Article: Ultraviolet radiation: human exposure and health risks.(Cover Story)

Introduction

Ultraviolet radiation (UVR) is one portion of the electromagnetic radiation (EMR) spectrum. EMR consists of oscillating electric and magnetic fields that can be propagated both in free space and in matter (1). The main groupings of the EMR spectrum (in order of increasing wavelength) are as follows:

* cosmic and gamma rays,

* X-rays,

* ultraviolet radiation,

* visible radiation,

* infrared radiation,

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