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Alpha particles are big compared to alpha and beta particels so they are easily stopped by paper

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the half life of an radioactive isotope of an chemical element determines how radioactive that element is over an given time period

e.g:
- carbon-14 has a half life of 5700 years (less radioactive)
- francium-22 has a half life of 22 minutes (very radioactive)

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alpha radiation is dangerous and most harmful radiation. alpha particles can damage living tissues.

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It is a type of energy which is emmitted when it is striked and the release of energy Travels ina the form of electromagnetic radiations.
There are 3 types of ionizing  radiations
Alpha
Beta
Gamma
Alpha: it is made up of 2 protons and 2 neutrons or you can say the neucleus of He. The size is a little big so it can pass through paper.
Beta: neta particles are heigh energy electrons and as it is just an electron so it can pass through paper but it is stopped by aluminium.
Gamma rays:  they are high energy photon and it can travel long distances and is mostly stopped by a very thich peice of lead.

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onizing radiation  interact  with a DNA molecule's atoms

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onizing radiation  interact  with a DNA molecule's atoms

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Alpha particles: it loses two protons and two neutrons.

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Sedra Amer
1.Alpha particles
2.Beta
3. Gemma
Alpha is made from helium nucleus,2 protons and 2 neutrons. They are relatively big, heavy and slow moving. Alpha particles have the shortest range in air so they are blocked by paper.
Beta is made from high speed electron. They are small and fast moving. Beta are blocked by thin aluminium.
Gemma is made from high energy wave. Gemma Ray have no charge and no mass. They are travels a long way it has longest range in air. Gemma rays are blocked by thick lead.

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Gamma rays and x-rays

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Alpha is stopped by air/ paper
Beta is stopped by aluminium
Gamma is stopped by thick lead/ concrete.
When a charged particle comes near another atom it can pull electrons off the atoms.
This slows the particle down, the atom is then called an ion if it has lost electrons, it is a positive ion

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Alpha particles: Made of two protons and two, can travel through Cm, it can be stopped by air or paper.

Beta particles: Made if high speed electron, can travel through m and can be stopped by aluminium.
Gamma particles:

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Alpha

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Beta
They can be stopped by skin and can only travel a small way in the air

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Rays of alpha particles are highly ionising because they go far much deeper into the human body compared to particles of gamma rays

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which are essentially electrons

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edita alpha particles - consist of two protons and two neutrons, it is hihgly ionising because of double positive charge. stopped by paper

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edita alpha particles - consist of two protons and two neutrons, it is hihgly ionising because of double positive charge. stopped by paper

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beta particles - it is ionised ore then gamma but less then then alpha. the higher the ionising effect the greater the damage to living tissue. stopped by aluminium/metal
gamma ray - can pass through human skin easily,
X ray
Danger:
ionising radiation causes burns different types of cancer . dermatitis, damage of blood cells, can damage human skins and damage bones.