title: Conversion factors for ultraviolet radiation dosage with different types of ultraviolet therapy.
abstract: Erythema thresholds were determined using 4 different UV units before and after photosensitization with psoralens or coal tar in healthy volunteers. Conversion factors for equivalent erythema-producing UV doses with the different types of treatment were calculated on the basis of the erythema thresholds. A simple mode of transfer of patients between the different treatments with good precision of UV dosage is thus offered.
mesh_terms: D003033:Coal Tar; D004307:Dose-Response Relationship, Radiation; D004890:Erythema / Q000209:etiology; D011564:Furocoumarins; D006801:Humans; D008297:Male; D010787:Photosensitivity Disorders; D011829:Radiation Dosage; D014466:Ultraviolet Rays / Q000009:adverse effects; D014467:Ultraviolet Therapy
chemical_list: D011564:Furocoumarins; D003033:Coal Tar