Thorium

(noun.) 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.

录入:萨姆纳

• Again, it is conjectured that bismuth is the end-product of the thorium series. 李贝. 西洋科学史.
• He made a cylindrical mantle of thin fabric, and then soaked it in a solution of thorium and cerium until it became saturated with the chemical. 伯莎M.克拉克. 科学通论.
• Schmidt published the results of their studies of the radiations of the salts o f thorium. 李贝. 西洋科学史.
• When certain substances, such as thorium and cerium, are heated, they do not melt or vaporize, but glow with an intense bright light. 伯莎M.克拉克. 科学通论.
• The mantle thus impregnated with thorium and cerium is placed on the gas jet, but before the gas is turned on, a lighted match is held to the mantle in order to burn away the thin fabric. 伯莎M.克拉克. 科学通论.

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