The Physiological Effects of Radiant Energy

摘要: Skin.-The specific effects of long wave ultraviolet radiation are different from those short wave. Following irradiation with energy extending 320 to 480 mJ.' a marked, deep red erythema is produced. The maximum effect observed at 385 m,u., two weaker maxima 360 and 408 mJ.'. If the intensities so chosen that same degree produced 297 mJ.', reaches its in three hours, while just becoming noticeable. Twelve hours after ir­ both show maximal reddening, but color obtained carmine red, brown red; forty-eight after, brown, still maximally red. Five weeks later, strongly barely pigmented. A slight produces marked tanning, hardly any. threshold 500 times greater than m,u.. 360, 385, m,u. probably related absorption by molecules cells deeper horny layer. There similarity hemin. Irradiation has special significance treatment tubercular conditions, rickets (48). several contributions thjs relation between spe­ cific shorter longer pro­ duction tan, including contrasts ac­ tion sunlight wealth rays poverty shorter, emitted various artificial sources (52, 71, 80, 87, 113) , pigmentary changes skin have been objectively de­ termined, spectrophotometrically, (19, 20). curve first (hyperemia) indicates active arte­ rial blood flow; later shows shift oxyhemoglobin reduced hemoglobin indicating stagnation decreasing