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The four naturally occurring isotopes allow a standard atomic weight to be given. Twenty-nine radioisotopes of protactinium have been characterized, ranging from 211 Pa to 239 Pa. The most stable isotope is 231 Pa with a half-life of 32,760 years, 233 Pa with a half-life of 26.967 days, and 230 Pa with a half-life of 17.4
The element was first identified in 1913 by Kazimierz Fajans and Oswald Helmuth Göhring and named "brevium" because of the short half-life of the specific isotope studied, protactinium-234m. A more stable isotope of protactinium, 231 Pa, was discovered in 1917/18 by Lise Meitner in collaboration with Otto Hahn, and they named the element ...
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.
Pages in category "Isotopes of protactinium" The following 38 pages are in this category, out of 38 total. This list may not reflect recent changes. ...
The most important isotopes are 231 Pa and 233 Pa, which is an intermediate product in obtaining uranium-233 and is the most affordable among artificial isotopes of protactinium. 233 Pa has convenient half-life and energy of γ-radiation , and thus was used in most studies of protactinium chemistry.
The actinide series is a group of chemical elements with atomic numbers ranging from 89 to 102, [note 1] including notable elements such as uranium and plutonium.The nuclides (or isotopes) thorium-232, uranium-235, and uranium-238 occur primordially, while trace quantities of actinium, protactinium, neptunium, and plutonium exist as a result of radioactive decay and (in the case of neptunium ...
Main isotopes of protactinium; Main isotopes [1] Decay; abundance half-life (t 1/2) mode product; 229 Pa synth: 1.5 d:
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