1. Alpha Radiation:
- Consists of alpha particles, which are positively charged particles.
- Alpha particles are made up of two protons and two neutrons, identical to a helium nucleus.
- Alpha radiation has a very low penetrating power and can be stopped by a sheet of paper or a few centimeters of air.
- It is the least harmful type of radiation from an external source because it cannot penetrate the skin.
- However, alpha radiation can be dangerous if radioactive materials are ingested or inhaled because they can damage tissues from the inside.
2. Beta Radiation:
- Consists of beta particles, which are high-energy electrons or positrons (positively charged electrons).
- Beta particles have higher penetrating power compared to alpha particles. They can pass through paper but are stopped by a few millimeters of aluminum or a few meters of air.
- Beta radiation can cause skin burns and tissue damage, but it cannot penetrate the body deeply.
- It poses more significant health risks if radioactive materials are ingested or inhaled, exposing internal organs to beta radiation.
3. Gamma Radiation:
- Consists of high-energy photons (packets of electromagnetic energy) emitted by the decay of atomic nuclei.
- Gamma radiation has the highest penetrating power among the three types of radiation. It can easily pass through paper, aluminum, and even thick concrete walls.
- Gamma radiation can cause significant damage to living tissues and DNA, leading to radiation sickness, genetic mutations, and increased risk of cancer.
- It is essential to use proper shielding and safety precautions when working with gamma-emitting radioactive sources to minimize exposure and ensure radiation protection.
