"These creatures get their energy from sources we never imagined," McKay exclaims. "the South African extremophile bacteria are powered by the radioactive decay of unstable atoms in the rocks."
“这些生物从一个我们从未想到的来源获取能量，”McKay惊叹，“南非的极端微生物细菌吃的是岩石里不稳定原子衰变时的放射能。”
Lead isotope research shows that lead in ores of Mujiazhuang copper deposit and near ore country rocks is characterized by being rich in radioactive lead.
铅同位素结果研究表明，穆家庄铜矿矿石铅和近矿围岩岩石铅具有富含放射性成因铅的特点。
However, other rocks are also radioactive, notably some carbonates and feldspar-rich rocks.
然而其它一些岩石也有放射性，常见于碳酸盐岩和富含长石的岩石。
Petrographically and mineralogically similar rocks quite often have different concentrations of radioactive elements.
岩石学矿物学上类似的岩石，其放射性元素丰度却往往有所不同。
She and colleagues explored the depths of South African gold mines and, to their great surprise, found bacteria sustained only by the radioactive decay of nearby rocks.
她和同事探索南非金矿的深度时惊奇得发现，细菌只存在于四周岩石的放射性腐烂层。
Radon is a gas that comes from the radioactive decay of radium in rocks.
氡是来自岩石中镭辐射衰变而产生的气体。
One possibility is radioactive elements decaying inside rocks, which already give the Earth about 0.025 percent of its geothermal energy.
一种可能性就是内部岩石的放射性衰变，地球热量的0.025%来自于这种衰变。
Radon is a gas that comes from the radioactive decay of radium in rocks.
氡是来自岩石中镭辐射衰变而产生的一种气体。
Because a radioactive form of argon is produced by decay of a naturally occurring radioactive potassium isotope, it can be used to date rocks and samples more than 100,000 years old.
因为它是稀有天然放射性同位素钾衰变而产生的，所以可以用来测定十万年以上的岩石年龄和采样。
A radioactive source is used to bombard the rocks surrounding the wellbore with gamma rays. By counting the backscattered gamma rays, the density of the subsurface rock can be computed.
利用放射性源的伽马射线轰击井眼周围的岩石，通过对反散射伽马射线计数，可以计算出地下岩石的密度。
A radioactive source is used to bombard the rocks surrounding the wellbore with gamma rays. By counting the backscattered gamma rays, the density of the subsurface rock can be computed.
利用放射性源的伽马射线轰击井眼周围的岩石，通过对反散射伽马射线计数，可以计算出地下岩石的密度。
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