Gamma radiation can be significantly reduced by…
Paper
Aluminium
Lead
What form of radiation is emitted by nuclei with too many neutrons?
Alpha
Gamma
Beta
Gamma radiation is...
An electromagnetic wave
A helium nucleus
An electron
Which form of radiation has the highest ionising power?
What causes an atom's nucleus to become unstable?
Too many or too few neutrons in the nucleus
More electrons than protons
Fewer electrons than protons
What is the activity of a source that emits 1,200 particles per minute?
1,200 Bq
20 Bq
72,000 Bq
Uranium 238 emits an alpha particle to become what nucleus?
Thorium-234
Thorium-239
Thorium-236
An alpha particle is…
Which type of radiation can reach the furthest?
What fraction of a radioisotope has decayed after two half-lives? - Higher
One quarter
All of it
Three quarters