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Delta ray
A delta ray is sometimes used to describe any recoil particle caused by secondary ionization. The term was coined by J.J. Thomson. A more modern definition is secondary electrons with enough energy to escape a significant distance away from the primary radiation beam and produce further ionization." Delta rays are entirely unrelated to the family of subatomic particles named delta baryon.
==Characteristics==
A delta ray is characterized by very fast electrons produced in quantity by alpha particles or other fast energetic charged particles knocking orbiting electrons out of atoms. Collectively, these electrons are defined as delta radiation when they have sufficient energy to ionize further atoms through subsequent interactions on their own. Delta rays appear as branches in the main track of a cloud chamber. These branches will appear nearer the start of the track of a heavy charged particle, where more energy is imparted to the ionized electrons.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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