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Becquerel
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<p>The becquerel is the unit of <a href="/facts/Radioactive_decay/Ya6FVjt4">radioactivity</a> in the <a href="/facts/International_System_of_Units/S7YLglNz">International System of Units</a> (SI). One becquerel is defined as an <a href="/facts/Activity_(radioactivity)/Ya6FVjt4">activity</a> of one per <a href="/facts/Second/jtFxnJXx">second</a>, on average, for aperiodic activity events referred to a radionuclide. For applications relating to human health this is a small quantity, and <a href="/facts/SI_multiple/Y2MzkaeL">SI multiples</a> of the unit are commonly used. </p><p>The becquerel is named after <a href="/facts/Henri_Becquerel/wN7DSsVL">Henri Becquerel</a>, who shared a <a href="/facts/Nobel_Prize_in_Physics/o6w1nCbr">Nobel Prize in Physics</a> with <a href="/facts/Pierre_Curie/Sbtlw2xj">Pierre</a> and <a href="/facts/Marie_Curie/EGjeuJ14">Marie Curie</a> in 1903 for their work in discovering radioactivity. </p>