alpha beta gamma. lesson contents 1.what is radioactivity? 2.physical properties of , and ...
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AlphaBeta
Gamma
AlphaBeta
Gamma
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Lesson ContentsLesson Contents1. What is Radioactivity?2. Physical properties of ,
and 3. Penetrating power
of,and4. N v Zgraphs (for fun)5. Decay laws
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Early Pioneers in Radioactivity
Roentgen:
Discoverer of X-rays 1895
Becquerel:
Discoverer of Radioactivity
1896
The Curies:
Discoverers of Radium and
Polonium 1900-1908
Rutherford:
Discoverer Alpha and Beta
rays 1897
Villard:
Discovery of gamma rays 1898-1900
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What do we mean by Radioactivity?
Radioactive decay is the process in which an unstable atomic nucleus
loses energy by emitting radiation in the form of particles or
electromagnetic waves.
The general idea:
An unstable nucleus releases energy to become
more stable
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Radioactivity – Is it a Health Problem?
•The Alpha, Beta and Gamma particles all add
energy to the body’s tissues. It can alter
DNA.
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• http://www.youtube.com/watch?v=5oUagoF_viQ
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Alpha Radiation Alpha Radiation Alpha particles contain two protons and two neutrons
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Alpha RadiationAlpha Radiation has the same constitution as
a Helium nucleusAlpha particles may be written
as
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Beta-minus RadiationBeta-minus RadiationBeta-minus particles are electrons
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Beta-minus RadiationBeta-minus Radiation- is produced when a neutron
decaysBeta-minus particles may be
written as
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Beta-minus RadiationBeta-minus Radiation
- is produced when a neutron decays
The surplus mass is released as kinetic energy in the - and
as an antineutrino
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Hulk SMASH!!!!
• http://www.youtube.com/watch?v=jv95T-5bSYk
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Gamma RadiationGamma RadiationGamma rays are a form of electro-magnetic radiation
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Gamma RadiationGamma Radiation release is often associated
with or decayGamma rays remove energy from an unstable nucleus.
Has no mass and no charge.
O
O
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Penetrating powerPenetrating power
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N v Z graphsN v Z graphsA Graph of neutron number (N) against proton number (Z) helps to predict whether an isotope will emit or -
radiation
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N v Z graphsN v Z graphsIsotopes in this region emit particles to become more stable.N decreases by 2Z decreases by 2
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N v Z graphsN v Z graphsIsotopes in this region emit particles to become more stable.N decreases by 1Z increases by 1
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Decay laws - alphaDecay laws - alphaWhen an isotope emits an particle Its nucleon number decreases by 4 Its proton number decreases by 2For example:
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Decay laws – beta-minus
Decay laws – beta-minus
When an isotope emits a- particle Its nucleon number is unchanged Its proton number increases by 1For example:
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Decay lawsDecay lawsTry writing the nuclear equations for the decay of these isotopes
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Decay lawsDecay lawsAnswers
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2 6
14 28
50 82
126
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•Stability is not Stability is not usually achieved usually achieved in a single stepin a single step
•When a When a radioactive radioactive
nucleus reaches nucleus reaches a stable state by a stable state by a series of steps, a series of steps,
we call it a we call it a decay seriesdecay series
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Hulk sad the PowerPoint is over,
Hulk no wanna leave.