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Possible cave entrances on Mars. The pits have been informally named (A) Dena, (B) Chloe, (C) Wendy, (D) Annie, (E) Abby (left) and Nikki, and (F) Jeanne. As of 2007 [update] seven putative cave entrances have been identified in satellite imagery of the planet Mars , all so far located on the flanks of Arsia Mons . [ 53 ]
is not widely used for industrial radiography as other nuclides, such as cobalt-60 or iridium-192, offer higher radiation output for a given volume. Iodine-131 is another important gamma-emitting radionuclide produced as a fission product. With a short half-life of 8 days, this radioisotope is not of practical use in radioactive sources in ...