Editor—We have studied the ultraviolet light output of ultraviolet A sunbeds available for hire in Bradford and found a striking variability in the output of both ultraviolet A and ultraviolet B.1 Results from the analysis of the 50 sunbeds studied showed a threefold variation in ultraviolet A output with a mean output of 13.5 mW/cm2 and a 60-fold variation with a mean of 19.2 µW/cm2 for ultraviolet B. …
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HART et al. (1997) studied this question.
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