Definition: The word "actinic" refers to a type of solar radiation that occurs when light from the Sun hits Earth's surface at an angle that results in high concentrations of this specific type of radiation reaching our planet. Actinic radiation can occur in various ways, including direct sunlight and small amounts of solar radiation hitting the Earth's surface. The intensity of actinic radiation depends on a number of factors, such as the distance from the Sun, the atmospheric conditions, and the angle at which the Sun is hitting the Earth's surface. In general, actinic radiation can be harmful to life on Earth due to its high concentration levels in the atmosphere. It is estimated that about 10% of the total solar energy emitted by the Sun reaches our planet's atmosphere, with over 90% being absorbed and lost as a result of this process. This means that when sunlight hits the surface of the Earth, it can be damaged or destroyed. Overall, actinic radiation can have significant impacts on life on Earth, and understanding its properties is crucial for mitigating its effects and protecting human health and well-being.
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