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Summary

Measurements have been made of the biologically-effective environmental UV-B radiation [UV-B(BE)] received by people in different occupations in Sweden. These UV-B(BE) doses have been compared with those received from artificial UV-B radiation by patients undergoing phototherapy for psoriasis. The results indicate that for patients with outdoor occupations the therapeutic dose contributes something like one third of their total UV-B(BE) presumably only to the hands and face. For patients who work indoors, however, the therapeutic dose can be anything from 50%to almost 100% of their total UV-B(BE) burden.