It is best not to sleep with a watch, which will not only shorten the service life of the watch, but also be harmful to the health. Because watches, especially luminous watches, have radium radiation, although the amount is extremely small, but long-term accumulation will lead to adverse consequences.
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Luminous watches, referred to as luminous watches, are coated with luminous powder on the dial block and hands, so that the time can be seen clearly at night or in the dark.
In the past, luminous powder was based on powdered zinc sulfide, which did not emit light itself, but only had phosphorescence characteristics, that is, it was excited after being irradiated by sunlight or light, and it would continue to emit light for a certain time, but the time was very short. In order to continuously excite zinc sulfide, a certain amount of radioactive elements must be mixed.
Radium, a radioactive element commonly used in the past, is now mostly holmium. According to the dose of radioactive elements, the luminous brightness is different. Radioactive elements can not only stimulate the luminescence of luminescent materials, but also gradually destroy the structure of luminescent materials, making the performance of luminescent materials weaken or even disappear, so the luminous meter will not light up after a certain period of use.
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Baidu encyclopedia-luminous watch