Skin cancer has become a growing human health problem. In the past 30 years, the number of people suffering from skin cancer has exceeded the total number of people suffering from other types of cancer. In the United States, skin cancer has become a very common form of cancer, with more than 3.5 million cases diagnosed each year. Therefore, people are becoming more and more concerned about measuring the amount of ultraviolet (UV) radiation they receive. More precisely, most people believe that UV is the cause of skin cancer tumors.
UV radiation is a natural part of the environment and can benefit humans even in small amounts. if we try to eliminate all UV radiation, we will find that bone diseases caused by vitamin D deficiency gradually increase. This is because vitamin D needs to be removed from the body with the help of UV. synthesis. How much health benefits you get from UV varies from person to person, because there is an inevitable connection between UV exposure and skin pigmentation. The key is to maintain UV radiation at an excellent health level, and not so high that it is dangerous.
When developing UV sensing applications, it is useful to distinguish between different UV types. At the Second International Conference on Optics in 1932, three types of UV with wavelengths in the range of 100nm-400nm were clearly defined: UVA, UVB, and UVC. For consumer applications for ambient light UV measurement, only two of these types (UVA and UVB) are important. Short-wavelength UVC photons from sunlight cannot penetrate the atmosphere and, in most cases, can be ignored by personal health and wearable products. UVC is mainly used in industrial applications, such as disinfection and disinfection equipment, because UVC radiation has a killing effect on bacteria and other infectious microorganisms
UVA and UVB rays can penetrate the earth’s atmosphere, but shorter-wavelength UVB rays (290nm-320nm) are more easily absorbed than long-wavelength UVA rays (320nm-400nm). In addition to more easily penetrating the atmosphere, UVA rays penetrate human skin more easily than UVB rays with higher energy.
