![]() ![]() ![]() There is a risk of damage, especially to the eyes and possibly also to the skin, if the intensity of light exceeds certain effect thresholds.This is not an easy question. For example, light with a relatively high proportion of blue light is used in light therapy devices or daylight lamps to treat "winter depression" or to set the "body clock" when everyday life involves little natural light. Many lasers and IPL devices ("flash lamps") operate with different wavelengths of light. Light has long been used for medical and cosmetic purposes. Light is not only responsible for allowing us to see our surroundings but also has other biological effects and influences the sleep/wake cycle, among other things. The transitions between the colours are fluid. *This table is for indicative purposes only. The principal natural radiation source for light is the sun, but our everyday lives also feature a multitude of artificial light sources. Especially for the short-wavelength section of the visible spectrum (blue light), the transparency of the lens decreases with age. Moreover, a person's eyesight and sensitivity to light vary over their lifetime due to ageing processes in the eye. Rather than being clear cut, the boundaries of the visible region of the spectrum for humans exhibit fluid transitions. Most people can perceive wavelengths of between about 400 nanometres ( nm) and 780 nm visually. The wavelengths of light penetrate as far as the retina in the eye and the dermis in the skin. It lies between UV and infrared radiation. Light or "visible light" refers to the visible region of the electromagnetic spectrum – that is, the range of wavelengths that trigger brightness and colour perception in humans. Light can also be harmful if certain effect thresholds are exceeded.The principal natural radiation source for light is the sun.Most people can perceive wavelengths of between about 400 nanometres ( nm) and 780 nm visually.Light refers to the visible region of the electromagnetic spectrum.Biological dosimetry following radiation exposure.Comparative tests for passive radon measuring devices.Accredited calibration laboratory.Measurement exercises on the ground.Helicopter-borne Measurement Exercises.Exercises for emergency situations.Response to Nuclear Security Events.Federal Radiological Situation Centre.What are the consequences of an emergency?.Occupational radiation protection.Atomic bombings: radiation protection.Principles of radiation protection.Ionising radiation: positive effects?.Epidemiology of radiation-induced diseases.Consequences of a radiation accident.Effects of selected radioactive materials. ![]()
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