Radioactiviy Mindmap

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  • Radioactivity
    • Atomic Structure
      • Dalton Model
        • Tiny, indivisible spheres
      • Plum Pudding Model
        • A ball of positive charge with negative electrons
      • Nuclear Model
        • The mass of an atom is concentrated in it's nucleus. It is mainly empty space
      • Bohr Model
        • Electrons orbit the nucleus at specific distances
      • Radius of Atom
        • 1x10^-10m
      • Radius of Nucleus
        • 1/10000th of atom
    • Isotopes and Ions
      • Iosotope
        • Different version of the same element. Same number of protons, different number of neutrons
      • Ion
        • An atom that has lost or gained an electron wither making it positive or negative
        • Ionising Power
          • Making an atom into and ion
          • The ionising power and range in air are indirectly proportionate
    • Types of Radioactive Decay
      • Alpha
        • 2 protons and 2 neutrons. Loses 2 from proton number and 4 from mass number
      • Beta
        • A neutron changes to a proton and an electron, which is ejected. The mass number doesn't change but the proton number increases by 1
      • Gamma
        • Electromagnetic waves to lose extra energy after alpha or beta decay.
    • Penetrating Power
      • Alpha
        • Stopped by thin paper
      • Gamma
        • Some passes through thick lead
    • Range in Air
      • Alpha
        • A few centimetres
      • Beta
        • A few metres
      • Gamma
        • A very long way
    • Half-life
      • The time it takes for half of the radioactive atoms to decay
    • Number of Emissions per Second
      • Activity
      • Counts per second (cps)
      • Becquerels (Bq)
    • Contamiation and Irradiation
      • Contamination
        • The unwanted presence of radioactive isotopes on other materials
      • Danger of Contamination
        • The decay of atoms releasing alpha, beta or gamma radiation
      • Irradiation
        • Takes place if an object is exposed to a source emitting radiation
      • Danger of Irradiation
        • Untitled

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