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# Invoer
a_0 = float(input("beginactiviteit: "))
t = int(input("halfwaardetijd: "))
a_veilig = float(input("veilige drempel: "))
# Berekeningen (simulatie)
# Uitvoer
print(f"halveringen | {halveringen}")
print(f"dagen | {totaal_dagen}")
print(f"activiteit (Bq)| {a:.2f}")