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LED purple light has a certain effect on sterilization and disinfection

Date：

2024-05-31

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### **Ultraviolet Radiation Classification and Safety Considerations**

Ultraviolet (UV) radiation is categorized into three primary bands based on wavelength:
- **UVA (380-320 nm)**: Long-wave ultraviolet radiation
- **UVB (320-280 nm)**: Medium-wave ultraviolet radiation
- **UVC (<280 nm)**: Short-wave ultraviolet radiation

Most commercial UV disinfection lamps utilize 254 nm UVC radiation from mercury lamps for sterilization. This particular wavelength is highly effective for disinfection due to its shorter wavelength and higher energy content. However, these same properties also pose significant health hazards when proper protective measures are not implemented:

#### **Health Risks of UVC Exposure**
1. **Acute Exposure Effects**:
- Exposure of eyes and skin for **>3 minutes** may exceed safety limits established by the World Health Organization (WHO) and the International Commission on Non-Ionizing Radiation Protection (ICNIRP).
- **15 minutes of direct exposure** can cause:
- Corneal damage leading to photokeratitis
- Sudden onset of severe ocular pain
- Foreign body sensation in eyes
- Photophobia, lacrimation, and blepharospasm

2. **Chronic Exposure Consequences**:
- Permanent ocular damage
- Severe skin burns
- Increased risk of skin carcinoma

#### **Safety Recommendations**
- Always implement appropriate shielding when operating UVC disinfection systems
- Never view UVC sources directly
- Ensure proper personal protective equipment (PPE) is worn by operators
- Install safety interlocks to prevent accidental exposure

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