Natural and artificial photoprotection.

  title={Natural and artificial photoprotection.},
  author={Derek J Cripps},
  journal={The Journal of investigative dermatology},
  volume={77 1},
  • Derek J Cripps
  • Published 1981 in The Journal of investigative dermatology
A solar simulator is described with collimated filtered radiation incorporating an optical integrator to more evenly diffuse the xenon 2.5 KW light source. Populations can be catogorized into skin types I-VI and the minimal erythema dose (MED) in each skin type measured in Joules/cm2 was compared to give a relative suntan photoprotection factor or SPF compared with type I (1.0) so that type II had an SPF of 1.67, type III SPF of 2.5, type IV V had an SPF of nearly 4, whereas the darker Negroid… CONTINUE READING

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