparent conductors can be employed to form Schottky junction or heterojunction to establish a rectifying current flow. Transparent conductor-embedded heterojunction device provides significant advantages of transparent electrode formation, no need for intentional doping process, and enhanced light-reactive surface area. Herein, we present versatile applications of transparent conductors, such as NiO, ZnO, ITO in photoelectric devices of solar cells and photodetectors for high-performing UV or IR detection. Moreover, we also introduce the growth of transparent ITO nanowires by sputtering methods for large scale application.

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