A survey of the ultraviolet radiation emissions of photochemotherapy units

Abstract

Measurements were made of the spectral emission and irradiance from whole body UV irradiation units used in the treatment of psoriasis [in humans] by photochemotherapy (PUVA). Ten units were studied. Within the limits of experimental accuracy no significant difference was found in the profile of all spectra measured, although the measured value of irradiance compared with each UV-A meter showed wide discrepancies. Poor documentation is provided by manufacturers of UV-A meters on the meaning of the scale reading in mW/cm2; some agreed calibration procedure for these instruments is necessary.