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abstraction > mathematical concept > unit > radioactivity unit

radioactivity unit
subject			fact

radioactivity unit	is a unit of radioactivity
	is a kind of unit
unit	has historical origin
	represents

Kinds of radioactivity unit :

• becquerel (9 facts) (Bq) - Unit of radioactivity; 1 becquerel represents one disintegration, or other nuclear transformation, per second.
• curie (4 facts) - A unit of radioactivity which is now defined as the quantity of any radioactive nuclide undergoing 37.00 × 10⁹ disintegrations per second. The unit was adopted at a Radiography Conference in Brussels in 1910 when it was defined as the radioactivity associated with the quantity of radon in equilibrium with one gram of radium. The present definition, which refers to a unit of the same size but described in terms independent of the disintegration of radon, was agreed at the Copenhagen meeting of the International Commission on Radiological Units in July 1953. The unit is named after Pierre Curie (1859-1906), one of the discoverers of radium. The curie is too large for normal laboratory work where the radioactivity is of the order of millicuries. The number of disintegrations occurring per second is called the activity of a sample and a unit for this was originally the reciprocal second but this has been superseded by the curie., Unit of radioactivity.
• gray (6 facts) (Gy)
• rad (3 facts) - Unit of radiation, equal to 100 ergs of ionizing energy absorbed per gram of absorber.
• sievert (6 facts) (Sv)