根据α、β、γ射线在电场或磁场中的运动轨迹辨别射线的种类是常见的问题．下面对这三种射线的特征及其在电磁场中的运动作一比较． 1．三种射线的特征α射线是由氦核构成的带正电的粒子流, 其速度相当于光速的1/10,有较大的动能．β射线是电子流,带负电,其速度接近于光速． According to α, β, γ ray in the electric field or magnetic field in the trajectory to identify the type of radiation is a common problem. The following compares the characteristics of these three rays and their motion in the electromagnetic field. 1. The characteristic alpha ray of the three rays is a positively charged particle stream composed of a deuteron nucleus, whose velocity is equivalent to 1/10 of the speed of light, and has a large kinetic energy. Beta-rays are electrons that are negatively charged and their speed is close to the speed of light.