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作者： CHEN Xi-lin QIN Guo-xiu GUO Xiao-qing CHEN Yong-yong MENG Jun Radiation metrology division

Monitoring the occurring and radioactivity concentration of fission products in nuclear reactor loop water is important for the nuclear reactor safe running evaluation,prevention of accidence and safe protection of wo...

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A Software for Calibration of Planar Matrix Detector

A Software for Calibration of Planar Matrix Detector

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作者： SONG Ming-zhe YE Hong-sheng LI Wei WEI Ke-xin WANG Hong-yu GAO Fei HOU Jin-bing Radiation metrology division

Planar matrices of diodes or ionization chambers were widely used in the verification of dose for intensity modulated radiation therapy(IMRT)and *** calibration of relative response of individual detectors must be performed before used,because of the large discrepancies of each one in the matrix.A software(Figure 1)was compiled for the calibration of a matrix of(4×4 to 32×32)detectors,

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Digital holographic shape measurement using Fizeau microscopy

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Chinese Optics Letters 2015年第10期13卷 40-44页

作者： D.G.Abdelsalam Junwei Min Daesuk Kim Baoli Yao State Key Laboratory of Transient Optics and Photonics Xi'an Institute of Optics and Precision MechanicsChinese Academy of Sciences Engineering and Surface metrology Laboratory National Institute of Standards division of Mechanical System Engineering Chonbuk National University

We present a Fizeau interferometer using a microscopic objective as a tool for surface contouring without the need for a numerical lens for reconstruction. The interferometer is associated with a telescope system to feature the object with collimated light. The experiment is conducted on two objects possessing different step *** phase maps from the captured off-axis holograms are calculated numerically, which allows us to deduce the contours of the objects. The great advantages of the presented technique are that it can be done in real time and there is no need for numerical lenses for micro-objects reconstruction.

关键词： interferometer holographic captured reconstructed numerically microscopic Reconstruction compensate wavefront filtered

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Experimental Uncertainties of TEPC Dose Equivalent

Experimental Uncertainties of TEPC Dose Equivalent

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作者： ZHANG Wei-hua XIAO Xue-fu WANG Zhi-qiang LIU Yi-na LI Chun-juan LUO Hai-long Radiation metrology division

The tissue-equivalent proportional counters(TEPC)are widely used for radiation protection in mixed radiation *** operational quantity H*(10)can be directly obtained by means of microdosimetric spectra measurements with *** empirical evaluation of uncertainties is reported in this *** sources of uncertainties involved in measuring microdosimetric spectra mainly are the sensitive

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Research on Formula of Radiochromic Film Dosimeters Based on Polyvinyl Butyral for Dose Measurements of 0-6.5 kGy

Research on Formula of Radiochromic Film Dosimeters Based on...

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作者： CHEN Yi-zhen YE Hong-sheng LI Hua-zhi CUI Ying LI Ming LIN Min ZHANG Wei-dong XIA Wen CHEN Ke-sheng XU Li-jun Radiation metrology division

The formula of a low-dose radiochromic film dosimeters containing leuco-malachite green(LMG)dye in polyvinyl butyral(PVB)was studied for dose measurements of 0-6.5 *** order to choose appropriate additive,the performa...

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Rapid Separation of Fission Product 141La

Rapid Separation of Fission Product 141La

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作者： XIA Wen YE Hong-sheng LIN Min CHEN Ke-sheng XU Li-jun ZHANG Wei-dong CHEN Yi-zhen Radiation metrology division

La was separated and purified from fission products in this work for physical measurements aimed at improving the accuracy of its decay *** the impact ofLa and other fission products,cesium(Cs,Cs included)was rapid se...

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Cosmic Rays Response of High-pressure Ionization Chamber

Cosmic Rays Response of High-pressure Ionization Chamber

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作者： GAO Fei XIAO Xue-fu NI Ning ZHANG Xi HOU Jin-bing SONG Ming-zhe WANG Hong-yu Radiation metrology division

In order to study cosmic rays response characteristics of self-designed HPIC(high pressure ionization chamber),model JLZ-Ⅲ,the JLZ-Ⅲwas placed on a boat which is 3 meters much deeper and at least 1 kilometer away fr...

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Resent Progress in Research on Calibration Instrument for Radioactive Aerosol Monitor

Resent Progress in Research on Calibration Instrument for Ra...

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作者： CHEN Xi-lin CHEN Yong-yong WU Chang-ping XING Yu MENG Jun YANG Qiao-ling Radiation metrology division

Radioactive aerosol monitors are widely used in monitoring the radioactivity concentration of the artificial nuclides in gaseous effluents from the nuclear *** on-developing calibration instrument for radioactive aero...

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Research of Multi Detectors of Neutron Spectrum in Mix Fields

Research of Multi Detectors of Neutron Spectrum in Mix Field...

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作者： LI Wei CHEN Jun WANG Zhi-qiang LI Chun-juan LIU Yi-na LUO Hai-long ZHANG Wei-hua Radiation metrology division

This neutron spectrometer can be used to measure neutron spectrum and neutron equivalent *** range of neutron spectrum is thermal-20 MeV,and the range of neutron equivalent dosimetry is 1μSv·h-4 mSv·h.

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Validation and Comparison of Calibration Techniques for Measurements of Carbon Dioxide in Atmospheric Air Standards

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Journal of Environmental Protection 2018年第1期9卷 34-49页

作者： Andreia de Lima Fioravante Cristiane Rodrigues Augusto Valnei Smarcaro da Cunha Luiz Antonio d’Avila Chemical and Thermal metrology division Scientific and Industrial Metrology DirectorateNational Institute of MetrologyQuality and Technology-InmetroDuque de CaxiasBrazil Engineering Program in Chemical and Biochemical Processes Escola de QuimicaUniversidade Federal do Rio de JaneiroRio de JaneiroBrazil

The increase in the concentration of carbon dioxide (CO2) in the atmosphere has led the scientific community to investigate the adverse effects on humanity and nature, including the greenhouse effect, which contributes to global warming and can lead to climate change, besides the risks associated with human health. Due to the importance of metrological issues in the current scenario, the Laboratory of Gas Analysis (Lanag) of the National Institute of metrology, Quality and Technology (Inmetro) is developing the methodology of preparation of such primary standard gas mixtures through gravimetry. For the preparation of these standards, an analysis verification step is necessary, carried out by means of an analytical technique of comparison, at low levels of concentration, by cavity ringdown (CRDS) and by gas chromatography using a flame ionization detector coupled to a methaniser catalyst (GC-FIDmeth). This work presents the method validation of both methodologies developed to analyze a range of concentration of atmospheric standards of CO2 at a matrix of synthetic clean dry air (SCDA) by CRDS and GC-FIDmeth, of which the analysis results can compromise the measurements on atmospheric air quality. The objective is to compare results of method validation of both analytical methods for low CO2 concentration through the use of primary reference mixtures developed and also by certified reference material. The validation measurement results were analyzed according to the requirements of ISO 5725: 1994 parts 1 and 2, and the calculation of measurement uncertainty followed the methodology described in ISO 6143:2001, with results showing satisfactory consistent between both selected techniques. According to the work presented here, the obtained validation results for CRDS are better than the GC results, such as the relative uncertainty of samples evaluated for CRDS was 0.4% and 2.7% for GC_FID meth.

关键词： Primary Standard Mixture Carbon Dioxide Greenhouse Gas Gas Chromatography Cavity Ring-Down System

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