Key Stage 5
Meaning
Alpha decay is a type of radioactive decay where an unstable nucleus emits an alpha particle consisting of two protons and two neutrons.
About Alpha Decay
- Reduces the Atomic Number atomic number by 2 and the mass number by 4.
- Common in heavy elements like uranium and radium.
- Alpha particles have low penetration depth but high ionizing power.
Examples
- Radium-226 decays to radon-222 by emitting an alpha particle.
- Smoke detectors often use americium-241, which undergoes alpha decay.