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STUDY ON RADIATION TRANSFER IN HUMAN SKIN FOR COSMETICS

DOI: 10.1615/ICHMT.2004.RAD-4.260
10 pages

Jun Yamada
Dep. of Mech. Eng. SIT, Tokyo, Japan; Shibaura Institute of Technology, 3-7-5 Toyosu, Koto-ku, Tokyo 135-8548, Japan

Ayumu Kawamura
Graduate School of Medical and Engineering Science Department of Research, University of Yamanashi, 4-3-11 Takeda, Kofu, Yamanashi 400-8511, Japan

Yoshimasa Miura
Research & Development Division, Shiseido Research Center Shiseido Co., Ltd, 2-2-1 Hayabuchi, Tsuzuki, Yokohama, Kanagawa 224-8558, Japan

Sadaki Takata
Research & Development Division, Shiseido Research Center Shiseido Co., Ltd, 2-2-1 Hayabuchi, Tsuzuki, Yokohama, Kanagawa 224-8558, Japan

Katsuki Ogawa
Research & Development Division, Shiseido Research Center Shiseido Co., Ltd, 2-2-1 Hayabuchi, Tsuzuki, Yokohama, Kanagawa 224-8558, Japan

Abstract

In order to design cosmetics producing the optical properties that are required for a beautiful skin, the radiation transfer in the skin has been numerically investigated by a Monte Carlo method and the effects of skin texture and cosmetics on the radiation transfer have been empirically investigated using an artificial skin. The numerical analysis showed that the total internal reflection suppresses large portion of radiation going out through the skin surface Additionally, the experimental study revealed that skin texture and cosmetics not only diffusely reflect the incoming radiation, but also lead the internally reflected radiation to the outside of the skin.

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