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单词 Beta source
释义

Beta source

英语百科

Radioactive source

A new sealed cesium-137 radiation source as it appears in its final state
A cutaway diagram of a radioactive source used for teletherapy (external beam radiotherapy): A key to the lettering can be found on the file page

A radioactive source or radiation source is a sample of a radionuclide, usually contained within a radiation-resistant container. It emits ionizing radiation (one or more of gamma rays, alpha particles, beta particles, and neutron radiation), which can be used in medicine for radiation therapy and in industry for industrial radiography, food irradiation, sterilization, disinfestation, crosslinking, and more. Radionuclides are chosen according to the type and character of the radiation they emit, intensity of emission, and the half-life of their decay. Common source radionuclides include cobalt-60, iridium-192, and strontium-90. The activity of a radioactive source is typically measured in Curies, despite NIST strongly advising the use of the Becquerel. A radioactive source typically lasts for between 5 and 15 years before its activity drops below useful levels.

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