1. Radioactivity Background radiation Revision of the atom Types and
properties
Using absorbers
To make badges
Summary

2. Background radiation Comes from radioactive substances which are
all around us.
The ground, the air, buildings, food and water.
Cosmic rays (radiation that reaches us from space)
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3. Use the following information to work
out your own personal dose of radiation
during the last year
Doses of radiation are measured in milli Sieverts or mS for short
You may see these units used in questions but you don’t have
To answer questions about them!
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4. m c s o s a i y c r
We all get 250 units of cosmic radiation each year.
You get 1 unit more for every 30m you live above sea level.
These come from the sun and from space
Keep your running total in these boxes
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5. previous
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6. Buildings There are radioactive substances in stone, brick and
concrete. This gives you about 350 units of radiation a year.
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7. previous
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8. Radioactive substances dissolve. They get in
plants, animals that eat the plants and into
water.
This gives you about 300 units of radiation each year.
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9. Radiation that depends on what you do
Other sources of radiation
Dose
Dental X-ray
20 units each time
Hospital X-ray
50 units each time
Flying
4 units per hour
If you live within a mile of a nuclear power station, you
should add an extra 5 units a year to your radiation dose.
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10. The average radiation dose in Britain is about 2500 units each year
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11. natural sources of radiation and the dose due to man made radiation
The information below shows the annual dose of a person living in Cornwall.
Use this information to work out the total dose of this person for 1 year due to
natural sources of radiation and the dose due to man made radiation
THE GROUND = 50
BUILDINGS = 350
THE AIR = 3600
DENTAL X-RAYS = 95
HOSPITAL X-RAYS = 300
NUCLEAR POWER STATIONS = 5
Now calculate the fraction of the dose the person receives which is man made

12. natural sources of radiation and the dose due to man made radiation
The information below shows the annual dose of a person living in Cornwall.
Use this information to work out the total dose of this person for 1 year due to
natural sources of radiation and the dose due to man made radiation
ANSWERS
THE GROUND = 50
BUILDINGS = 350
THE AIR = 3600
DENTAL X-RAYS = 95
HOSPITAL X-RAYS = 300
NUCLEAR POWER STATIONS = 5
Now calculate the fraction of the dose the person receives which is man made

13. Revision of the atom
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14. - - - + -

15. Answers - - - + -

16. PARTICLE MASS CHARGE Proton Neutron Electron
Test your knowledge of the atom by filling in this table
PARTICLE MASS CHARGE
Proton
Neutron
Electron
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17. PARTICLE MASS CHARGE Proton 1 +1 Neutron 1 0 Electron negligable -1
Answers
PARTICLE MASS CHARGE
Proton
Neutron
Electron negligable
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18. Radioactivity comes from the of atoms
Types and properties
Radioactivity comes from the
of atoms
There are _________ types of radioactivity.
particles.
rays.
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19. Radioactivity comes from the ________ of atoms
Types and properties
Radioactivity comes from the ________
of atoms
There are _________ types of radioactivity.
A______ particles.
B____ particles.
G______ rays.
nucleus
three
LPHA
ETA
AMMA
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