Concentration (PPM) UV-A (2.0 mW/cm2) UV-B (0.5 mW/cm2) Sunlight
5 0.087 0.191 0.153
10 0.092 0.180 0.246
20 0.182 0.121 0.194
30 0.625 0.180 0.199
40 0.885 0.392 0.224
50 0.912 0.310 0.115
Control (50ppm) 0.978 0.826 0.977
Table 1b: Generation of singlet oxygen in Benzenthrone on exposing in UV-A, UV-B, and Sunlight for 1hr.