UV Dosage for Disinfection

Viruses, bacteria, mold, and other pathogens are now stopped dead in their tracks with XtraLight's UVC High Power Ultraviolet Disinfection System. Follow these steps when using this effective and powerful light which emits 254 nm wavelengths. The results will amaze you and give you peace of mind. 

UVC STEPS TO DISINFECTION:

STEPS:

1. FOLLOW SAFETY GUIDELINES
2. UNDERSTAND BASIC UVC TERMS
3. IDENTIFY UV DOSE
4. SURVEY AREA TO BE DISINFECTED
5. CALCULATE ESTIMATED UV EXPOSURE TIME FOR DISINFECTING
6. DISINFECT AREA AND VALIDATE WITH DOSIMETER CARDS

All surfaces within a certain distance will observe an assured level of disinfection in a certain amount of time as long as the wavelengths are not blocked from accessing the surface.

STEP 1

FOLLOW SAFETY GUIDELINES​

• Excessive exposure to UVC can cause adverse effects on the eyes, retina, skin, circadian system, and immune system.
• Human over exposure causes temporary skin redness and harsh eye irritation.​
• Symptoms may take 4 to 24 hours to occur after exposure.​​

STEP 2

UNDERSTANDING BASIC UVC TERMS​     

RADIANT EXPOSURE = J/m² or mJ/cm²​

• UV INTENSITY (I) = energy per unit surface area​
• EXPOSURE TIME (T) = exposure time in seconds​
• UV DOSE (FLUENCE) =  Intensity (I) x Time (T) expressed as mJ/cm²​

• EXAMPLE:
  a 1 log reduction will reduce the pathogen by 90%, before the UVC disinfection​
  a 2 log reduction will reduce the pathogen by 99%, etc… 

STEP 3​

IDENTIFY UV DOSE

• IDENTIFY TARGETED MICROORGANISMS
• PAIR WITH LOG REDUCTION.   

  PATHOGENS	Common Name	Scientific Name	3 Log Reduction
  Viruses	Rota	Rotaviruses (Human)	32 mJ/cm2
  	Infectious Hepatitis	Hepatitis B	25 mJ/cm2
  	Adenovirus		126 mJ/cm2
  	ECHO Virus	Echovirus	25 mJ/cm2
  Bacteria	Salmonella	Salmonella Typhimurium	22 mJ/cm2
  	Staph	Staphylococcus aureus	3.2 mJ/cm2  (2 log)
  	Strep	Streptococcus faecalis	9.8 mJ/cm2

• UV dose determines what proportion of a specific microorganism is destroyed after a particular dose of UV radiation

  Target 50 mJ/cm2 to deactivate the average bacteria/virus

  Example from Log Reduction

​Example from Log Reduction                 

STEP 4​

SURVEY AREA TO BE DISINFECTED

• MEASURE DIMENSIONS OF AREA TO BE DISINFECTED USING MOBILE UNIT
• TARGET UV DOSE is 50 mJ/cm² 
• PLACE DOSIMETER CARDS ON TARGETED AREAS FOR VALIDATION OF UV DOSE

Our testing Data:

STEP 5​

CALCULATE ESTIMATED EXPOSURE TIME FOR DISINFECTING

• DETERMINE PLACEMENT OF MOBILE UNIT AND NUMBER OF UNITS TO DISINFECT AREA
• CALCULATE EXPOSURE TIME = UV INTENSITY (at a specified distance) / UV DOSE / 60 SECONDS
• UV DOSE = 50 mJ/cm² 
  
  

STEP 6

DISINFECT AREA AND VALIDATE WITH DOSIMETER CARDS

• Color changes from yellow to orange validates 50 mJ/cm² delivered​
• Color changes for orange to pink validates 100 mJ/cm² delivered
  

• Exit the room and run disinfection cycle

• Verify exposure of card and make notations on the card to document the color change

• Make exposure reading within 24 hours after disinfection 

• Retain or discard the card in accord with site requirements

• 1 time use of dosimeter cards

  

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