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1. Research progress of cement radioactivity in China | |||
Wang Feng,Wu Chuncen,Zhang Xiuqin,Song Yifan,Geng Shang,Wu Zhong,Wang Guoqiang,Sun Yuan-nan | |||
Nuclear Science and Technology 06 March 2024 | |||
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Abstract:Cement, as one of the fundamental building materials, often incorporates industrial solid waste or byproducts as alternative raw materials. Some of these materials contains natural radioactivity at higher levels. Inadequate control of the quantity of these materials can potentially result in prolonged exposure to high levels of radioactivity, posing potential threats to health. This paper provides a comprehensive analysis of radioactivity in cement, including the influence of raw and auxiliary materials on cement radioactivity, release of radioactive nuclides during production, the assessment of radio-nuclide levels in various cement types, and the uncertainty related to radioactivity measurements. The main goal of this study is to begin monitoring natural radioactivity levels at the source of cement production and offer relevant production recommendations for the cement industry. Furthermore, it emphasizes the need for future research to focus on monitoring the natural radioactivity levels of various industrial byproducts used as alternative raw materials, while simultaneously enhancing relevant standards and regulations. This will contribute to ensuring environmental safety in cement production and mitigating potential health risks. | |||
TO cite this article:Wang Feng,Wu Chuncen,Zhang Xiuqin, et al. Research progress of cement radioactivity in China[OL].[ 6 March 2024] http://en.paper.edu.cn/en_releasepaper/content/4762394 |
2. Evaluation on correction factor for in-line X-ray phase contrast Computed Tomography | |||
Jin MingLi ,Huang Zhifeng ,Zhang Li ,Yin Hongxia ,Liu Yunfu,Wang Zhenchang ,Xiao Tiqiao | |||
Nuclear Science and Technology 06 March 2011 | |||
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Abstract:X-ray in-line phase contrast computed tomography (CT) is an effective nondestructive tool, providing 3D distribution of the refractive index of weakly absorbing low-Z object with high resolution and image contrast, especially with high-brilliance third-generation synchrotron radiation sources. Modified Bronnikov's algorithm (MBA), one of the in-line phase contrast CT reconstruction algorithms, can reconstruct the refractive index distribution of a pure phase object with a single computed tomographic data set. The key idea of the MBA is to use a correction factor in the filter function to stabilize the behavior at low frequencies. In this paper, we evaluate the influences of the correction factor to the final reconstruction results of the absorption-phase-mixed objects with analytical simulation and actual experiments. The limitations of the MBA are discussed finally.. | |||
TO cite this article:Jin MingLi ,Huang Zhifeng ,Zhang Li , et al. Evaluation on correction factor for in-line X-ray phase contrast Computed Tomography[OL].[ 6 March 2011] http://en.paper.edu.cn/en_releasepaper/content/4413752 |
3. Stabilization of Airborne Gamma-Ray Spectra From NaI(Tl) Detector | |||
Qin Zhangjian,Wu Qifan,Cheng Jianping | |||
Nuclear Science and Technology 07 September 2009 | |||
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Abstract:NaI(Tl) detectors are always used in Airborne Gamma-Ray Spectrometry. They have the advantages of being efficient for high-energy gamma rays and can be used without cooling. Due to both NaI(Tl) scintillator and photomultiplier tube being sensitive to temperature, spectral drift will occur responding to ambient temperature. An approach is presented to stabilize the NaI(Tl) spectral drift by covering thermal-protective coating on the surface of NaI(Tl) detectors to keep the ambient temperature constantly as far as possible, and by adjusting gain to stabilize the spectra in every incremental time. A new peak-seeking algorithm and a fast convergent algorithm for adjusting gain to stabilize spectra are set forth in the paper. Spectral drifting channels are less than 0.6 in 4 hours, and the quality of NaI(Tl) spectra is improved much, when this approach is used. | |||
TO cite this article:Qin Zhangjian,Wu Qifan,Cheng Jianping. Stabilization of Airborne Gamma-Ray Spectra From NaI(Tl) Detector[OL].[ 7 September 2009] http://en.paper.edu.cn/en_releasepaper/content/34987 |
4. Monte Carlo studies of the Characteristics of Micromegas Detector | |||
Hu Bitao,Wang Wenxin,Zhang Yi,Yang Herun | |||
Nuclear Science and Technology 10 February 2009 | |||
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Abstract:In order to understand gas detector behavior better, the simulation with Garfield was widely developed in many aspects. In this paper, the physical processes of electron drift and multiplication in Micromegas detector were studied using a 3D simulation. The gain and spatial resolution under different conditions were investigated and compared with experimental data. A good agreement found in the present work suggests that 3D simulation is a powerful tool for detector research and optimization. | |||
TO cite this article:Hu Bitao,Wang Wenxin,Zhang Yi, et al. Monte Carlo studies of the Characteristics of Micromegas Detector[OL].[10 February 2009] http://en.paper.edu.cn/en_releasepaper/content/28680 |
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