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| - | <p><font color="green" size="5">
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| - | L'Histoire de la radioactivité<br><HR>
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| - | <br/><br/>
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| - | Découverte en 1896 par <b>Henry Becquerel</b>, la radioactivité est un <i>phénomène physique naturel</i> au cours duquel des noyaux atomiques instables, (dits radioisotopes ), se transforment spontanément en dégageant de l'énergie sous forme de rayonnements divers, pour se transformer en des noyaux atomiques plus stables ayant perdu une partie de leur masse. Les rayonnements ainsi émis sont appelés, selon le cas, des rayons α, des rayons β ou des rayons γ.
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| - | </span>
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| - | <br> <br>
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| - | <br><br>
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| - | <p> <font color="green" size="5">
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| - | Qu'est ce qu'une centrale nucléaire ?<br><HR>
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| - | </font>
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| - | </p>
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