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physics > Radiation > Flashcards

Radiation Flashcards

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1
Q

Alpha particles are ……

A

Alpha particles are HELIUM NUCLEI - made up of two neutrons and two protons.

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2
Q

Beta particles are ……

A

Beta particles are HIGH SPEED ELECTRONS - released by a nucleus.

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3
Q

Gamma rays are ……

A

Gamma rays are ELECTROMAGNETIC WAVES with a SHORT WAVELENGTH - released by a nucleus.

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4
Q

How far can alpha radiation penetrate?

A

Alpha particles can only travel through a few cm of air and are absorbed by a sheet of paper.

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5
Q

How far can beta radiation penetrate?

A

Beta particles can travel through air for a few metres and are absorbed by a 5mm sheet of aluminium.

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6
Q

How far can gamma radiation penetrate?

A

Gamma waves can travel a long distance through air are absorbed by thick sheets of lead or metres of concrete.

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7
Q

How ionising are alpha particles?

A

Alpha particles are strongly ionising.

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8
Q

How ionising are beta particles?

A

Beta particles are moderately ionising.

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9
Q

How ionising are gamma waves?

A

Gamma waves are weakly ionising.

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physics (7 decks)

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