a soft silvery-white tetravalent radioactive metallic element; isotope 232 is used as a power source in nuclear reactors; occurs in thorite and in monazite sands.
软质、银白色、放射
四价金属元
，
用作核反应能源，见于钍矿和独居石沙中。
a soft silvery-white tetravalent radioactive metallic element; isotope 232 is used as a power source in nuclear reactors; occurs in thorite and in monazite sands.
软质、银白色、放射四价金属元，用作核反应能源，见于钍矿和独居石沙中。
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