Individual solar-UV doses of pupils and undergraduates in China

The solar-UV exposures of school pupils and medical undergraduates were studied over four seasons in Shenyang (latitude 41 degrees 11'-43 degrees 2', longitude 122 degrees 25'-123 degrees 48'), Liaoning, PR China. Ultraviolet exposure was measured using personal ultraviolet radiation (UVR) sensor on sunny days along with simultaneous monitoring and recording of direct-ambient UVR dose (perpendicular UV dose) for comparison. We observed that the UV doses of pupils on weekdays were higher than those on weekends and that the UV doses of the pupils were significantly higher than those of the undergraduates during both weekdays and weekends. The percent of the mean individual daily UV dose to the environmental counterpart are 2.88% (Autumn), 7.76% (Winter), 3.77% (Spring) and 2.06% (Summer) for the pupils, and corresponding percent for the undergraduates are 0.88%, 0.32%, 0.67% and 0.81%. The means of minimum erythemal dose values with pupils for weekday (5 days), weekend (2 days) and week (7 days) through the whole year are 0.302 (0.275 ~ 0.328), 0.215 (0.170 ~ 0.261) and 0.278 (0.255 ~ 0.301), respectively. The corresponding means with undergraduates are 0.097 (0.081~ 0.113), 0.091 (0.070 ~ 0.112) and 0.095 (0.082 ~ 0.108), respectively. Although the season is a major factor influencing the personal direct-ambient percent, it is emphasized that the impact of the lifestyle cannot be ignored.