Methods: in view of the radioactive rays wave length, the penetrating power, the fluorescence function, the photographic function and the biological effect to analyze radio formation a mechanism.
方法：针对放射线的波长、穿透力、荧光作用、摄影作用和生物效应分析放射性形成机制。
2
The next thing he found out was that if he put his hand between the rays and a photographic plate, the rays could print a shadow of a bony framework of his hand on the plate.