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为了评价区域地球化学铀矿普查方法的相对优点,特别是应用地表水中的镭和铀的普查方法,1969年野外季节期间,在萨斯喀彻温省比弗洛支(前译比维尔洛支)地区的一个500平方哩范围内进行了采样。采样地区从阿萨巴斯卡湖岸向北延伸约22哩,从埃尔多拉多镇向东延伸23哩。地表湖水的水样按每平方哩1.3个样品的平均密度采集。河水的水样和沉积物样品在同一地点按每平方哩六约1个样品的平均密度采集。从主要岩石建造中采集了大致95个岩石样品。全部野外记录和分析结果均记录在卡片上,供计算机储存和处理之用。在野外实验室测定了全部样品的氡气、pH 值和碱度,并在采样地点测量了温度。河流沉积物和整份酸化水样送至渥太华,作铀和稀有元素分析。当从小于0.5ppb 含量的样品选定平均值为0.3ppb 时,湖水和河水中铀的本底值接近本工作应用方法的探测极限值(即0.5ppb),并分别大致为0.4和0.5ppb。河水和湖水中氧的本底值分别大致为每升12×10~(-12)和1×10~(12)居里。河流沉积物中铀的本底值为5.1ppm。铀-氡呈强的正相关关系。铀和氡的含量两者均随湖泊或河流大小的增加而减少。有机物在铀和镭的运动环境中起重要作用。由于紊流较慢,河流沉积物的有机物含量随着高程而增加,因而使 pH 值和碱度降低,结果是水中铀的浓度较低,但是沉积物中铀的浓度较高。在八个星期期间从四个湖泊地点和四个河流地点进行季节性采样试验表明,各种离子浓度(指铀的pH 值和重碳酸盐)有轻微变化。另一方面,湖水表面的氡含量每天都有显著的变化。在河流中氡浓度随时间的变化要比湖水小。气象资料表明,有风的日子湖水中氡浓度值低。一般说来,铀分布的型式与氡分布相此,看来更为分散,特别是在湖水中。这很可能是由于:铀比镭更易溶解于地表水中。在崎岖不平的地形,例如比弗洛支地区,湖水采样比河水采样更为有价值。然而,因为湖水中含量浓度低些,分析湖水水样的费用就要高些。比弗洛支地区地表水中的氡和铀同样可以很好地圈定铀矿区,在行之有效的地方,这两种元素的测量均可使用。在分析设备不全或者需要立即取得结果时,用氡法更为合适。
In order to assess the relative merits of regional geochemical uranium census methods, in particular the census method using radium and uranium in surface waters, during the 1969 field season in Befloxac, Saskatchewan ) Area within a sampling area of 500 square miles. The sampling area extends about 22 miles north of the Athabasca Lake shores and 23 miles eastward from El Dorado town. Surface water samples collected at an average density of 1.3 samples per square mile. River water and sediment samples were taken at the same site at an average density of about 1 sample per square mile. Approximately 95 rock samples were collected from the main rock formation. All field records and analysis results are recorded on the card for computer storage and processing purposes. Radon, pH and alkalinity were measured for all samples in the field laboratory and the temperature was measured at the sampling site. River sediments and the entire acidified water sample are sent to Ottawa for uranium and rare elemental analysis. The background values for uranium in lakes and rivers are close to the detection limit of 0.5 ppb (0.5 ppb) for this job application when the selected average is 0.3 ppb for samples less than 0.5 ppb and are approximately 0.4 and 0.5 ppb, respectively. The background values of oxygen in river and lake water are roughly 12 × 10 ~ (-12) and 1 × 10 ~ (12) Curie per liter, respectively. The background value of uranium in river sediments is 5.1 ppm. Uranium - radon showed a strong positive correlation. Both uranium and radon levels decrease with increasing lake or river size. Organics play an important role in the movement of uranium and radium. Due to the slow turbulence, the organic matter content of river sediments increases with elevation, resulting in a decrease in pH and alkalinity, with the result that the concentration of uranium in the water is lower but the concentration of uranium in the sediment is higher. Seasonal sampling from four lake locations and four river locations over a period of eight weeks showed slight variations in various ion concentrations (referring to uranium pH and bicarbonate). On the other hand, radon levels on the lake surface vary significantly from day to day. Radon concentrations in rivers are less variable over time than rivers. Meteorological data show that in the days of wind radon concentration is low. In general, the pattern of uranium distribution appears to be more dispersed than that of radon and appears to be more dispersed, especially in the lake. This is probably due to the fact that uranium is more soluble in surface water than radium. In rugged terrain, such as the Beaverot area, sampling of lakes is more valuable than river sampling. However, because of the lower concentrations in the lake water, the cost of analyzing lake water samples is higher. Uranium deposits can also be well delineated by radon and uranium in the surface water of the BephuLab area, where both elements are available for measurement. The radon method is more appropriate when the equipment is incomplete or needs immediate results.