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'''Vika''' or '''TGK''' is an oxygen generating system for spaceflight.<ref name=ellis>[https://www.nasa.gov/pdf/602090main_44s_international_life_support.pdf Kerry Ellis - '''International Life Support''' - Ask Magazine]</ref> It is a SFOG, or solid-fuel oxygen generator, a kind of [[chemical oxygen generator]].<ref name=ellis/> It has been used on the retired [[Mir]] space station and the [[International Space Station]].<ref name=ellis/> It was originally developed by [[Roscosmos]] to supplement the ''Elektron'' oxygen system on ''Mir''.<ref name=ellis/> A Vika module, also known as a "candle", contains about one liter of [[lithium perchlorate]] and can provide oxygen for one person for 24 hours.<ref name=ellis/>
The canister contains powdered sodium chlorate and powdered iron, which when combined burns to create enough heat and temperature to break down [[sodium chlorate]] into salt (sodium chloride) and oxygen.<reF>[https://www.cnet.com/news/breathe-deep-how-the-iss-keeps-astronauts-alive/]</reF>
After being adopted for use on the ISS, it had the NASA name '''SFOG''', but they also sometimes use the Russian acronym TGK.<ref name=ellis/>
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