Table 3.
Test conditions and decontamination efficacy results for Bacillus atrophaeus spores, suspension versus aerosol deposition, using the low-pressure mercury lamp
| Material | Exposure time (min) | Average UVC dose mJ cm−2 | Average efficacy (LR) suspension inoculation | Average efficacy (LR) aerosol inoculation | Average T (°C) | Average RH (%) | Average UVC intensity (mW cm−2) |
|---|---|---|---|---|---|---|---|
| Glass | 15 | 432 | 3·23 ± 0·07 | 3·60 ± 0·30 | 22 ± 0·9 | 70 ± 1·7 | 0·48 ± 0·02 |
| 30 | 864 | 3·71 ± 0·15 | 3·21 ± 1·32 | ||||
| 60 | 1728 | 3·48 ± 0·69 | 4·70 ± 0·40 | ||||
| 120 | 3456 | 3·28 ± 0·90 | 5·00 ± 0·39 | ||||
| Wood | 5 | 141 | 0·58 ± 0·07 | 1·14 ± 0·16 | 22 ± 0·4 | 83 ± 1·6 | 0·47 ± 0·02 |
| 30 | 846 | 1·63 ± 0·15 | 1·63 ± 1·63 | ||||
| 60 | 1692 | 1·76 ± 0·18 | 1·84 ± 1·84 | ||||
| 120 | 3384 | 2·92 ± 0·00 | 3·10 ± 0·00 | ||||
| Glass | 180 | 4590 | 4·94 ± 0·37 | 3·09 ± 0·38 | 23 ± 1·0 | 71 ± 3·0 | 0·42 ± 0·04 |
| Wood | 2·45 ± 0·28 | 2·00 ± 0·67 | |||||
| Carpet | 1·03 ± 0·18 | 2·78 ± 0·49 | |||||
| Laminate | 4·93 ± 0·23 | 3·06 ± 0·90 | |||||
| Glass | 360 | 8726 | 5·12 ± 0·57 | 4·74 ± 0·51 | 23 ± 0·8 | 70 ± 2·9 | 0·40 ± 0·04 |
| Wood | 2·38 ± 0·08 | 3·00 ± 0·61 | |||||
| Carpet | 1·32 ± 0·13 | 3·47 ± 0·45 | |||||
| Laminate | 5·27 ± 0·29 | 4·39 ± 0·26 |