mesothorium

[mez-oh-thawr-ee-uhm, -thohr-, mes-, mee-zoh-, -soh-]

noun

Chemistry.

1. one of two radioactive decay products of thorium, an isotope of radium or actinium.

mesothorium

/ ˌmɛsəʊˈθɔːrɪəm /

noun

1. obsolete,  physics either of the two radioactive elements which are decay products of thorium. Mesothorium I is now called radium-228. Mesothorium II is now called actinium-228

Example Sentences

Each tiny bottle contained about a millionth of a gram of radium, the same amount of mesothorium.

Read more on Time Magazine Archive

The dogs are injected with graduated amounts of plutonium, radium, radiothorium or mesothorium.

Read more on Time Magazine Archive

The paint contained radium and mesothorium salts which continually shoot out Alpha, Beta, Gamma rays.

Read more on Time Magazine Archive

From thorium minerals a body was separated called mesothorium, which was analogous to radium.

Read more on Project Gutenberg

The greatly extended use of radium, together with the distinctly limited character of the world's known radium supplies, has led to some concern; and considerable investigation has been made of the possibilities of mesothorium as a substitute for radium in luminous paints.

Read more on Project Gutenberg