Scientists find visible light intensity changes over time

Japanese scientists have recently discovered that the human body emits a faint visible light that changes in intensity over the day.　　According to the United States July 22 reported that previous studies have found that the human body will release visible light, its intensity is the naked eye can feel the intensity of 1/1000. In fact, almost all creatures emit very faint light, which is thought to be the result of a chemical reaction involving free radicals (atoms or groups of electrons).　　This kind of visible light is different from infrared, infrared is not visible light, it comes from body heat. To learn more about this weak visible light, Japanese scientists have used cameras that are highly sensitive and can detect single photons. 5 healthy men, aged more than 20, were placed in all dark rooms for 3 consecutive days, from 10 o'clock in the morning to 10 o'clock every day, and stood topless for 20 minutes every 3 hours. The study found that the human body emits light at different times of the day, the intensity of the weakest light is 10 o'clock in the morning, the strongest time is 4 o'clock in the afternoon, and then gradually weaken.　　The results suggest that luminescence is associated with the body's biological clock, which may change over the day due to metabolic rhythms. The face is stronger than the light emitted from other parts of the body.　　This could be because facial skin is darker than other parts of the body, and melanin in the skin contains luminescent material. Gang, a biologist at Kyoto University in Japan, says that since this faint light is associated with metabolism, it may help to detect human disease. "If you can see the light on the surface of the body, you can see the whole body," said Shing, a biomedical photonics expert at the Northeastern University of Sendai, Japan. "There are _count_ comments I want to comment