{"id":11886,"date":"2016-04-19T09:37:14","date_gmt":"2016-04-19T09:37:14","guid":{"rendered":"http:\/\/sitepourvtc.com\/?page_id=11886"},"modified":"2022-10-14T11:54:39","modified_gmt":"2022-10-14T11:54:39","slug":"gamma-ray-attenuation","status":"publish","type":"page","link":"https:\/\/sitepourvtc.com\/nuclear-power\/reactor-physics\/interaction-radiation-matter\/interaction-gamma-radiation-matter\/gamma-ray-attenuation\/","title":{"rendered":"Gamma Ray Attenuation"},"content":{"rendered":"
If monoenergetic gamma rays<\/strong> are collimated into a narrow beam<\/strong> and if the detector behind the material only detects the gamma rays that passed through that material without any kind of interaction with this material, then the dependence should be simple exponential attenuation of gamma rays<\/strong>. Each interaction removes the photon from the beam either by absorption or by scattering away from the detector direction. Therefore the interactions can be characterized by a fixed probability of occurrence per unit path length in the absorber. The sum of these probabilities is called the linear attenuation coefficient<\/strong>:<\/p>\n \u03bc = \u03c4(photoelectric)<\/sub> + \u00a0\u03c3(Compton)<\/sub> + \u03ba(pair)<\/sub><\/strong><\/p>\n