Principles of radiation interaction in matter and detection pdf

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principles of radiation interaction in matter and detection pdf

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Module 3: Interaction of Radiation with Matter

Skip to main navigation Skip to Content. The particles emitted carry energy proportional to their mass and speed. The photons carry energy proportional to their frequency. The photons and the particles interact with the surrounding matter. This interaction depends on their type alpha, beta, gamma, neutrons, etc. Alpha trajectories can be deviated by both electric and magnetic fields.

Principles of Radiation Interaction in Matter and Detection

Ionizing radiation ionising radiation consists of subatomic particles or electromagnetic waves that have sufficient energy to ionize atoms or molecules by detaching electrons from them. Gamma rays , X-rays and the higher ultraviolet part of the electromagnetic spectrum are ionizing radiation, whereas the lower energy ultraviolet , visible light , nearly all types of laser light, infrared , microwaves , and radio waves are non-ionizing radiation. Typical ionizing subatomic particles due to radioactive decay include alpha particles , beta particles and neutrons and almost all are energetic enough to be ionizing. Secondary cosmic particles produced after cosmic rays interact with Earth's atmosphere include muons , mesons , and positrons. Cosmic rays and the decay of radioactive isotopes are the primary sources of natural ionizing radiation on Earth contributing to background radiation. Ionizing radiation is also generated artificially by such as X-ray tubes , particle accelerators , and nuclear fission. Ionizing radiation is not detectable by human senses, so instruments such as Geiger counters must be used to detect and measure it.

Principles of Radiation Interaction in Matter and Detection

The mechanism of the ionizing radiation interaction with matter is described for heavy charged particles, electrons and photons. Those effects causing energy loss of the radiation with sequential effects of absorption or attenuation are presented. The features of some characteristic detector systems with the relative electronics and the data acquisition system DAQ are presented. Those detectors are related with the medical imaging sensor systems.