Explanation

If a certain amount of radioactive material is added to the luminescence materials, it will continuously emit charged or uncharged particles in the process of radioactive material transformation to excite luminescence uniformly for a long time. This kind of luminescence does not need additional energy, and can continuously luminescence. The length of luminescence time depends on the half life of the radioisotope added. This luminescence materials is called permanence luminescent materials. Before the discovery of artificial radioisotope, natural radioactive radium and new thorium salt were the activation sources of permanence luminescent materials. They have serious drawbacks: radioactive radiation has a strong destructive effect on organisms and serious environmental pollution; The strong ionization of X particles causes the destruction of the luminescence materials matrix and the rapid decline of luminescence brightness; Moreover, natural radioisotope are too expensive to be widely used. permanence luminescent materials are mainly used to coat aviation and navigation instruments, instruments, aiming devices, rulers, telescopes, etc. of weapons.

Classification