About Radioactive Decay
Radioactive decay is the process by which an unstable atomic nucleus loses energy by emitting radiation, transforming into a more stable state. The most common types are alpha, beta, and gamma decay, each releasing different particles or energy.
Forces Involved:
- Weak nuclear force - responsible for beta decay.
- Electromagnetic & strong nuclear forces - govern alpha and gamma decay
Types of Radioactive Decay
| Type of Decay |
What is Emitted |
Example |
Effect on Nucleus |
| Alpha (α) |
Helium nucleus (2 protons + 2 neutrons) |
Uranium-238 to Thorium-234 |
Mass decreases significantly |
| Beta (β) |
Electron (βΓ’ΒΒ») or positron (βΓ’ΒΒΊ) |
Carbon-14 to Nitrogen-14 |
Proton/neutron ratio changes |
| Gamma (γ) |
High-energy photon (electromagnetic radiation) |
Cobalt-60 to Cobalt-60* |
Energy decreases, no change in mass/charge |
Applications of Radioactive Decay
- Medicine: Radiation therapy for cancer, diagnostic imaging (PET scans).
- Archaeology: Carbon dating (using C-14) to determine the age of fossils and artifacts.
- Energy: Nuclear power generation relies on controlled radioactive decay.
- Environmental Science: Tracking pollutants and studying geological processes.
Risks & Safety
- Radiation exposure can damage living tissue, causing burns, mutations, or cancer.
- Shielding: Lead or concrete is used to block radiation.
- Regulation: Strict safety protocols in nuclear plants, hospitals, and labs.
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