Positron and electron (particle and anti-particle) can annihilate in collision turning into electromagnetic radiation.
正电子和电子(粒子和反粒子)在对撞中会发生湮灭，并产生电磁辐射。
2
Upon collision, the conversion of a particle and its corresponding antiparticle into pure electromagnetic ENERGY (called annihilation radiation).
粒子和对应的反粒子碰撞后，被完全转化为电磁辐射能量。
3
In a conformal and inverse modulate intensity radiation planning (IMRT), mechanical collision is a key problem, which determines whether the therapy planning can be really executed or not.