伊犁盆地南缘煤炭开发区水中放射性特征

Characteristics of water radioactivity in the coal mining area at the southern margin of Yili basin

为了查清伊犁盆地南缘重点煤炭资源开发区放射性环境现状,同时为煤田安全开发与辐射污染防控提供基础数据。在系统收集以往铀矿水化学调查资料的基础上,通过对研究区内井水、泉水、河水、水文地质长期观测孔内水、生产矿区饮用水及铀矿地浸采区地下水等水源采样分析其放射性活度浓度,初步了解了不同含水岩层中放射性核素的分布特征。本次调查共发现30个地下水铀异常点、10个地表水铀异常点、32个地下水氡异常点,划定地下水铀异常区9处、地表水铀异常区5处、地下水氡异常区11处;铀异常区主要分布在洪海沟—加格斯台、苏阿苏—达拉地一带,多位于铀矿床及其周边;氡异常区受矿床控制明显,个别受断层控制;煤矿排水中天然放射性核素浓度与全疆水平相当,生活饮用水中总α、总β符合生活饮用水卫生标准,但铀矿地浸采区地下水中总α、总β超标,不宜饮用。综合分析认为:研究区内铀异常、氡异常的形成多与附近铀矿化的发育存在密切关系,今后其附近地下水开发利用需要开展进一步的放射性环境评价。

In order to investigate the current status of radioactive environment in the key coal resource development areas on the southern edge of the Yili basin,and to provide basic data for the safe development and in groundwater.The water uranium anomaly areas were mainly distributed in the Honghaigou to Jiagesitai and radiation pollution prevention and control of the coal fields.On the basis of the systematic collection of previous uranium hydrochemical investigations,we have gained a preliminary understanding of the distribution characteristics of radioactive isotopes in different water bearing rock layers by sampling and analyzing the radionuclide cativity of water sources such as well water,spring water,river water,hydrogeological long-term observation hole water,drinking water in production mining areas,and groundwater in uranium mining leaching areas within the study area.We found a total of 30 uranium anomaly points in groundwater,10 uranium anomaly points in surface water,and 32 radon anomaly points in groundwater.We have designated 9 uranium anomaly areas in groundwater,5 uranium anomaly areas in surface water,and 11 radon anomaly areas Suasu to Daladi areas,They were mostly located in uranium deposits and their surroundings.The abnormal areas of water radon were significantly controlled by mineral deposits,and some are controlled by faults.The concentration of natural radioactive nuclides in coal mine drainage is equivalent to that of the entire Xinjiang region,The concentration of natural radioactive nuclides in coal mine drainage was equivalent to that of the entire Xinjiang region,and the total amount ofαandβof drinking water in daily life was accorded with the hygiene standards for drinking water,But the total amount ofαandβof groundwater in the in-situ leaching area of uranium mines has exceeded the limit and was not fit to drink.We comprehensively analyze and believe that the formation of water uranium anomalies and water radon anomalies in the study area is closely related to the development of nearby uranium mineralization,so it is necessary to carry out radioactive environment assessment for the development and utilization of groundwater nearby in the future.