![]() In addition, more recently other functions have been described, for example its regulatory role in immunity in humans, its effect on inflammation (attenuating inflammation), and its benefits for cardiovascular health and cancer. ![]() This process is necessary for the regulation of calcium homeostasis and bone metabolism, providing a proper bone health. A moderate daily degree of this radiation is essential for the synthesis of Vitamin D through skin, liver and kidney pathway. According to WHO guidelines, UV exposure should be controlled. Thus, in this article we propose to establish a direct relationship between this index and the different degrees of sunburn as a function of the exposure time and skin type, providing the population with a greater perception of the danger posed by solar radiation. Sometimes, this index is difficult to interpret by the general population, since they do not perceive the danger that it could cause to their skin. To establish a simple methodology to inform the population of the intensity of solar radiation, the ultraviolet index (UVI) was established, a simple number that informs of the dangerousness of the sunlight as a function of the Earth’s relative position to the Sun, altitude, cloudiness, etc 2. One of the main effects of solar radiation is first and, less frequently, second-degree sunburn 1. Due to these differences, the World Health Organization (WHO) divided the type of skin according to its melanin levels and, therefore, its resistance to sunburn 1. Sunburn on a person with very fair skin can occur in less than 15 minutes of exposure to the Sun at noon, while a person with darker skin can tolerate the same exposure for hours 1. Melanin is the coloration (pigment) that protects the skin. Sunburn is the reddening of the skin that occurs after having been overexposed to the Sun radiation or other types of ultraviolet light, because melanin is not able to protect the skin when there is a high degree of exposure to the Sun (or a source of ultraviolet light). Therefore, managing risk perception with this useful table could familiarize the population with actual harm prevention. Moreover, ultraviolet exposure to sunlight could not just result in sunburn, but also have long-term effects on eyes, or even cause immune system disorders or melanoma. In addition, this article aims to raise awareness of the potential harm caused by solar radiation by indicating the percentage of population affected by different types of sunburn depending on skin-type. Finally, this paper presents a table where the population can easily interpret the UVI values and calculate the maximum time one can be exposed to solar radiation without getting sunburn. The results have been adjusted and validated through experimental results taken from the bibliography. Moreover, we present a new expression that relates the intensity of solar radiation and the UVI, as well as expressions to obtain the percentage of population affected both by first and second degree lllsunburn for every skin-type. In this paper, a relation between the ultraviolet index (UVI) as a Sun exposure time and its effects in the form of burns according to the skin type has been elaborated.
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