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Nuclear Radiation
· Comes from the nucleus
· Nucleus contains neutrons and protons
· Electrons orbit around the edge
Electrons
Nucleus
Two isotopes of Carbon ­ both have 6 protons but different
numbers of neutrons.…read more

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3 Types of Radiation
Alpha
· Very ionising
· Not very penetrating
· Absorbed by paper or dead skin cells
· Stopped by only a few centimetres of air
Beta
· Slightly ionising
· Absorbed by aluminium or half a metre of air
Gamma
· Not very ionising
· Very penetrating
· Absorbed by lead or thick concrete…read more

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Efficiency
· Efficiency, as a percentage, is worked out by:
Useful energy out
x100
Total energy in
· The more efficient the object is the less energy is
wasted or dissipated in an wasteful way
· Be able to interpret energy flow diagrams…read more

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Background Radiation
The dose of
radiation is
measured in
sieverts Sv,
or
millisieverts
mSv.…read more

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Contamination Irradiation
This is when the source This is when a source
is inside the body, or on outside the body affects
your skin and will affect you ­ but only when you
you all of the time. are near it.…read more

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