3D Modelling for Solar Erythemal UV Protection Provided by Human Hair

The head is one of the most sun-exposed anatomical zones and its ultraviolet (UV) exposure is often underestimated. The goal of this research is to quantify the solar erythemal UV protection provided by human hair for different orientations and Solar Zenith Angles (SZA). For this purpose, a three-di...

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Main Authors: Arianna Religi, Laurent Moccozet
Format: Article
Language:English
Published: MDPI AG 2019-11-01
Series:Applied Sciences
Subjects:
Online Access:https://www.mdpi.com/2076-3417/9/22/4724
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spelling doaj-91cc7bae5ee94ac286bebd7738ab58362020-11-25T01:48:11ZengMDPI AGApplied Sciences2076-34172019-11-01922472410.3390/app9224724app92247243D Modelling for Solar Erythemal UV Protection Provided by Human HairArianna Religi0Laurent Moccozet1Centre Universitaire d’Informatique (CUI), University of Geneva, Route de Drize 7, 1227 Carouge, SwitzerlandCentre Universitaire d’Informatique (CUI), University of Geneva, Route de Drize 7, 1227 Carouge, SwitzerlandThe head is one of the most sun-exposed anatomical zones and its ultraviolet (UV) exposure is often underestimated. The goal of this research is to quantify the solar erythemal UV protection provided by human hair for different orientations and Solar Zenith Angles (SZA). For this purpose, a three-dimensional (3D) numeric simulation tool called SimUVEx was used to forecast the distribution of UV exposure based on geometric information and solar irradiance. The relative UV dose reduction was expressed in terms of predictive protection factor (PPF). Results showed that the effectiveness of the protection depends strongly on the orientation of the head and on the tilt of the hairs. As the SZA increases, the PPF also increases. PPFs provided by hair with a certain degree of order (parallel alignment) were generally higher by a range of about 10%−30% than the ones provided by random arrangements. A significant exposure to the scalp through the hair, even for an average hair density, was found. It confirms that hair is an important natural sunscreen in reducing transmission of UV radiation and must be considered in the prevention messages of skin cancer on the scalp, particularly in people with alopecia.https://www.mdpi.com/2076-3417/9/22/47243d human modellinguv radiationskin cancersun protectionhuman hair
collection DOAJ
language English
format Article
sources DOAJ
author Arianna Religi
Laurent Moccozet
spellingShingle Arianna Religi
Laurent Moccozet
3D Modelling for Solar Erythemal UV Protection Provided by Human Hair
Applied Sciences
3d human modelling
uv radiation
skin cancer
sun protection
human hair
author_facet Arianna Religi
Laurent Moccozet
author_sort Arianna Religi
title 3D Modelling for Solar Erythemal UV Protection Provided by Human Hair
title_short 3D Modelling for Solar Erythemal UV Protection Provided by Human Hair
title_full 3D Modelling for Solar Erythemal UV Protection Provided by Human Hair
title_fullStr 3D Modelling for Solar Erythemal UV Protection Provided by Human Hair
title_full_unstemmed 3D Modelling for Solar Erythemal UV Protection Provided by Human Hair
title_sort 3d modelling for solar erythemal uv protection provided by human hair
publisher MDPI AG
series Applied Sciences
issn 2076-3417
publishDate 2019-11-01
description The head is one of the most sun-exposed anatomical zones and its ultraviolet (UV) exposure is often underestimated. The goal of this research is to quantify the solar erythemal UV protection provided by human hair for different orientations and Solar Zenith Angles (SZA). For this purpose, a three-dimensional (3D) numeric simulation tool called SimUVEx was used to forecast the distribution of UV exposure based on geometric information and solar irradiance. The relative UV dose reduction was expressed in terms of predictive protection factor (PPF). Results showed that the effectiveness of the protection depends strongly on the orientation of the head and on the tilt of the hairs. As the SZA increases, the PPF also increases. PPFs provided by hair with a certain degree of order (parallel alignment) were generally higher by a range of about 10%−30% than the ones provided by random arrangements. A significant exposure to the scalp through the hair, even for an average hair density, was found. It confirms that hair is an important natural sunscreen in reducing transmission of UV radiation and must be considered in the prevention messages of skin cancer on the scalp, particularly in people with alopecia.
topic 3d human modelling
uv radiation
skin cancer
sun protection
human hair
url https://www.mdpi.com/2076-3417/9/22/4724
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