radioactive isotope of thorium with mass number 228
an earlier name for the thorium isotope thorium-228, given by its discoverer Otto Hahn. It is a radioactive substance formed as one of series of products in the chain of radioactive decay of thorium. Its immediate predecessor in the chain is Actinium-228, and it decays by alpha emission to radium-224 with a half-life of 1.91 years. The name radiothorium was given prior to the full understanding of the nature of isotopes of elements.
The radioactive isotope thorium-228
The numerical value of radiothorium in Chaldean Numerology is: 8
The numerical value of radiothorium in Pythagorean Numerology is: 7
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"radiothorium." Definitions.net. STANDS4 LLC, 2017. Web. 23 Apr. 2017. <http://www.definitions.net/definition/radiothorium>.