Watch plays an important role in people's lives, and it has been widely used. Many people do not take off their watches because they regarded it as an trouble thing, especially for luminous watch, it would cause harm to human beings. Luminous watch is a kind of watches that to smear the luminous powders, which added the zinc sulfide(ZnS) as a substrate in the watch pointers and dial, so that can be easy to see the time in the dark, this kind watches have high availability and attractiveness. Although ZnS can produce light for some times after the sun or light exposure, but the time is still limited. Therefore, in order to maintain its night vision function, the manufacturers usually doped with a certain amount of radioactive elements, i.e.the element radium into the ZnS, the radium can release the radiation, which can stimulate zinc sulfide to light. Therefore, if do not take off the luminous wristwatch when you go to sleep at night, it would be suffered from the laser radiation and thus endanger our health. So how can effectively reduce the radium radiation of luminous watches in order to achieve both availability and attractiveness?

 

It has been recognized by many industries that tungsten alloy has great radiation shielding capability. A series excellent properties of good ability to absorb radiation, good corrosion resistance and oxidation resistance, and good weldability of tungsten alloy pave the way to being used for preparing shielding materials. The purpose of luminous watches radiation shielding can achieved by inserting a small chip that made of tungsten alloys (the chip is a radiation shielding device) inside the watch, and this tungsten alloy shielding chip device can absorb the extra-rays of the luminous watches.