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physics > Radiation > Flashcards

Radiation Flashcards

1
Q

What is alpha particles made up of?

A

A helium nucleus (2 protons 2 neutrons)

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2
Q

What is a beta?

A

Fast moving electron

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3
Q

What is gamma radiation!?

A

EM wave

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4
Q

What is the definition of half life?

A

The time it takes for her count rate of the original substance to fall to half its original value

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5
Q

What is the least penetrating type of radiation?

A

Alpha

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6
Q

What is the most penetrating type of radiation?

A

Gamma

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7
Q

What can stop alpha radiation?

A

Alpha

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8
Q

What can stop beta radiation?

A

A few millimetres of aluminium

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9
Q

What can stop gamma rays?

A

Few cm of lead

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10
Q

How does radioactive emissions happen?

A

From an unstable nucleus because of the imbalance between number of protons and neutrons

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11
Q

Why can gamma radiation be good for treating cancer?

A

Can pass out of the body without ionising

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12
Q

What contributes to background radiation?

A

Rocks
Radon
Sun
Certain foods

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physics (4 decks)

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