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Experimental investigation on the radiation background inside body counters

Nuclear Science and Techniques 2022年第2期33卷 66-78页

作者： Yu Wang Yuan-Yuan Liu Bin Wu Xiang-Peng Meng Jian-Ping Cheng Ying Wang Li-Jiao Wang Yun-Shi Xiao Qin-Jian Cao Jian-Feng Zhang Fei Tuo Key Laboratory of Beam Technology of Ministry of Education College of Nuclear Science and TechnologyBeijing Normal UniversityBeijing 100875China Department of Nuclear Safety China Institute of Atomic EnergyBeijing 102413China Department of Health Physics China Institute for Radiation ProtectionTaiyuan 030006China National Institute for Radiological Protection Chinese Center for Disease Control and PreventionBeijing 100088China

In vivo measurement of radioactivity based on various body counters is arguably the leading measure used to determine the distribution and activity of radionuclides in human subjects,such as I-131 in the thyroid,Am-241 in the lungs,and Pb-210 in the *** the measurements,the radiation background is the key factor that determines the sensitivity of the ***,to facilitate in vivo measurements,a well-designed shielding room is required to create a low-background ***,because the compositions of the radiation background are quite complicated,the respective contributions from each source remain obscure,which places a considerable burden on seeking an optimized design of shielding rooms that strikes the optimum balance between the construction cost and background suppression *** this study,we conducted a systematic experimental investigation on the radiation background outside and inside four representative body counters with assorted designs using a variety of radiation detectors,including high-purity germanium detectors,CdZnTe detector,radon emanometer,and gamma-ray *** carefully controlling the experimental conditions and synergetic analysis of the measurement results,in conjunction with previous studies,we separated and determined the relative contributions induced by environmental radiation(4%),airborne radon and its daughters(2%),the normal radioactivity of human subjects arising from K-40(58%),cosmic rays(12%),and radioactivity in shielding materials and measuring instruments(24%).Furthermore,based on these results,we discuss practical guidelines to design a shielding room for body counters.

关键词： Body counter radiation background Shielding room In vivo measurement

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Middle and near ultraviolet spectrograph of the Scientific Experimental system in Near SpacE(SENSE)

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Earth and Planetary Physics 2023年第6期7卷 655-664页

作者： Xin Sun DaLian Shi Zhen Chen Ran Li WeiWei Cao Jun Zhu YongLin Bai Le Wang Fei He Key Laboratory of Ultra-fast Photoelectric Diagnostics Technology Chinese Academy of SciencesXi’an 710119China Institute of Optics and Precisian Mechanics Xi’an 710119China National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China Institute of Geology and Geophysics Chinese Academy of SciencesBeijing 100029China

The Scientific Experimental system in Near SpacE(SENSE)consists of different types of instruments that will be installed on a balloon-based platform to characterize near-space environmental *** one of the main scientific payloads,the middle and near ultraviolet spectrograph(MN-UVS)will provide full spectra coverage from middle ultraviolet(MUV,200−300 nm)to near ultraviolet(NUV,300−400 nm)with a spectral resolution of 2 *** primary mission is to acquire data regarding the UV radiation background of the upper *** MN-UVS is made up of six primary components:a fore-optical module,an imaging grating module,a UV intensified focal plane module,a titanium alloy frame,a spectrometer control module,and a data processing *** paper presents in detail the engineering design of each functional unit of the MN-UVS,as well as the instrument’s radiometric calibration,wavelength calibration,impact test,and low-pressure discharge ***,we are able to report ground test and flight test results of high quality,showing that the MN-UVS has a promising future in upcoming near-space applications.

关键词： ultraviolet spectrograph radiation background imaging grating intensified detector low-pressure discharge spectral calibration

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Radiobiogeochemical Assessment of the Soil Near the Issyk-kul Region

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Journal of Geological Resource and Engineering 2016年第1期4卷 39-43页

作者： Djenbaev Bekmamat Kaldybaev Bakit Toktoeva Tamara Kenjebaeva Aigul Biology & Pedology Institute of National Academy of Science Chui Ave 265 Bishkek 720071 Kyrgyz Republic

The results of researches are presented the concentration of humus, macro and trace elements and radionuclide in the soil of the Issyk-Kul region. It has given radio biogeochemical assessment of the current status of ... 详细信息

关键词： Soil radionuclide radiation background radioactive tailing Issyk-Kul region

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