What can significantly reduce gamma radiation?
Paper
Aluminium
Lead
What form of radiation is emitted by nuclei with too many neutrons?
Alpha
Gamma
Beta minus
What is gamma radiation?
An electromagnetic wave
A helium nucleus
An electron
Which form of radiation has the highest ionising power?
Beta
What is a positron?
An antimatter electron
A fast-moving electron
A \(\beta\)- particle
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
What is an alpha particle?
Which type of radiation can reach the furthest?
What fraction of a radioisotope has decayed after two half-lives?
One quarter
All of it
Three quarters