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Radiation
Discovery and Chemistry of Radiation
Question | Answer |
---|---|
French scientist who discovered radiation: | Henri Becquerel |
What elemental salt was Becquerel using when he discovered radiation | Uranium |
Definition of Radiation | Radiation is the spontaneous breaking down of unstable nuclei with the emission of one or more types of radiation |
Husband and wife who discovered 2 new radioactive elements: | Pierre and Marie Curie |
Uranium ore the Curies were trying to purify? | Pitchblende |
2 elements discovered by the Curies | Polonium and Radium |
3 type so f Radiation: | Alpha, Beta and Gamma |
Alpha Particle: Penetrating Power, Charge, Composition | Stopped by a sheet of paper or a few cm of air, positively charged Made up of 2 protons and 2 neutrons, He nucleus |
Beta Particle: Penetrating Power, Charge, Composition | Stopped by 5mm Al, Negatively charged, neutron decomposed to form one proton and one electron. Proton kept, electron ejected. Made up of an electron |
Gamma Radiation: Penetrating Power, Charge, Composition | Stopped by a few feet of concrete or a thick sheet of lead. No charge, not a particle, composed of pure high energy electromagnetic energy |
Use of alpha radiation | Americium 241 found in smoke detectors |
What happens the Atomic and Mass number of an element after alpha radiation? | Atomic decreases by 2, Mass number decreases by 4 |
What happens the Atomic and Mass number of an element after beta radiation? | Atomic number increases by 1, Mass number stays the same |
The changing of one element to another through radiation | Transmutation |
Used to detect the presence of radiation | Geiger-Muller tube |
Half-life | The half-life of an element is the time taken for half of the neclei in any given sample to decay |
Radio-isotope | A radio-isotope is an isotope of a radioactive substance |
Uses of radio-isotopes | Medicine to kill cancer cells Archaeology to date organic material Food irradiation to kill germs Used to detect leaks in pipes |