? Mathematically, it refers to the trajectory of a point moving from a fixed point to a single direction; The part next to a point on a straight line. brief introduction

Because of the different ionization density, the biological effects of various rays are different, and the change rate is also different. In order to obtain higher favorable mutation, it is necessary to choose appropriate rays, but due to factors such as ray source, equipment conditions and safety, gamma rays and X rays are the most commonly used at present.

Visible light, infrared light, ultraviolet light, etc. Is caused by electrons from the outer layer. Roentgen rays are caused by internal electrons. Gamma rays are caused by nuclei.