2B
- Created by: Shine.7
- Created on: 20-02-15 14:55
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- Phy 2B- Ionisation (movement of electrons)
- ALPHA
- big+heavy and slow moving
- strongly ionising
- doesn't penetrate
- mass 4 (HELIUM nuclei) Charge 2+
- V. DANGEROUS inside body(most ionising)
- BETA-electron
- penetrates moderately
- moderately ionising
- moves fast
- no mass and -1 charge(neg)
- GAMMA-wave
- SHORT wavelenght and HIGH frequency
- penetrates far
- weakly ionising
- no mass/charge
- ISOTOPES; same element with different n. of neutrons
- unstable isotopes are radioactive
- they decay into other elements and give out radiation
- DANGEROUS outside body(can get inside skin)
- passes straight through if inside body
- 1/2 LIFE; average time it takes for n. of nuclei in a radioactive isotope to 1/2
- =DECAY OF NUCLEUS
- the older a sample is-less radiation emmitted
- ALPHA
- LEAD absorbs all these radiations!!
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