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This is a list of radioactive nuclides (sometimes also called isotopes), ordered by half-life from shortest to longest, in seconds, minutes, hours, days and years. Current methods make it difficult to measure half-lives between approximately 10 −19 and 10 −10 seconds.
A further 10 nuclides, platinum-190, samarium-147, lanthanum-138, rubidium-87, rhenium-187, lutetium-176, thorium-232, uranium-238, potassium-40, and uranium-235 have half-lives between 7.0 × 10 8 and 4.83 × 10 11 years, which means they have experienced at least 0.5% depletion since the formation of the Solar System about 4.6 × 10 9 years ...
"More powerful than uranium"; used by men from the Moon. Metal X (Rovolon) E. E. Smith's SkyLark series: An element discovered that facilitates conversion of the energy in metals (copper or uranium) and uses it as a propulsive or attractive force. The Norlaminians had already discovered this metal and named it Rovolon.
Branching fractions from the P3/2 and P1/2 states in 88 Sr+. In the field of atomic, molecular, and optical physics, a branching fraction refers to the probability of decay to a specific lower-lying energy states from some excited state.
In the first six periods this does not make a difference to the relative order, but in the seventh period it does, so the seventh-period elements have been excluded. (In any case, the typical oxidation states for the most accessible seventh-period elements thorium and uranium are too high to allow a direct comparison.) [ 11 ]
This is an accepted version of this page This is the latest accepted revision, reviewed on 2 February 2025. American composer and producer (born 1984) Lena Raine Raine in 2018 Background information Also known as Lena Chappelle Kuraine Born (1984-02-29) February 29, 1984 (age 40) Seattle, Washington, U.S. Genres Soundtrack electronic Occupations Composer producer game designer Labels Radical ...
The roentgen or röntgen (/ ˈ r ɛ n t ɡ ə n,-dʒ ə n, ˈ r ʌ n t-/; [2] symbol R) is a legacy unit of measurement for the exposure of X-rays and gamma rays, and is defined as the electric charge freed by such radiation in a specified volume of air divided by the mass of that air (statcoulomb per kilogram).
A 1 inch tall uranium fuel pellet is equivalent to about 1 ton of coal, 120 gallons of crude oil, or 17,000 cubic feet of natural gas. [15] In light-water reactors , 1 kg of natural uranium – following a corresponding enrichment and used for power generation– is equivalent to the energy content of nearly 10,000 kg of mineral oil or 14,000 ...