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Encyclopedia > Curie

The curie (symbol Ci) is a former unit of radioactivity, defined as 3.7×1010 decays per second. This is roughly the activity of 1 gram of the radium isotope 226Ra, a substance studied by the pioneers of radiology, Marie and Pierre Curie (the unit is named after Pierre Curie). The curie has been replaced by an SI derived unit, the becquerel (Bq), which equates to one decay per second. Therefore 1 curie is 37 gigabecquerels (GBq) exactly and 1 Bq = 2.7027×10-11 Ci (for greater accuracy, the "027" is a repeating decimal). Radioactive decay is the set of various processes by which unstable atomic nuclei (nuclides) emit subatomic particles. ... Radioactive decay is the set of various processes by which unstable atomic nuclei (nuclides) emit subatomic particles (radiation). ... The second (symbol s) is a unit for time, and one of seven SI base units. ... The gram or gramme, symbol g, is a unit of mass, and is defined in the SI system of units as one one-thousandth of a kilogram (i. ... General Name, Symbol, Number radium, Ra, 88 Chemical series alkaline earth metals Group, Period, Block 2, 7, s Appearance silvery white metallic Atomic mass (226) g/mol Electron configuration [Rn] 7s2 Electrons per shell 2, 8, 18, 32, 18, 8, 2 Physical properties Phase solid Density (near r. ... Isotopes are forms of an element whose nuclei have the same atomic number–-the number of protons in the nucleus--but different atomic masses because they contain different numbers of neutrons. ... Chest X-ray Radiology traditionally was the branch of medical science dealing with the medical use of X-rays emitted by X-ray machines or other such radiation devices for the purpose of obtaining visual information as part of medical imaging. ... Marie Curie, one of the few people to win two Nobel Prizes in different fields, was one of the most significant researchers of radiation and its effects as a pioneer of radiology. ... Pierre Curie Pièrre Curie (May 15, 1859 – April 19, 1906) was a pioneer in the study of crystallography, magnetism, piezoelectricity and radioactivity. ... SI derived units are part of the SI system of measurement units and are derived from the seven SI base units. ... The becquerel (symbol Bq) is the SI derived unit of radioactivity, defined as the activity of a quantity of radioactive material in which one nucleus decays per second. ... A recurring decimal is an expression representing a real number in the decimal numeral system, in which after some point the same sequence of digits repeats infinitely many times. ...


 
 

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