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把夜光表的表面靠近灯,讓它照一会兒,拿开在黑暗中观察,我們看到表的指針亮了許多,不过它逐漸在那里減弱,一直到恢复原狀。仔細地看,还可以發現指針的發光不是穩定的,而是一閃一閃的。特别是我們在黑暗中躭了較長的时間,我們的眼睛灵敏起來之后,这种閃爍会顯得格外分明。夜光表的表面上某些地方和指針上塗有一層黄綠色的东西,它是由一种發光材料和一点点放射性物質組成的,这叫做永久發光材料。 發光材料是这样一种物質,它被可見光、紫外綫、X射綫、γ射綫以及电子、α粒子和其它高能
Bring the surface of the luminous watch close to the lamp, let it take a moment, take it away and observe it in the darkness. We see that the pointer of the watch is much brighter, but it gradually diminishes there until it is restored. Look closely, you can also find the pointer’s light is not stable, but a flash. In particular, we spent a long time in the dark, and after our eyes became sensitive, this kind of twinkling would be particularly clear. Some places and hands on the surface of the luminous watch are coated with a yellow-green layer. It consists of a luminous material and a little radioactive material. This is called the permanent luminous material. The luminescent material is a substance that is visible light, ultraviolet rays, X-rays, gamma rays, and electrons, alpha particles, and other high energy.