An atom consists of protons, neutrons, and electrons.

The symbol \( ^{14}_6C \) represents an isotope of carbon with 14 protons.

The atomic number is the number of neutrons in an atom.

Alpha particles are more penetrating than gamma rays.

Beta particles are negatively charged.

Gamma rays have no mass and no charge.

Alpha particles can be stopped by a sheet of paper.

A Geiger-Müller detector can detect ionising radiations.

Background radiation comes only from space.

The activity of a radioactive source increases over time.

The half-life of a radioactive isotope is the time it takes for half of the radioactive atoms to decay.

Radioactivity is used in both industry and medicine.

Contamination and irradiation are the same thing.

Ionising radiation can cause mutations in living organisms.

Nuclear fission and nuclear fusion are the same process.

The fission of U-235 produces two radioactive daughter nuclei.

Control rods in a nuclear reactor absorb neutrons.

Nuclear fusion occurs at low temperatures and pressures.

Fusion is the energy source for stars.