小体积氡室中氡子体状态参数调控的模拟研究
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摘要
基于空气中氡子体和气溶胶粒子的行为规律,研究了一种小体积氡室中氡子体状态参数稳定调控方法,即通过调节小体积氡室总换气率和气溶胶粒子数浓度实现氡及氡子体浓度、平衡因子和未结合态份额等状态参数稳定调控方法。建立了调控物理模型,根据模拟条件甄选氡子体和气溶胶粒子行为参数,采用Matlab模拟计算了小体积氡室氡子体状态参数的调控范围,并将模拟计算值与实验值进行比对,部分验证本文建立的调控方法。模拟计算结果表明,本研究所建立的调控方法可在小体积氡室内实现氡子体浓度、平衡因子和未结合态份额的稳定调控。本研究建立的调控方法为实验研究提供了初步的理论基础。
A control method of radon progeny state parameters in small radon chamber was established based on behavior theory of airborne radon progeny and aerosol particle.The state parameters including radon and radon progeny concentration,equilibrium factor and unattached fraction were controlled steadily in small radon chamber by adjusting the total ventilation rate of radon chamber and aerosol particle number concentration.Physical model of the control method was established,and the behavior parameters of radon progeny and aerosol particles were selected considering the simulation condition.The control range was calculated by Matlab program,and the physical model was partly verified by inter-comparing theoretical results and experimental data achieved by radon laboratory of University of South China.The inter-comparing results prove that the control method constructed in this paper is applicable,and the control methodprovides a preliminary theoretical foundation for the control experiment of radon progeny state parameters in small chamber.
A control method of radon progeny state parameters in small radon chamber was established based on behavior theory of airborne radon progeny and aerosol particle.The state parameters including radon and radon progeny concentration,equilibrium factor and unattached fraction were controlled steadily in small radon chamber by adjusting the total ventilation rate of radon chamber and aerosol particle number concentration.Physical model of the control method was established,and the behavior parameters of radon progeny and aerosol particles were selected considering the simulation condition.The control range was calculated by Matlab program,and the physical model was partly verified by inter-comparing theoretical results and experimental data achieved by radon laboratory of University of South China.The inter-comparing results prove that the control method constructed in this paper is applicable,and the control methodprovides a preliminary theoretical foundation for the control experiment of radon progeny state parameters in small chamber.
引文
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[21]CHENG Y S.Wall deposition of radon progeny and particles in a spherical chamber[J].Aerosol Science and Technology,1997,27(2):131-146.
[2]刘良军,肖德涛,雷家荣.氡子体连续测量仪的研制[J].原子能科学技术,2007,41(4):509-512.LIU Liangjun,XIAO Detao,LEI Jiarong.Development of a radon progeny continuous monitor[J].Atomic Energy Science and Technology,2007,41(4):509-512(in Chinese).
[3]ZHANG J H,WU Y Y,CUI H X,et al.Measurement and evaluation of EQF3120radon/radon progeny monitor[J].Chinese Preventive Medicine,2010,5(2):198-199.
[4]HATTORI T,ISHIDA K.A continuous monitor for radon progeny and its unattached fraction[J].Radiation Protection Dosimetry,1994,55(2):113-122.
[5]吴喜军.222 Rn/220 Rn子体连续测量方法的研究及仪器的研制[D].衡阳:南华大学,2015.
[6]李文涛.基于α能谱法的222 Rn/220 Rn子体测量仪的研制[D].衡阳:南华大学,2015.
[7]刘艳阳,尚兵,周青芝,等.222 Rn/220 Rn子体测量方法与仪器比较[J].辐射防护,2012,32(1):53-59.LIU Yanyang,SHANG Bing,ZHOU Qingzhi,et al.Comparison of methods and instruments for 222 Rn/220 Rn progeny measurements[J].Radiation Protection,2012,32(1):53-59(in Chinese).
[8]ZETTWOOG P.ICARE radon calibration device[J].Journal of Research of the National Institute of Standards and Technology,1990,95(2):147-153.
[9]BECK T R,BUCHRDER H,SCHMIDT V.Performance tests for instruments measuring radon activity concentration[J].Applied Radiation&Isotopes,2009,67(5):876-880.
[10]PORSTENDFER J.Properties and behaviour of radon and thoron and their decay products in the air[J].Aerosol Science,1994,25(2):219-263.
[11]TSI.Model 3475 condensation mono-disperse aerosol generator-instruction manual[M].USA:TSI,1996.
[12]JUNGE C E.Air chemistry and radioactivity[M].New York:Academic Press,Inc.,1963.
[13]JACOBI W.Activity and potentialα-energy of222 Rn and 220 Rn daughters in different air atmospheres[J].Health Physics,1972,22(5):441-450.
[14]KNUTSON E O,GEORGE A C,FREY J J,et al.Radon daughter plateout-Ⅱprediction model[J].Health Physics,1983,45(2):445-452.
[15]MOHERYL M,EL-HUSSEIN A,ALDDIN SH,et al.Unattached fractions and aerosol attached of radon progeny in indoor air[J].International Journal of the Physical Sciences,2012,7(29):5 089-5 096.
[16]LEONARD B E.222 Rn progeny surface deposition and resuspension-residential materials[J].Health Physics,1995,69(1):75-92.
[17]PORSTENDFER J,REINEKING A.Radon characteristics related to dose for different living places of the human[DB/OL].[2017-06-09].https:∥www.researchgate.net/publication/237487632.
[18]MERCER T T.The effect of particle size on the escape of recoiling RaB atoms from particulate surfaces[J].Health Physics,1976,31(2):173-175.
[19]MERCER T T,STOWE W A.Radioactive aerosol produced by radon in room air[J].Inhaled Particles,1970,3(2):839-851.
[20]俞义樵,任天山.室内氡的来源和特性[J].重庆大学学报:自然科学版,1999,22(3):85-91.YU Yiqiao,REN Tianshan.Source and character of indoor radon[J].Journal of Chongqing University:Natural Science Edition,1999,22(3):85-91(in Chinese).
[21]CHENG Y S.Wall deposition of radon progeny and particles in a spherical chamber[J].Aerosol Science and Technology,1997,27(2):131-146.