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(a) N95 respirator with UV strips placed at the surface closest to the lamp and at the edge (yellow arrows). Left: before and right: after UVC treatment. Note the strip changed color after UV exposure. (b) Strips placed at surface being directly and indirectly irradiated. Upper panel: before irradiation, lower panel: after irradiation. (c) Hoenle UV scan dose measurements as a function of dose measured with UV sensor integrated within the Daavlin unit
