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Table 2 Irradiation times calculated with and without direct irradiance measurements

From: Ultraviolet C lamps for disinfection of surfaces potentially contaminated with SARS-CoV-2 in critical hospital settings: examples of their use and some practical advice

Position Distance from the lampa Angleb Expected irradiance from nominal data Irradiation time corresponding to expected irradiance Measured irradiancec Irradiation time corresponding to measured irradiance Time required to compensate for the emission not immediately fully operational Total irradiation time corresponding to measured irradiance Difference between measured and expected time
  [m] [°] [μWatt/cm2] [s] [μWatt/cm2] [s] [s] [s]  
CT bed - Mobile support equipped with an AirZing™ PRO5040 lamp
 Side edge of the bed 0.90 20 165 224 160 231 19 250 10.4%
 Headrest 1.40 45 71 521 46 804 17 821 36.6%
Cubicle for nasopharyngeal swab - Mobile support equipped with two AirZing™ PRO5040 lamps
 Medical chair 0.85 20 199 187 191 194 17 211 11.4%
 Side edge of the bed 1.30 30 83 446 74 500 18 518 13.9%
Waiting room for COVID-19 triage - Two Deluxe110 lamps on the ceilingd
 First chair 1.90 0 166 223 196 189 10 199 −12.1%
 Second chair 2.60 45 89 416 89 416 9 425 2.1%
Waiting room for COVID-19 triage - Two AirZing™ PRO5040 lamps on the ceilingd
 First chair 1.90 0 39 949 42 881 18 899 −5.6%
 Second chair 2.60 45 21 1762 13 2846 17 2863 38.5%
Waiting room for COVID-19 triage - Two Sterilight-S72-UV-C lamps on the ceilingd
 First chair 1.90 0 61 607 109 339 13 352 −72.4%
 Second chair 2.60 45 33 1121 30 1233 13 1246 10.0%
Waiting room for COVID-19 triage - Two Deluxe110 lamps on the wallsd
 First chair 2.30 0 113 327 139 266 10 276 −18.5%
 Second chair 4.60 45 28 1321 28 1321 9 1330 0.7%
  1. aThe distance is calculated from the reference position to the center of the luminous elements
  2. bAngle between the axis orthogonal to the luminous elements and the line joining the reference position and the center of the luminous elements
  3. cIrradiance measurements were made two minutes after switching on
  4. dIrradiance measurements were made by switching on only one lamp at a time