Alpha Particles
| Formula / Notation | ⁴₂He (2p + 2n, charge = +2e) |
|---|---|
| Also Known As | Alpha radiation, α-ray, helium nucleus, ⁴He²⁺ |
What is Alpha Particles?
Alpha particles are positively charged particles identical to helium-4 nuclei, consisting of two protons and two neutrons bound together. They are emitted by heavy radioactive nuclei such as uranium and radium, and are the least penetrating but most ionising form of nuclear radiation.
Formula & Notation
Other Names / Synonyms: Alpha radiation, α-ray, helium nucleus, ⁴He²⁺
Properties & Characteristics
Uses & Applications
Safety Information
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
Key Facts
Frequently Asked Questions
Alpha particles are positively charged particles identical to helium-4 nuclei, consisting of two protons and two neutrons bound together. They are emitted by heavy radioactive nuclei such as uranium and radium, and are the least penetrating but most ionising form of nuclear radiation.
Used in radiometric dating (e.g., uranium-lead and thorium-lead methods), industrial thickness gauges, and as probes in nuclear reaction studies. Alpha-emitting radionuclides are investigated as payloads in targeted radiotherapy for cancer treatment.
External alpha exposure is largely harmless because particles are stopped by dead skin layers. Internal contamination from inhalation or ingestion is highly dangerous; strict radiological controls are required when handling open alpha sources.
The formula or notation for Alpha Particles is: ⁴₂He (2p + 2n, charge = +2e)