On the other end, the atmosphere blocks most UVC rays and reduces the amount of UVB rays which reach the surface, while allowing UVA rays to filter through.Large format UV and X-ray focal plane detector arrays: micro-channel plates, CCDs, and active pixel sensors (>50% QE, 100 Megapixels, <0.1 W/Megapixel, 30 Hz). Our atmosphere blocks out harmful high-energy radiation like x-rays, gamma rays and most of the ultraviolet rays.The atmosphere also absorbs most of the infrared radiation which reaches the Earth from space. ultraviolet A (UVA) ultraviolet radiation with wavelengths between 320 and 400 nm, comprising over 99 per cent of such radiation that reaches the surface of the earth.UV In Our Atmosphere. denoting electromagnetic radiation of wavelength shorter than that of the violet end of the spectrum, having wavelengths of 4-400 nanometers.
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