CAJ | 학술논문

渗流是破碎介质内氡运移的主要方式之一，研究氡在破碎射气介质内的渗流运移和析出规律对氡的防护设计具有重要意义。为此，本文以粒径为4～5 mm的铀矿石为实验样品，利用自制的一维渗流实验装置研究了不同渗流速度下破碎射气介质内孔隙氡活度浓度和介质表面氡析出率的变化规律。实验结果表明，破碎射气介质的气体渗透率较大，氡的运移很容易由渗流主导。当破碎射气介质内氡主要以渗流方式运移时，可通过测量介质内同一位置不同渗流速度的孔隙氡活度浓度或同一渗流速度不同位置的孔隙氡活度浓度，运用氡在射气介质中的浓度分布解析式和非线性最小二乘法，估算出介质的可运移氡产生率。一定渗流速度范围内，同一高度的氡活度浓度随渗流速度的增大呈负指数减小，同一渗流速度的氡活度浓度随离介质渗流入口距离的增大近似呈线性增大。介质渗流出口表面氡析出率随渗流速度的增大呈指数增大，最终趋于稳定。
삼류시파쇄개질내동운이적주요방식지일，연구동재파쇄사기개질내적삼류운이화석출규률대동적방호설계구유중요의의。위차，본문이립경위4～5 mm적유광석위실험양품，이용자제적일유삼류실험장치연구료불동삼류속도하파쇄사기개질내공극동활도농도화개질표면동석출솔적변화규률。실험결과표명，파쇄사기개질적기체삼투솔교대，동적운이흔용역유삼류주도。당파쇄사기개질내동주요이삼류방식운이시，가통과측량개질내동일위치불동삼류속도적공극동활도농도혹동일삼류속도불동위치적공극동활도농도，운용동재사기개질중적농도분포해석식화비선성최소이승법，고산출개질적가운이동산생솔。일정삼류속도범위내，동일고도적동활도농도수삼류속도적증대정부지수감소，동일삼류속도적동활도농도수리개질삼류입구거리적증대근사정선성증대。개질삼류출구표면동석출솔수삼류속도적증대정지수증대，최종추우은정。
The seepage is one of the main ways of radon migration in the fragmented media ,so it is of great significance to study radon seepage migration and exhalation law s in the fragmented emanation media for the design of radon protection .T he uranium ore particles whose diameters were from 4 mm to 5 mm were chosen as the experimental samples ,and a home-made one-dimensional seepage experimental device was used to study the variation of pore radon activity concentration in the fragmented emanation media and the variation of radon exhalation rate in the surface of fragmented emanation media at different seepage velocities .The experimental results show that the gas perme-ability is quite large in the fragmented emanation media ,so the seepage becomes the main force of radon migration .When the main way of radon migration is seepage ,by measuring the pore radon activity concentrations under different seepage velocities at a fixed position or at different positions under a seepage velocity ,the free radon production rate can be estimated according to the analytic equation of radon activity concentration distribution in the emanation media and the non-linear least square method .Within the range of certain seepage velocity ,the radon activity concentration at a position decreases with negative exponent along with the seepage velocity increase ,and the radon activity concentration under a seepage velocity increases approximately linearly along with the distance from the media seepage inlet . The radon exhalation rate on the surface of the media seepage outlet increases exponentially with the seepage velocity ,and gets stable at last .