For what purpose? Gamma rays?

Medical application. Gamma rays ionize living tissues and cause cancer by producing free radicals. However, because gamma rays can also kill bacteria and cancer cells, they are used to kill some types of cancer. In the controlled process, gamma rays are used as a "gamma knife" to focus gamma rays on tumors and directly kill tumor cells, while surrounding cells are not damaged. Gamma rays are also used as alternative equipment for chemical disinfection. Application of medical diagnosis. Like other electromagnetic waves, gamma rays can be emitted in different ranges. As a diagnostic tool, the emission energy range of gamma rays may be the same as that of X rays. A patient was injected with a homogeneous powder called technetium -99m, which can emit radioactive tracer gamma rays. Then, the gamma camera is used to form an image of gamma ray distribution in the body through the tracer drawn. This image can be used to diagnose diseases, from the distribution and quantity of cancer cells to brain and cardiovascular malformations. Industrial application. Gamma rays are used to detect defects in metal castings and find weaknesses in welded structures in industrial environments. As an industrial radiography process, the structural part is bombarded by gamma rays and passes through the metal safely. . Metal, and then observe the weakness displayed by the portable gamma camera, and the photographic image darkens structurally. Gamma rays can also be used to check airport luggage and cargo. Since 2002, the Container Security Initiative has used gamma rays as diagnostic drugs in vehicle and container imaging systems in roughly the same way, because it is imported and exported from the United States. Gamma rays, in the form of radionuclide cobalt 60, are used to preserve food in the same way, because they are used to disinfect medical equipment and because they irradiate bacteria that cause tooth decay. Cobalt 60 produces gamma-ray radiation, which enables it to kill bacteria, insects and yeasts that do not cause lethal dose in human body. This process can also prevent the germination and ripening of fruits and vegetables, and will not cause obvious changes in other aspects of food content.