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Meia-vida é o tempo que leva para que uma quantidade de uma substância, seja um elemento radioativo, um medicamento, ou a concentração de um reagente químico, se reduza pela metade. Por exemplo, em física nuclear, a meia-vida refere-se ao tempo de decaimento de um isótopo radioativo, enquanto na medicina, o termo descreve o tempo para que a concentração de um fármaco diminua pela metade no corpo
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