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A-4.2 Assessment of exposure to ultraviolet radiation within a lifetime

[Contact Person]

Masaji Ono
Section Chief
Environmental Health Sciences Division,
National Institute for Environmental Studies, Environment Agency
Onogawa 16-2, Tsukuba, Ibaraki, 305-0053 Japan
Tel :+81-298-50-2421 Fax:+81-298-50-2588
E-mail:ono@nies.go.jp

Total Budget for FY1996-FY1998

18,921,000 Yen (FY1998; 6,272,000 Yen)

Abstract

The purpose of our study is to estimate the level of ocular exposure to UVR within a lifetime and to clarify the relationship between UVR exposure level and occurrence of cataract, based on population-based field surveys. We conducted following studies:
(1) We developed a new mannequin head model for UVR dosimetry. It is controlled by personal computer and is able to simulate the movement of human head which is obtained and installed into computer previously. We utilize this system for UVR exposure experiments.
As the results we clarified that glasses use may reduce the exposure level of UVR against the eye to 17% of that without glasses. And we estimated the reduction rate of hat use about 40%.
(2) We discussed the effectiveness of short questionnaire to estimate UVR exposure within the time spent outdoors and we found that the length of the time spent outdoors within 9:00 to 15:00 will give the best estimate of the whole day UVR exposure.
(3) We tried to estimate the ocular UV exposure of participants who attended the epidemiological study using short questionnaire. And we found weak correlation between the prevalence rate of cataract formation and the estimated ocular UV exposure.

[Key Words]

mannequin model, exposure assessment, ultraviolet radiation (UVR), outdoor activity, life style