Fichas
Radioactivity
Fichas del conjunto (15)
- 1What is Alpha ?Positive charged helium nuclei.
It does not go through air & paper. - 2Where is alpha used and how?Smoke detectors, the alpha radiation is placed close to two electrons, as the source causes ionisation a current flows between the electrodes. If there is a fire the smoke absorbs the radiation and the current stops.
- 3What is beta?Negative charged electrons. It does not go through aluminium (Al).
- 4Where is beta used and how?paper thickness gauges. The thicker the material, the more radiation is absorbed and the less radiation reaches the detector. It then sends signals to the equipment that adjusts the thickness of the material.
- 5What is gamma radiation?Uncharged electromagnetic waves. It does not go through lead (Pb).
- 6Where and how is gamma radiation used?Radio theraphy, sterilising medical equipment etc
- 7How is radiation measured?geiger (muller) tube, counts the numbers of rays given out per second
- 8Tracers?Gamma or Beta radiation (passes out the body quickly) the radiation is inserted and followed with an external detector e.g heart blockage
- 9What happened to radioactivity over time?It decreases at the nuclei decays into other products e.g soil
- 10What is radiation?radiation is emitted by unstable nuclei of isotopes that become more stable by doing this.
- 11What is background radiation?Naturally occurring in the environment.
-cosmic rays
-rocks/soil
-air (radon gas) - 12How do alpha particles ionise?they take electrons from air particles
- 13What is half live?Amount of time it takes for the nucleus to half.
- 14Does radioactivity ever reach zero?No
- 15how do beta particles ioniseadd electrons to air molecules.
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- Descripción
- GCSE Physics Fichas sobre Radioactivity, creado por ImanO el 08/12/2013.
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- ImanO
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