Principles and Characteristics of Gamma Irradiation Technology
Principle Of Sterilization
Gamma Irradiation: Principles and Characteristics
Gamma rays emitted by cobalt-60 (Co-60) are highly penetrating ionizing radiation. They damage microbial DNA and cellular structures to achieve sterilization.
1. Co-60 Source
Cobalt-60 emits Gamma rays (γ-rays).
2. Gamma Ray
Highly penetrating ionizing radiation passes through packaging and products.
3. Product Irradiation
Gamma rays penetrate the product and act on microorganisms.
4. DNA & Cellular Damage
Microbial DNA and essential cellular structures are damaged.
5. Sterilization
Microorganisms are inactivated, helping ensure product safety.
How Gamma Rays Inactivate Microorganisms
Direct Action
Gamma radiation acts directly on microbial DNA, breaking molecular bonds and damaging its structure. This prevents microorganisms from reproducing.
Indirect Action
Gamma radiation interacts with water molecules inside cells, generating free radicals and other reactive species, such as ·OH, H·, and H₂O₂. These damage DNA, proteins, and cellular structures, helping inactivate microorganisms.
Key Characteristics of Gamma Irradiation
High Penetration
Gamma rays penetrate products and packaging materials.
Ambient-Temperature Processing
The irradiation process does not rely on high temperatures or high pressure.
No Induced Radioactivity
Irradiation does not make products radioactive.
Treatment in Final Packaging
Products can be irradiated in their final packaging, with various packaging formats supported.
High Penetration · Sterilization in Final Packaging
No Chemical Sterilant Residues · Ambient-Temperature Processing
No Chemical Sterilant Residues · Ambient-Temperature Processing