The sun is a source of health and beauty, but according to the frequency and duration of the exposure we make to solar radiation, the effects may be favorable or not so much.Remember that the effect of Sun is not immediate and can cause some problems that we will detail below.
Red, reddish skin
The skin redness after exposure to the sun , it can take up to 24 hours to appear, since that is the period of time that the blood vessels need to dilate and allow more blood to reach to the cells affected by the rays.Also, it is also what it takes for the skin to make the “ melanin ”, that is the pigment that darkens our skin.
The radiations of the Sun and the ozone layer
The radiations of the Sun that are received on the Earth's surface change as it passes through the Atmosphere.There are some radiations that are carriers of high energy content, such as gamma rays, UVC, UVB, etc.The effects of these radiations on humans depend on energy, that is, on the ability to penetrate the skin.

The ozone layer is responsible for stopping to some extent the radiations incompatible with our health, ultraviolet rays, thus preventing them from reaching the Earth's surface and causing alterations that In some cases they can be lethal.We are all aware of the deterioration that the ozone layer permanently suffers, although it is still very difficult to quantify it.
The penetration of radiation in our body
Solar radiation penetrates our skin according to the optical characteristics of the skin and the wavelength of radiation.There are four fundamental processes and they are reflection, diffraction, direct transmission and absorption.The tan is a form of skin response to the radiations of the Sun , its capacity changes from one person to another and can develop different stages such as direct or indirect tanning.

Due to its strength and heat, solar rays also have the property of burning our hair , and together with the saline effect, the hair can become clear in a simple symptom that it is being negatively affected. ultraviolet rays alter the hair matter and at the same time discolor the hair; later it will appear brittle and dry.Then: take care of the sun's rays!
Images: jimaral , Martin Canoval
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