Interaction of Photons and Charged Particles with Matter
An x-ray image records variations in the passage of x rays through the body because of scattering and absorption. A side effect of making the image is the absorption of some x-ray energy by the body. Radiation therapy depends on the absorption of large amounts of x-ray energy by a tumor. Diagnostic procedures in nuclear medicine (Chapter 17) introduce a small amount of radioactive substance in the body. Radiation from the radioactive nuclei is then detected. Some of the energy from the photons or charged particles emitted by the radioactive nucleus is absorbed in the body. To describe all of these effects requires that we understand the interaction of photons and charged particles with matter.
KeywordsPair Production Target Atom Coherent Scattering Compton Scatter Primary Photon
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