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Home > Ultraviolet Lights and Products > UV Sterilizer Portable Germicidal Lamp > Germ Killing Table

   

 

 

 

 

 
 

Operation of a Typical DeGERM-inatorTM in Time and Energy to Inactivate or Destroy 90% Plus of the Organisms Listed Below

 








ORGANISM

Approximate time (in seconds) required at specified irradiance in microwatts per square centimeter (µW/cm2)



Energy required

1500 µW/cm2
in seconds
 
(new batteries)

1000 µW/cm2
in seconds
 
(after 3 hours of use)


µW.sec
cm2

BACTERIA

S. enteritidis

3

4

4000

B. megatherium
sp. (veg) *

1

1

1300

B. megatherium sp. (spores) *

2

3

2730

B. paratyphosus

2

3

3200

B. subtilis *

5

7

7100

Corynebacterium diphtheriae *

2

3

3370

Eberthella typhosa

1

2

2140

Escherichia coli
(E. coli) *

2

3

3000

Micrococcus
candidus

4

6

6050

Neisseria
catarrhalis

3

4

4400

Phytomonas tumefaciens

3

4

4400

Proteus vulgaris *

2

3

2640

Pseudomonas
aeruginosa *

4

6

5500

Pseudomonas fluorescens

2

4

3500

S. typhimurium

5

8

8000

Seratia marcescens *

2

2

2450

Dysentery bacilli

1

2

2200

Shigella paradysenteriae

1

2

1680

Spirillum rubrum

3

4

4400

Staphylococcus
albus

1

2

1840

Staphylococcus
aureus *

2

3

2600

Streptococcus hemolyticus

1

2

2160

Streptococcus
lactis

4

6

6150

Streptococcus
viridans

1

2

2000

Salmonella
paratyphi-enteric fever

2

3

3200

Nitric comma
(cholera)

2

3

3375

Leptospira canicola (infectious jaundice)

2

3

3150

VIRUSES

Infectious
hepatitis

4

6

5800

Poliovirus
poliomyelitis

2

3

3150

Influenza

2

3

3400

 
       
  For optimal use, operate at 77°F (25°C) at a maximum distance of 0.5 inch (1.3cm) with fresh batteries (less than 3 hours of use).

* Tests conducted and verified under Anastasia Gregoriades, Ph.D., at Queens
   College (New York) established the kill ratio by the DeGERM-inatorTM on the
   organisms cited.

  • The lethal exposure time of the organism is determined by the wavelength of radiation, density of radiant flux (µW/cm2) and time.
  • The time required to kill or inactivate greater than 90% is proportionate to the ratio of the required killing energy and the irradiance of the light source, i.e., Time = Energy Required (µW.sec/cm2)/ Irradiance (µW/cm2).
  • The ultraviolet output can vary considerably with temperature, distance and battery charge.
  • Safe exposure limits for ultraviolet germicidal radiation have been set by the American Conference of Governmental and Industrial Hygienists, as noted below.
 
       
 

Exposure
Per Day

Irradiance
at a Constant Level in µW/cm2

8 hours

0.2

4 hours

0.4

1 hour

1.6

10 minutes

10

1 minute
(60 seconds)

100

6 seconds

1000



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