When cosmic ray particles pass through the scintillator, the organic doping within is excited and hence emit ultra-violet and bluish light.

• 密封可避免环境光线影响光电倍增管。每当宇宙射线粒子穿透塑胶闪烁器时，闪烁器内的有机掺杂物便会受激发而放出蓝光及紫外光。