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However, the 231 Pa (with a half-life of 3.27 × 10 4 years) formed via (n,2n) reactions with 232 Th (yielding 231 Th that decays to 231 Pa), while not a transuranic waste, is a major contributor to the long-term radiotoxicity of spent nuclear fuel. While 231 Pa can in principle be converted back to 232
The University of Victoria (UVic) is a public research university located in the municipalities of Oak Bay and Saanich, British Columbia, Canada. [ 10 ] [ 11 ] [ 12 ] Established in 1903 as Victoria College , the institution was initially an affiliated college of McGill University until 1915.
Its decay product, 231 Pa, gradually precipitates to the bottom, so that its concentration first increases with depth and then stays nearly constant. 231 Pa decays to 227 Ac; however, the concentration of the latter isotope does not follow the 231 Pa depth profile, but instead increases toward the sea bottom.
A school timetable is a calendar that coordinates students and teachers within the classrooms and time periods of the school day. Other factors include the class subjects and the type of classrooms available (for example, science laboratories).
Immunochemistry – is a branch of chemistry that involves the study of the reactions and components on the immune system. Chemical oceanography – study of ocean chemistry: the behavior of the chemical elements within the Earth's oceans. Mathematical chemistry – area of study engaged in novel applications of mathematics to chemistry. It ...
Physical chemistry is the study of macroscopic and microscopic phenomena in chemical systems in terms of the principles, practices, and concepts of physics such as motion, energy, force, time, thermodynamics, quantum chemistry, statistical mechanics, analytical dynamics and chemical equilibria.
An image from John Dalton's A New System of Chemical Philosophy, the first modern explanation of atomic theory.. This timeline of chemistry lists important works, discoveries, ideas, inventions, and experiments that significantly changed humanity's understanding of the modern science known as chemistry, defined as the scientific study of the composition of matter and of its interactions.
According to a study of 5,743 former users conducted by a plaintiff's expert cardiologist, damage to the heart valve continued long after stopping the medication. [25] Of the users tested, 20% of women, and 12% of men were affected. For all ex-users, there was a 7-fold increase of chances of needing surgery for faulty heart valves caused by the ...