Some routine and novel approaches to chemical dosimetry of far-ultraviolet light emitted by bactericidal tubes.

Detailed protocols are presented of two improved chemical procedures, based upon a photochemical decomposition of uranyl oxalate or potassium ferrioxalate, enabling a reliable measurement of the far-ultraviolet light emitted by a low-pressure mercury-vapour lamp. Besides, an original semi-quantitative method of UV dosimetry is presented and discussed, employing optical detection of a chromophore formed in the photo-oxidized glutathione. In addition to exemplary computations of UV light dose rate, a simple formula is proposed for recalculating its value while varying the distance from the lamp.