Various radioactive sources

Release time:

2021-05-27

Medical sources In medicine, radiation sources are used for diagnostic and therapeutic purposes. Radiological clinical diagnostic examination can be divided into two parts

Radioactive sources vary widely in physical size and nature, amount of radioactivity and availability.

Medical sources In medicine, radiation sources are used for diagnostic and therapeutic purposes. Radiological clinical diagnostic tests can be divided into two parts: in vivo tests (functional measurements and imaging techniques) and in vitro tests (competitive radiological analysis, etc.). The clinical diagnosis of nuclear medicine is to use radionuclides as tracers, and to measure their distribution and intensity in organs through nuclear instruments, which can diagnose diseases, including thyroid iodine 131 analysis and iodine 125 radioimmunoassay. Extracorporeal beam (often called teleradiotherapy) therapy, such as cobalt therapy devices. Or direct contact of a radioactive source to our tissue (commonly referred to as brachytherapy, including application of a radioactive source in the interstitial cavity, intracavitary application, and superficial application) for radiation therapy, such as radium needle implantation.

Industrial sources There are many radioactive sources in the industry for product irradiation, radiography, and metrology. There are a large number of industrial irradiation installations around the world. They are giant devices that contain large amounts of radioactivity and are commonly used in the sterilization of medical products (such as syringes) and food preservation. The radioactive element used in industrial irradiation equipment is mainly metallic cobalt -60. The thousands of cobalt -60 pellets that make up the radioactive source are contained in a large number of "rods", but some devices still contain cesium -137 sources.

A large number of radioactive sources are used for industrial radiographic purposes, the number of which is estimated to be in the tens of thousands. About 80% of this source contains the radioactive element iridium -192; the rest are cobalt -60, selenium -75 and ytterbium -169 sources. The typical activity of each source is about 50 to 100 curies. Their physical form is usually the metal contained in the source box, which makes them very strong and difficult to disperse. Although these sources are therefore unlikely to pose a serious pollution hazard, they may cause significant harm to individuals exposed to the source. Industrial radiographic sources are relatively easy to steal, but are more difficult to accumulate in large quantities because they are usually stored in different industrial locations.

Finally, millions of sources with low levels of radioactivity are used for industrial metrology and other purposes. They usually contain cobalt -60, cesium -137 or americium -241, and their physical forms are diverse and are not strictly controlled in many countries. Although they are only minor hazards, they can cause small-scale and easily measurable pollution. To

Government regulators around the world control most radioactive sources. The competent authorities usually implement methods of registration, licensing, authorization and periodic inspection of sources. However, as sources reach their expected working life, they are no longer needed, and sometimes may even remain out of regulatory control forever or sources that begin to be regulated as a result of the removal of control end up abandoned, lost or misplaced, stolen or moved without authorization. It is not clear that there are hundreds of unmanaged sources in the world each year, and their locations are largely unknown.

Does the hat have the characteristic of radiation?

Purpose and task of radiation protection

Does the hat have the characteristic of radiation?

Purpose and task of radiation protection