pitchblende

1. The radiometric age of pitchblende is 109-108 m.: 沥青铀矿的同位素年龄为108—109百万年。

2. The pitchblende is the chief industrial mineral.: 沥青轴矿是主要工业矿物。

3. Uranium mineral is pitchblende which was formed in Lower Proterozoic.: 铀矿物主要为沥青铀矿，形成于早元古代。

4. The initial lead in pitchblende belongs to radioactive origin from crust.: 沥青铀矿中的初始铅属地壳放射成因。

5. Then she found that pitchblende was more radioactive than uranium by itself.: 于是她发现沥青油矿，它的放射性要比铀本身还要强。

6. Particularly part of pitchblende samples with colloidal structure features have the same physical and optical features as uraninite.: 尤其有一部分具有胶状构造外表特征的沥青铀矿样品的各项参数均与晶质铀矿一样。

7. The distribution patterns of rare earth elements of pitchblende and surrounding rocks in three types of uranium deposits have been studied.: 该文研究了桂东北地区三种不同类型铀矿床中沥青铀矿及其围岩的稀土元素分布模式。

8. The principal uranium mineral in the deposits of primary subtype is uraninite, but in reworked subtype are pitchblende and relict uraninite.: 原生型矿床中主要铀矿物是晶质铀矿，改造型矿床中的主要铀矿物是沥青铀矿和残余的晶质铀矿。

9. After four years' hard work and refinement of tons of pitchblende, Marie and her husband at last saw the dim blue light of the new element-radium.: 四年的辛勤工作和提炼了大量的沥青铀矿，玛丽和她的丈夫终于看到了发出暗蓝色微光的新元素——镭。

10. After four years' hard work and refinement of tons of pitchblende, Marie and her husband at last saw the dim blue light of the new element-radium.: 四年的辛勤工作和提炼了大量的沥青铀矿，玛丽和她的丈夫终于看到了发出暗蓝色微光的新元素——镭。

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