通过直接测量建材样块得到室内环境中氡析出率的方法
发明/设计人:
袁红志;谭延亮
申请/专利权人:
衡阳师范学院
申请/专利号:
CN201510634676.0
申请时间:
2015-9-30
公开号:
CN105203743A
公开时间:
2015-12-30
主申请人地址:
421008 湖南省衡阳市雁峰区黄白路165号衡阳师范学院物理与电子信息科学系
摘要:
一种通过直接测量建材样块得到室内环境中氡析出率的方法,将建筑用混凝土做成一个与楼板厚度相同的长方体混凝土样块,将建筑用砖和灰浆做成与墙体厚度相同的长方体砖灰样块,用致密的密封材料作为密封层将混凝土样块及砖灰样块的四面包裹密封,从而制得两种不同材质建材样块。分别对不同材质的建材样块进行测量,根据测量得到的氡浓度上升曲线就可得到建材样块的氡析出率,在这种方式下测量得到的氡析出率就是由该建材样块作为建筑材料构成的室内环境中楼板或墙面的氡析出率。
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A proposal to evaluate radioactivity of cement containing coal fly ash from China national standard: "Limits of radionuclides in building materials''
作者:
Tan, Yanliang* ;Liu, Fudong;Tokonami, Shinji;Xiao, Detao;Shan, Jian;...
期刊:
Journal of Radioanalytical and Nuclear Chemistry ,2015年306(1):277-281 ISSN:0236-5731
通讯作者:
Tan, Yanliang
作者机构:
[Tan, Yanliang] Hengyang Normal Univ, Dept Phys & Elect, Hengyang 421008, Hunan, Peoples R China.;[Liu, Fudong] Minist Environm Protect, Nucl & Radiat Safety Ctr, Beijing 100082, Peoples R China.;[Tokonami, Shinji; Pornnumpa, Chanis; Kudo-Yokota, Hiromi; Wanabongse, Paitoon] Hirosaki Univ, Inst Radiat Emergency Med, Dept Radiat Phys, Hirosaki, Aomori 0368564, Japan.;[Zhou, Qingzhi; Tang, Quan; Shan, Jian; Xiao, Detao] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.;[Hosoda, Masahiro] Hirosaki Univ, Grad Sch Hlth Sci, Hirosaki, Aomori 0368564, Japan.
通讯机构:
[Tan, Yanliang] H;Hengyang Normal Univ, Dept Phys & Elect, Hengyang 421008, Hunan, Peoples R China.
关键词:
Cement;Concrete;Coal fly ash;Radionuclide;Limit
摘要:
This paper is a proposal to evaluate radioactivity of coal fly ash used in cement according the national standard titled “Limits of radionuclides in building materials”. Because concrete includes cement and nature materials with low radioactivity, we propose that the limits of radionuclides in cement contained coal fly ash can be two times relaxed than that of this national standard, and the limit of the internal exposure index on cement may be unnecessary. There is no obviously increase of the Rn-222 exhalation rate from aerated concrete block when the radium content is similar to that of common concrete block.
语种:
英文
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静电收集法闭环式部分积分快速测量氡析出率的方法
发明/设计人:
谭延亮;袁红志
申请/专利权人:
衡阳师范学院
申请/专利号:
CN201510634762.1
申请时间:
2015-9-30
公开号:
CN105182398A
公开时间:
2015-12-23
主申请人地址:
421008 湖南省衡阳市雁峰区黄白路165号衡阳师范学院物理与电子信息科学系
摘要:
一种静电收集法闭环式部分积分快速测量氡析出率的方法,它包括测量过程和计算过程。测量过程采用较短的时间间隔测量,测量间隔2-10分钟,每次测量连续测量多个测量周期的数据。计算过程对静电收集法测氡仪测量得到的集氡罩收集室内氡浓度上升曲线的初始部分数据进行分析,忽略有效衰变常数,并对现有的计算方法进行修正,采用简单的代数运算就能够得到氡析出率。
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开环式同步测量有效衰变常数及氡析出率的方法
发明/设计人:
谭延亮;袁红志
申请/专利权人:
衡阳师范学院
申请/专利号:
CN201510634758.5
申请时间:
2015-9-30
公开号:
CN105158788A
公开时间:
2015-12-16
主申请人地址:
421008 湖南省衡阳市雁峰区黄白路165号衡阳师范学院物理与电子信息科学系
摘要:
一种开环式同步测量有效衰变常数及氡析出率的方法,包括测量过程和计算过程,通过对集氡罩收集室内氡浓度上升曲线数据进行分析,对现有的计算方法进行修正,并进行简单计算就能够得到的较准确的氡析出率。测量过程采用较短的时间间隔测量,既2-10分钟测量一次,测量n个周期直到集氡罩收集室内的氡浓度趋于恒定值。计算过程将测量得到的n个周期的氡浓度数据定义为n个周期中点的氡浓度,再利用式(7)进行非线性数据拟合,就能够同步得到氡析出率和有效衰变常数。
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闭环式部分积分快速测量氡析出率的方法
发明/设计人:
袁红志;谭延亮
申请/专利权人:
衡阳师范学院
申请/专利号:
CN201510634857.3
申请时间:
2015-9-30
公开号:
CN105353396A
公开时间:
2016-2-24
主申请人地址:
421008 湖南省衡阳市雁峰区黄白路165号衡阳师范学院物理与电子信息科学系
摘要:
一种闭环式部分积分快速测量氡析出率的方法,它包括测量过程和计算过程。测量过程采用较短的时间间隔测量,既2-10分钟测量一次,一直测量到集氡罩收集室内的氡浓度趋于恒定值。计算过程对集氡罩收集室内氡浓度上升曲线的初始部分数据进行分析,忽略有效衰变常数,采用简单的代数运算对现有的计算方法进行修正,就能够快速得到较准确的氡析出率。
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Novel method for estimation of the indoor-to-outdoor airborne radioactivity ratio following the Fukushima Daiichi Nuclear Power Plant accident
作者:
Tan, Yanliang* ;Ishikawa, Tetsuo;Janik, Miroslaw;Tokonami, Shinji;Hosoda, Masahiro;...
期刊:
Science of The Total Environment ,2015年536:25-30 ISSN:0048-9697
通讯作者:
Tan, Yanliang
作者机构:
[Tan, Yanliang] Hengyang Normal Univ, Coll Phys & Elect Engn, Hengyang, Hunan, Peoples R China.;[Sorimachi, Atsuyuki; Ishikawa, Tetsuo] Fukushima Med Univ, Fukushima, Japan.;[Janik, Miroslaw] Natl Inst Radiol Sci, Regulatory Sci Res Program, Chiba 260, Japan.;[Tokonami, Shinji] Hirosaki Univ, Inst Radiat Emergency Med, Dept Radiat Phys, Hirosaki, Aomori, Japan.;[Hosoda, Masahiro] Hirosaki Univ, Grad Sch Hlth Sci, Hirosaki, Aomori, Japan.
通讯机构:
[Tan, Yanliang] H;Hengyang Normal Univ, Coll Phys & Elect Engn, Hengyang, Hunan, Peoples R China.
关键词:
Air exchange rate;Airborne sheltering factor;Indoor airborne deposition velocity
摘要:
The accident at the Fukushima Daiichi Nuclear Power Plant (FDNPP) in Japan resulted in significant releases of fission products. While substantial data exist concerning outdoor air radioactivity following the accident, the resulting indoor radioactivity remains pure speculation without a proper method for estimating the ratio of the indoor to outdoor airborne radioactivity, termed the airborne sheltering factor (ASF). Lacking a meaningful value of the ASF, it is difficult to assess the inhalation doses to residents and evacuees even when outdoor radionuclide concentrations are available. A simple model was developed and the key parameters needed to estimate the ASF were obtained through data fitting of selected indoor and outdoor airborne radioactivity measurement data obtained following the accident at a single location. Using the new model with values of the air exchange rate, interior air volume, and the inner surface area of the dwellings, the ASF can be estimated for a variety of dwelling types. Assessment of the inhalation dose to individuals readily follows from the value of the ASF, the person's indoor occupancy factor, and the measured outdoor radioactivity concentration. (C) 2015 Elsevier B.V. All rights reserved.
语种:
英文
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METHOD AND DEVICE FOR IMPROVING DETECTION SENSITIVITY OF STATIC COLLECTING METHOD EMANOMETER
发明/设计人:
TAN, YANLIANG;YUAN, HONGZHI
申请/专利权人:
HENGYANG NORMAL UNIVERSITY
申请/专利号:
WO2015CN71614
申请时间:
2015-01-27
公开号:
WO2015176551(A1)
公开时间:
2015-11-26
摘要:
A method and device for improving the detection sensitivity of a static collecting method emanometer. The detection sensitivity of the static collecting method emanometer is improved by improving the efficiency of collecting positively charged 218Po within a measurement cavity (1) of the static collecting method emanometer, a metal net (7) is arranged between the wall of the measurement cavity (1) and a semiconductor detector (6) to increase the electric field intensity near the wall of the measurement cavity (1), a ground wire of a high voltage module (5) is connected to the surface of the semiconductor detector (6), a high-voltage output wire of the high voltage module (5) is respectively connected to the wall of the measurement cavity (1) and the metal net (7), and therefore high voltages can be added between the wall of the measurement cavity (1) and the metal net (7) and between the metal net (7) and the surface of the semiconductor detector (6), respectively. The electric field intensity near the wall of the measurement cavity (1) is increased, and thus the efficiency of a static electric field in collecting the positively charged 218Po can be improved by adjusting the voltages between the wall of the measurement cavity (1) and the metal net (7) and between the metal net (7) and the surface of the semiconductor detector (6) to appropriate values.
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Analysis of the Saturation Phenomena of the Neutralization Rate of Positively Charged 218Po in Water Vapor
作者:
Tan, Yanliang* ;Xiao, Detao;Shan, Jian;Zhou, Qingzhi;Qu, Jingnian
期刊:
HEALTH PHYSICS ,2014年107(3):255-260 ISSN:0017-9078
通讯作者:
Tan, Yanliang
作者机构:
[Tan, Yanliang; Xiao, Detao; Qu, Jingnian] Hengyang Normal Univ, Hengyang City 421008, Hunan, Peoples R China.;[Zhou, Qingzhi; Tan, Yanliang; Shan, Jian; Xiao, Detao] Univ South China, Hengyang 421001, Peoples R China.;[Tan, Yanliang] Hengyang Normal Univ, Huanbai Rd 165, Hengyang City 421008, Hunan, Peoples R China.
通讯机构:
[Tan, Yanliang] H;Hengyang Normal Univ, Huanbai Rd 165, Hengyang City 421008, Hunan, Peoples R China.
关键词:
Po-218;Rn-222;Rn-222, indoor;radon
摘要:
Generally, 88% of the freshly generated 218Po ions decayed from 222Rn are positively charged. These positive ions become neutralized by recombination with negative ions, and the main source of the negative ions is the OH- ions formed by radiolysis of water vapor. However, the neutralization rate of positively charged 218Po versus the square root of the concentration of H2O will be a constant when the concentration of H2O is sufficiently high. Since the electron affinity of the hydroxyl radical formed by water vapor is high, the authors propose that the hydroxyl radical can grab an electron to become OH. Because the average period of collision with other positively charged ions and the average life of the OH-are much longer than those of the electron, the average concentration of negative ions will grow when the water vapor concentration increases. The authors obtained a model to describe the growth of OH-ions. From this model, it was found that the maximum value of the OH-ion concentration is limited by the square root of the radon concentration. If the radon concentration is invariant, the OH-ion concentration should be approximately a constant when the water vapor concentration is higher than a certain value. The phenomenon that the neutralization rate of positively charged 218Po versus the square root of the water vapor concentration will be saturated when the water vapor concentration is sufficiently high can be explained by this mechanism. This mechanism can be used also to explain the phenomenon that the detection efficiency of a radon monitor based on the electrostatic collection method seems to be constant when the water vapor concentration is high. Copyright © 2014 Health Physics Society.
语种:
英文
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采样测量表层土壤氡析出率获得土壤潜势氡浓度的方法及装置
发明/设计人:
袁红志;谭延亮
申请/专利权人:
衡阳师范学院
申请/专利号:
CN201410129592.7
申请时间:
2014-4-2
公开号:
CN103885078A
公开时间:
2014-06-25
主申请人地址:
421008 湖南省衡阳市雁峰区黄白路165号
摘要:
一种采样测量表层土壤氡析出率获得土壤潜势氡浓度的方法及装置,先用土壤切割装置切割自然状态的土壤,再将土壤切割装置从自然状态的土壤中取出,卸下土壤切割装置上的环刀连接器,切除多余的土壤,将环刀内环两端的土壤修整削平。修整完成后,将取好样的环刀与环刀连接器相连的一端盖上滤膜,将环刀与环刀连接器通过螺纹连接在一起,然后再将土壤切割装置通过管道与气泵及测氡仪连接组合成测量装置,利用测量装置对土壤中氡的产生率进行测量,然后通过计算获得土壤潜势氡浓度。
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氡析出率测量过程中抽气采集容器内氡运移的数值研究
作者:
谭延亮;肖德涛;袁红志;单健;周青芝
期刊:
核电子学与探测技术 ,2014年34(4):456-460 ISSN:0258-0934
通讯作者:
Tan, Y.-L.
作者机构:
[袁红志; 谭延亮] 衡阳师范学院;[肖德涛; 周青芝; 单健] 南华大学
通讯机构:
Hengyang Normal University, Hengyang, Hunan, China
关键词:
氡;析出率;数值模拟
摘要:
氡及其子体是人类所受到的来自天然辐射的主要辐射照射源,近年来我国掺渣建材的广泛使用使得室内氡平均水平有所提高。建筑工程上的防护和减缓是降低室内氡的关键及低成本方法。GB50325-2010首次给出了建材氡析出率检测方法标准。其中主动抽气采集型测定建筑材料表面氡析出率步骤要求抽气采集容器的平均高度为0.5 m。论文通过数值模拟得到较高的高度有利于减少~(222)Rn测量中~(220)Rn的干扰,而且可以降低采气容器内的~(222)Rn浓度,减少反扩散效应。因此~(222)Rn的析出率可以利用低成本的仪器和简洁的计算得到。
语种:
中文
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提高静电收集法测氡仪灵敏度方法的理论探讨
作者:
袁红志;赵桂芝;谭延亮
期刊:
衡阳师范学院学报 ,2014年35(06):29-32 ISSN:1673-0313
作者机构:
[袁红志] 南华大学核科学技术学院,湖南衡阳 421001;[袁红志] 衡阳师范学院,湖南衡阳 421008;南华大学核科学技术学院,湖南衡阳,421001;衡阳师范学院,湖南衡阳,421008;[赵桂芝] 南华大学
关键词:
测氡仪;静电收集法;灵敏度
摘要:
静电收集法连续测氡仪大多采用半导体探测器作为探测元件,其探测灵敏度是低于闪烁室法及电离室法的,但是其具有能谱测量的独特优势.由于可以通过谱分析排除220 Rn的干扰,基于静电收集法的连续测氡仪得到了广泛的应用.本文对影响静电收集法连续测氡仪探测灵敏度的因素进行了分析,发现提高测量腔体和半导体探测器之间的电压;降低测量腔内的空气的湿度;增大测量腔的体积这三种手段是可以提高静电收集法测氡仪的灵敏度的.并且对这三种方法的机理,效果及适用条件等进行了分析,得到一些有益的结论:当测量腔体和半导体探测器之间的电压高于某一阈值后,继续提高电压,测氡仪的灵敏度不再提高;使用干燥管可以有效的提高探测效率,但是不适合无人值守的环境长期监测;通过增大测量腔的体积来提高探测灵敏度时,灵敏度的提高幅度远小于体积增大的幅度.
语种:
中文
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测量浅层土壤氡浓度得到土壤潜势氡浓度的方法
发明/设计人:
袁红志;谭延亮
申请/专利权人:
衡阳师范学院
申请/专利号:
CN201410129573.4
申请时间:
2014-4-2
公开号:
CN103869055A
公开时间:
2014-6-18
主申请人地址:
421008 湖南省衡阳市雁峰区黄白路165号
摘要:
一种测量浅层土壤氡浓度得到土壤潜势氡浓度的方法,它包括测量过程和计算过程;一、测量过程:对土壤打洞0.2-0.5m深,测得该深度的土壤氡浓度为<img file="2014101295734100004dest_path_image001.TIF" wi="40" he="24" />,继续拓展该洞的深度到0.5-0.8m,测得该深度的土壤氡浓度为<img file="2014101295734100004dest_path_image002.TIF" wi="40" he="24" />;二、计算过程:首先建立氡在土壤中运移与分布的微分方程式,然后通过微分方程式建立计算土壤潜势氡浓度的相关公式,再将两次测得的土壤氡浓度<img file="677975dest_path_image001.TIF" wi="40" he="24" />、<img file="657432dest_path_image002.TIF" wi="40" he="24" />带入相关公式联立求解得到土壤潜势氡浓度。
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利用固体核径迹探测器测量218Po长时间平均沉积率的方法及装置
发明/设计人:
袁红志;谭延亮
申请/专利权人:
衡阳师范学院
申请/专利号:
CN201410373948.1
申请时间:
2014-8-1
公开号:
CN104122576A
公开时间:
2014-10-29
主申请人地址:
421008 湖南省衡阳市雁峰区黄白路165号衡阳师范学院物理与电子信息科学系
摘要:
一种利用固体核径迹探测器测量<sup>218</sup>Po长时间平均沉积率的方法及装置,测量时,将测量装置箱体的底部固定在测量环境中室内的墙面,地面或天花板顶上,测量时间为T,T的值根据测量要求为数天到数百天。测量过程完成后,立即取下第一固体核径迹探测器、第二固体核径迹探测器和第三固体核径迹探测器,并对其进行化学蚀刻,分别读取第一固体核径迹探测器、第二固体核径迹探测器和第三固体核径迹探测器上的核径迹数,并通过计算得到<sup>218</sup>Po的长时间平均沉积率。
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闭环式连续测量氡析出率的方法
发明/设计人:
袁红志;谭延亮
申请/专利权人:
衡阳师范学院
申请/专利号:
CN201410203811.1
申请时间:
2014-5-15
公开号:
CN103969673A
公开时间:
2014-8-6
主申请人地址:
421008 湖南省衡阳市雁峰区黄白路165号
摘要:
一种闭环式连续测量氡析出率的方法,测量时将闭环式测量装置中一面开口的集氡罩扣在待测介质的表面上,由于待测介质内的氡原子在扩散与渗流作用下,逸出表面进入集氡罩,导致集氡罩内氡浓度变化,泵以0.5~10升/分的恒定流速将集氡罩内的氡泵入测氡仪测量腔后回送集氡罩,使得测氡仪内测量腔的氡浓度与集氡罩内的氡浓度平衡。然后以时间T为测量周期,连续测量及监测集氡罩内的氡浓度,如果在第i个测量周期后氡浓度基本不变,利用前i个周期的测量值及利用i个测量周期的氡浓度和时间的关系,进行非线性数据拟合得到在前i个周期时间内的氡析出率及有效衰变常数,然后再利用前面得到的有效衰变常数结合后面的测量数据得到后面所有周期的氡析出率。
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利用有效衰变常数开环式连续测量氡析出率的方法
发明/设计人:
谭延亮;刘辉;袁红志
申请/专利权人:
衡阳师范学院
申请/专利号:
CN201410052214.3
申请时间:
2014-2-17
公开号:
CN103777222A
公开时间:
2014-5-7
主申请人地址:
421008 湖南省衡阳市雁峰区黄白路165号
摘要:
一种利用有效衰变常数开环式连续测量氡析出率的方法,在开环式测量氡析出率前,先测量有效衰变常数,通过有效衰变常数直接计算得到氡析出率,其有效衰变常数的测量方法如下:先在测氡仪预设的流率<img file="865994dest_path_image001.TIF" wi="18" he="25" />下测量氡析出率,然后降低泵的流率,得到流率为<img file="2014100522143100004dest_path_image002.TIF" wi="20" he="25" />时的氡析出率,如果此时氡析出率的测量值与流率为<img file="845451dest_path_image001.TIF" wi="18" he="25" />时的氡析出率测量值差异不大,就继续降低流率,直到出现不小于20%的差异,再根据两种不同流率下得到的氡析出率值后通过式(7)<img file="625188dest_path_image003.TIF" wi="144" he="46" />计算得到有效衰变常数的值,由于有效衰变常数的值已知,利用式(5)<img file="2014100522143100004dest_path_image004.TIF" wi="208" he="45" />或式(6)<img file="82714dest_path_image005.TIF" wi="213" he="45" />直接计算得到氡析出率。
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A simple model for automatically measuring radon exhalation rate from medium surface
作者:
Tan, Yanliang* ;Xiao, Detao
期刊:
Radiation Measurements ,2014年64:44-47 ISSN:1350-4487
通讯作者:
Tan, Yanliang
作者机构:
[Tan, Yanliang] Hengyang Normal Univ, Dept Phys & Elect, Hengyang City 421008, Hunan, Peoples R China.;[Tan, Yanliang; Xiao, Detao] Univ South China, Sch Nucl Sci & Technol, Hengyang City 421001, Hunan, Peoples R China.;[Tan, Yanliang] Hengyang Normal Univ, Dept Phys & Elect, Huangbai Rd 165, Hengyang City 421008, Hunan, Peoples R China.
通讯机构:
[Tan, Yanliang] H;Hengyang Normal Univ, Dept Phys & Elect, Huangbai Rd 165, Hengyang City 421008, Hunan, Peoples R China.
关键词:
Simple model;Radon exhalation rate;Sufficient condition
摘要:
A simple model to measure radon exhalation rate from medium surface is developed in this paper. This model is based on a combination of the "accumulation chamber" technique and a radon monitor. The radon monitor is used to perform measurement of radon concentration evolution inside the accumulation chamber, and radon exhalation rate is evaluated via nonlinear least-square fitting of the measured data. If the flow rate of the pump is high enough, radon concentration in the detector's internal cell becomes to be equal to that in the accumulation chamber quickly, and the simple model for measuring the radon exhalation rate can be generated analytically. Generally, the pump flow rate of radon monitor is low, not satisfying the condition. We find other sufficient conditions of this simplified model. On these conditions, the radon exhalation rate can be calculated accurately through this model even the flow rate of the pump is not so high. This method can be applied to develop and improve the instruments for measuring the radon exhalation rate. ©2014 Elsevier Ltd. All rights reserved.
语种:
英文
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闭环式快速测量氡析出率的方法
发明/设计人:
谭延亮;袁红志
申请/专利权人:
衡阳师范学院
申请/专利号:
CN201310443631.6
申请时间:
2013-9-26
公开号:
CN103487360A
公开时间:
2014-01-01
主申请人地址:
421008 湖南省衡阳市雁峰区黄白路165号
摘要:
一种闭环式快速测量氡析出率的方法,它包括测量过程和计算过程。测量时采用较长的时间间隔测量,既5-120分钟测量一次,一次为一个周期,通过两个周期的测量数据就能够通过简单的计算方法快速得到较准确的氡析出率,测量时两个测量周期的时间相等。由于常用静电收集法测氡仪实际测量的是218Po的浓度,有较明显的测量延迟,静电收集法测氡仪跟踪测量变化的氡浓度时,其测量值必须进行修正,通过对测量值进行修正,能够快速得到较准确的氡析出率。
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CAN总线仿真环境的构建及在教学中的应用
作者:
刘辉;谭延亮;焦铬
期刊:
计算机时代 ,2014年(6):44-46 ISSN:1006-8228
作者机构:
衡阳师范学院计算机科学系,湖南衡阳,421002;衡阳师范学院物电系;[焦铬; 刘辉; 谭延亮] 衡阳师范学院
关键词:
CAN总线;仿真;计算机实践课教学
摘要:
首先对CAN总线通讯协议进行分析,然后对嵌入式硬件仿真环境SkyEye的结构进行详细的研究,利用SkyEye构建了CAN总线通讯仿真环境.为了评估所设计的CAN仿真节点的性能,对CAN节点进行了仿真实验.仿真实验表明,我们所设计的CAN节点不仅能正确实现节点间的数据通信,还能达到较高的CAN网络通信速率.最后阐述了在计算机实践课教学中的应用.
语种:
中文
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A theoretical approach to the study of saturation phenomena of electrostatic collection efficiency of 218Po
作者:
Tan, Yanliang* ;Xiao, Detao;Shan, Jian;Zhou, Qingzhi;Yuan, Hongzhi;...
期刊:
Radiation Physics and Chemistry ,2014年100:70-73 ISSN:0969-806X
通讯作者:
Tan, Yanliang
作者机构:
[Tan, Yanliang; Yuan, Hongzhi] Hengyang Normal Univ, Hengyang City 421008, Hunan, Peoples R China.;[Zhou, Qingzhi; Tan, Yanliang; Feng, Bin; Shan, Jian; Xiao, Detao] Univ South China, Hengyang City 421001, Hunan, Peoples R China.;[Tan, Yanliang] Hengyang Normal Univ, Huangbai Rd 165, Hengyang City 421008, Hunan, Peoples R China.
通讯机构:
[Tan, Yanliang] H;Hengyang Normal Univ, Huangbai Rd 165, Hengyang City 421008, Hunan, Peoples R China.
关键词:
Radon monitor;Electrostatic collection cell;Collection efficiency;Po-218
摘要:
Radon monitors based on electrostatic collection have been widely used in different radon studies. Collection efficiency of this kind of instrument first depends on the cell geometry and electrostatic field intensity. In the process of new instrument development, some researchers found that electrostatic collection efficiency of <sup>218</sup>Po was almost saturated when the voltage between the cylindrical vessel and the detector was higher than 1500V. In this paper, we analyze the physical processes of the freshly positively charged <sup>218</sup>Po formed from the αdecay of <sup>222</sup>Rn and the neutralization kinetics for positively charged <sup>218</sup>Po cluster. The analytical expressions of the collection probability of any freshly positively charged <sup>218</sup>Po cluster and the total collection efficiency in electrostatic collection cell are obtained. The ratio of the relative growth rate of the collection efficiency to the relative growth rate of the voltage is inversely proportional to the voltage. Such an approach is useful to understand the mechanism of the electrostatic collection of <sup>218</sup>Po. ©2014 Elsevier Ltd.
语种:
英文
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静电收集法测氡仪快速同步测量氡源有效源强及氡室泄漏率方法
作者:
谭延亮;肖德涛;赵桂芝;单健;周青芝;...
期刊:
核电子学与探测技术 ,2014年34(7):846-849 ISSN:0258-0934
作者机构:
[谭延亮] 衡阳师范学院物电系,衡阳421008;南华大学核科学技术学院,衡阳421001;南华大学核科学技术学院,衡阳,421001;衡阳师范学院物电系,衡阳,421008;[赵桂芝; 肖德涛; 冯缤; 康玺; 周青芝; 单健] 南华大学
关键词:
氡室;氡源;有效源强;泄漏率
摘要:
氡室是刻度测氡仪的一种标准装置,还可以用于相关科学实验。氡源的有效源强和氡室的泄漏率是2个非常重要的参数。在分析传统测量方法的基础上,提出了利用静电收集法连续测氡仪快速同步测量氡源的有效源强及氡室泄漏率的新方法。仅仅利用2个较长周期的测量数据就得到了这两个参数,实验证明该方法准确可靠。
语种:
中文
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