Radioactivity

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Last updated 11:33 AM on 5/9/26
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9 Terms

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Radioactivity

The spontaneous breakdown of an unstable nucleus with the mission of one or more types of radiation

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Who discovered radioactivtiy

Henri Becquerel

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What elements did Curies discover

Polonium, radium

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Alpha particles

2protons and 2neutrons, few cm of air, americium-241, smoke detector

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Beta particles

High energy electrons emitted from nucleus, 5mm of Al, carbon-14, carbon dating

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Gamma rays

Electromagnetic radiation, few cm lead, cobalt-60, killing tumours

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Radioisotopes

Isotopes that are radioactive

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Half life

The time taken for half of the nuclei to decay

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Uses of radioactivity

Archaeological ( carbon dating using carbon-14 ), Medical ( cobalt-16 used to kill tumours and sterilise surgical equipment ), food irradiation ( cobalt-60 used to increase shelf life by killing backer and fungi on food slowing down decay )