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Question 1

Types of radiation

Answer 1

Alpha
Beta
Gamma

Question 2

Alpha

Answer 2

Slow moving protons and neutrons

Question 3

Beta

Answer 3

Fast moving electrons

Question 4

Gamma

Answer 4

High energy electromagnetic wave

Question 5

Alpha stopped by

Answer 5

Thin sheet of paper
Few cm of air

Question 6

Beta is stopped by

Answer 6

Thin sheet of aluminium
Several meters of air

Question 7

Gamma is stopped by

Answer 7

Thick sheet of lead

Question 8

Why an element is radioactive

Answer 8

Has unstable nucleus with unstable amount of protons and neutrons

Question 9

Why an alpha source is used in the pacemaker rather than gamma or beta source

Answer 9

Alpha will not escape the pacemaker as it’s made of metal, beta and gamma would escape and damage tissue

Question 10

Reason why it’s important for radioactive source is long lasting

Answer 10

So it won’t need replaced often

Question 11

Sources of background radiation

Answer 11

Carbon 14 from inside living organisms

Radioactive gas (radon) emitted from granite rock

Potassium in some food

Waste products from nuclear power stations

Medicine in hospital

Cosmic rays

Question 12

Background radiation

Answer 12

Radiation that is all around and always present

Question 13

Ionisation

Answer 13

the gain and loss of electrons to form an ion

Question 14

Half life

Answer 14

Time taken for its activity to fall by half