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首页> 外文期刊>Journal of Environmental Radioactivity >Radon emanation from backfilled mill tailings in underground uranium mine
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Radon emanation from backfilled mill tailings in underground uranium mine

机译：地下铀矿的回填厂尾矿中的排放

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Coarser mill tailings used as backfill to stabilize the stoped out areas in underground uranium mines is a potential source of radon contamination. This paper presents the quantitative assessment of radon emanation from the backfilled tailings in Jaduguda mine, India using a cylindrical accumulator. Some of the important parameters such as ~(226)Ra activity concentration, bulk density, bulk porosity, moisture content and radon emanation factor of the tailings affecting radon emanation were determined in the laboratory. The study revealed that the radon emanation rate of the tailings varied in the range of 0.12 -7.03 Bq m~(-2) s~(-1) with geometric mean of 1.01 Bq m~(-2) s ~1 and geometric standard deviation of 3.39. An increase in radon emanation rate was noticed up to a moisture saturation of 0.09 in the tailings, after which the emanation rate gradually started declining with saturation due to low diffusion coefficient of radon in the saturated tailings. Radon emanation factor of the tailings varied in the range of 0.08-0.23 with the mean value of 0.21. The emanation factor of the tailings with moisture saturation level over 0.09 was found to be about three times higher than that of the absolutely dry tailings. The empirical relationship obtained between ~(222)Rn emanation rate and ~(226)Ra activity concentration of the tailings indicated a significant positive linear correlation (r = 0.95, p ＜ 0.001). This relationship may be useful for quick prediction of radon emanation rate from the backfill material of similar nature.
机译：粗磨机尾矿用作回填，以稳定地下铀矿的停产区域，是potential污染的潜在来源。本文介绍了使用圆柱形蓄能器对印度Jaduguda矿的回填尾矿中of排放的定量评估。在实验室中确定了一些重要的参数，例如〜（226）Ra活性浓度，堆积密度，堆积孔隙率，水分含量和影响man散发的尾矿的ra散因子。研究表明，尾矿中the的释放速率在0.12 -7.03 Bq m〜（-2）s〜（-1）范围内变化，几何平均值为1.01 Bq m〜（-2）s〜1，且为几何标准偏差为3.39。 the尾矿中的水分饱和度达到0.09时，ra的散发率有所增加，此后由于to在饱和尾矿中的扩散系数低，散发率逐渐开始随饱和度下降。尾矿的散因子在0.08-0.23范围内变化，平均值为0.21。水分饱和度超过0.09的尾矿的散发因子被发现比绝对干燥的尾矿的散发因子高大约三倍。尾矿的〜（222）Rn释放速率与〜（226）Ra活性浓度之间的经验关系表明存在显着的正线性相关性（r = 0.95，p ＜0.001）。该关系对于从相似性质的回填材料快速预测ra散发率可能是有用的。

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