Charged particle

In physics, a charged particle is a particle with an electric charge. It may be an ion, such as a molecule or atom with a surplus or deficit of electrons relative to protons. It can be the electrons and protons themselves, as well as other elementary particles, like positrons. It may also be an atomic nucleus devoid of electrons, such as an alpha particle, a helium nucleus. Neutrons have no charge, so they are not charged particles unless they are part of a positively charged nucleus. Plasmas are a collection of charged particles, atomic nuclei and separated electrons, but can also be a gas containing a significant proportion of charged particles. Plasma is called the fourth state of matter because its properties are quite different from solids, liquids and gases.

Interaction between charged particle and matter

Energy loss process of charged particle (α, β) in matter

1. Elastic scattering

It is the process of changing in direction of travelling particle due to the correlation with atom. Conservation of Energy is valid and momentum is preserved.

Rutherford scattering equation

2. Inelastic collision

Inelastic collision takes most of the part in energy loss process of charged particle inside of the matter.

Stopping power
Range equation R = Range, E = energy of heavy particle, S = stopping power

See also



    External links

    1. "Ionizing radiation" (PDF).
    2. "Specific Ionization & LET". Retrieved 2016-06-21.
    3. "α입자와 물질과의 상호작용". Radiation & biology & etc. Retrieved 2016-06-21.
    4. "7_1.3 The Bragg Curve". Archived from the original on 2016-03-01. Retrieved 2016-06-21.
    5. "range | particle radiation". Encyclopedia Britannica. Retrieved 2016-06-21.
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