辐射屏蔽体可用直角三角柱、圆锥台体等一些基本的三维几何图形来描述.
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Each element has at least one isotope with unstable nuclei that can undergo radioactive decay.
每个元素至少有一个同位素不稳定原子核可以进行放射性衰变.
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The waste is safely locked away until it is no longer radioactive.
废料被安全储存起来，直到其不再有辐射性。
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The government declared that it did not dump radioactive waste at sea.
政府宣称并未将放射性废料倾倒在海里。
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The government has been storing radioactive waste at Fernald for 50 years.
政府在弗纳德存放放射性废料已达50年之久。
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原先计划是要将少量的放射性物质封存在一个钢质防护罩中。
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Many nuclear reactor cores consist of radioactive fuel rods dunked in water.
许多核反应堆的核心部分就是由浸在水中的放射性燃料棒组成.
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Wine is radioactive but few people stop drinking it on that account.
酒是有放射性的，可是很少有人因此而戒酒。
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A green radioactive mineral that is a hydrous crystalline phosphate of uranium and copper.
一种白色或灰色的矿石,含锂、铝、磷酸盐,是锂的重要来源.
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Radium , because of its powerful radioactive rays, can go deep into the human body.
镭因为它有强大的放射性线, 能够穿透人们的身体.
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For underwater bursts at certain depths, the radioactive cloud may not be formed.
当在水下某一深度爆炸时, 放射性云团也许不会形成.
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It looked like ordinary salt, but was one million times more radioactive than uranium.
看起来它就像普通的盐, 而它的放射性却比铀要大一百万倍.
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