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becquerel
The becquerel (symbol Bq) (pronounced: ) is the SI derived unit of radioactivity. One Bq is defined as the activity of a quantity of radioactive material in which one nucleus decays per second. The Bq unit is therefore equivalent to an inverse second, s−1. The becquerel is named after Henri Becquerel, who shared a Nobel Prize with Pierre Curie and Marie Curie in 1903 for their work in discovering radioactivity.〔(【引用サイトリンク】title=BIPM - Becquerel )〕
==Definition==
1 Bq = 1 s−1〔
A special name was introduced for the reciprocal second (s−1) to represent radioactivity to avoid potentially dangerous mistakes with prefixes. For example, 1 µs−1 could be taken to mean 106 disintegrations per second: 1·(10−6 s)−1 = 106 s−1. Other names considered were hertz (Hz), a special name already in use for the reciprocal second, and fourier (Fr).〔 The hertz is now only used for periodic phenomena. Whereas 1 Hz is 1 cycle per second, 1 Bq is 1 aperiodic radioactivity event per second.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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