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Radioactivity

Radioactivity. Name. symbol. Alpha. α. Beta. β -. positron. gamma. High Energy Photons. Radioactivity – Particles are emitted from an unstable nuclei. β +. Nuclear Equations:. The time taken for the activity, or the number of atoms remaining, to fall by half is called the half-life.

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Radioactivity

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  1. Radioactivity

  2. Name symbol Alpha α Beta β- positron gamma High Energy Photons Radioactivity – Particles are emitted from an unstable nuclei. β+

  3. Nuclear Equations:

  4. The time taken for the activity, or the number of atoms remaining, to fall by half is called the half-life = half-life

  5. Modified Graph lnN vs time

  6. Equations A = the activity in becquerels (Bq) at time t A0 = the original activity of the sample ΔN = number of disintegrations Δt = time interval N0= the original number of atoms in the sample. N = the number of atoms remaining after time t λ = the decay constant e = mathematical constant

  7. Deriving the half-life equation

  8. Example: A sample of radioactive isotope originally contains 1.0 x 1024 atoms and it has a half-life of 6.0 hours. Find: • The decay constant • The initial activity • The number of atoms remaining after 12 hours • The number of atoms remaining after 30 minutes

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