2 Welke soorten straling zijn er? 2
3.1 Wat zijn atomen? 3
3.2 De bouw van een atoom 4
3.3 De notatie van een atoom 5
4 Isotopen 6
5 Radioactief verval en vervalvergelijkingen 8
6 Halveringstijd of halfwaardetijd 11
, 1 Wat is straling?
Röntgen deed in 1895 een experiment met elektriciteit en ontdekte bij toeval straling.
Drie jaar later ontdekte Marie Curie de zeer actief stralende stof radium en bedacht
ze de term radioactiviteit. Straling heeft te maken met atomen: kleine bouwsteentjes
van werkelijk alles om ons heen.
1
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