When the source is not being used to make an exposure, it is locked inside the exposure device. Cobalt cameras are often fixed to a trailer and transported to and from inspection sites. The exposure device for iridium-192 and cobalt-60 sources will contain 45 pounds and 500 pounds of shielding materials, respectively. The source capsule and the pigtail is housed in a shielding device referred to as a exposure device or camera. Depleted uranium is often used as a shielding material for sources. The capsule is attached to short flexible cable called a pigtail. Depending on the level of activity desired, a pellet or pellets are loaded into a stainless steel capsule and sealed by welding. Physical size of isotope materials varies between manufacturers, but generally an isotope material is a pellet that measures 1.5 mm x 1.5 mm. Of course, the disadvantage of a radioactive source is that it can never be turned off and safely managing the source is a constant responsibility.
#Cobalt 60 capsule portable
This and the fact that sources are very portable are the main reasons that gamma sources are widely used for field radiography. These high energies make it possible to penetrate thick materials with a relatively short exposure time. In comparison to an X-ray generator, cobalt-60 produces energies comparable to a 1.25 MeV X-ray system and iridium-192 to a 460 keV X-ray system. These isotopes emit radiation in a few discreet wavelengths. Cobalt-60 will emit a 1.33 and a 1.17 MeV gamma ray, and iridium-192 will emit 0.31, 0.47, and 0.60 MeV gamma rays.
Two of the more common industrial gamma-ray sources for industrial radiography are iridium-192 and cobalt-60. As the material rids itself of the neutron, energy is released in the form of gamma rays. Manmade radioactive sources are produced by introducing an extra neutron to atoms of the source material. Corrosion: Energy resulting from the acceleration of electric charge and the associated electric fields and magnetic fields.
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