Table 1.
Average percentage pathogen reduction, irradiance and calculated 8-h exposure dose for three different exposure conditions at two heights from the ground.
| Peak values | Average values | Average % pathogen reduction (SD) | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Height = 1.7 m | Height = 1 m | Height = 1.7 m | Height = 1 m | |||||||
| Irradiance (µWcm-2) | 8-h dose (mJcm-2) | Irradiance (µWcm-2) | 8-h dose (mJcm-2) | Irradiance (µWcm-2) | 8-h dose (mJcm-2) | Irradiance (µWcm-2) | 8-h dose (mJcm-2) | |||
| High | 1 lamp | 14.4 | 415 | 1.93 | 56 | 0.57 | 16.5 | 0.45 | 12.9 | 93.7**** (1.0) |
| 5 lamps | 14.4 | 415 | 3.42 | 98 | 2.73 | 78 | 2.01 | 58 | 98.4**** (0.7) | |
| Medium | 1 lamp | 0.92 | 26.5 | 0.13 | 3.7 | 0.03 | 0.87 | 0.03 | 0.82 | 65.9**** (4.0) |
| 5 lamps | 0.92 | 26.5 | 0.22 | 6.3 | 0.14 | 4.1 | 0.13 | 3.67 | 92.0**** (0.9) | |
| Low | 1 lamp | 0.09 | 2.65 | 0.01 | 0.37 | 0.003 | 0.09 | 0.003 | 0.08 | 12.8 ns (3.8) |
| 5 lamps | 0.09 | 2.65 | 0.02 | 0.63 | 0.01 | 0.41 | 0.01 | 0.37 | 28.7** (3.4) | |
The bold, italicised 8-h exposure values are above the ICNIRP 222-nm exposure limit of 23 mJcm-2. No exposures exceeded the 2022 ACGIH threshold limit value for skin of 478 mJcm-2 at 222 nm. Statistical significance is represented by: ns = p > 0.05, * = p ≤ 0.05, ** = p ≤ 0.01, *** = p ≤ 0.001, and **** = p ≤ 0.0001.