- published: 10 Jul 2014
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Naturally occurring iron (Fe) consists of four isotopes: 5.845% of 54Fe (possibly radioactive with a half-life over 3.1×1022 years), 91.754% of 56Fe, 2.119% of 57Fe and 0.282% of 58Fe. There are 24 known radioactive isotopes and their half-lives are shown below. See Brookhaven National Laboratory Interactive Table of Nuclides for a more accurate reading.
Much of the past work on measuring the isotopic composition of Fe has centered on determining 60Fe variations due to processes accompanying nucleosynthesis (i.e., meteorite studies) and ore formation. In the last decade however, advances in mass spectrometry technology have allowed the detection and quantification of minute, naturally occurring variations in the ratios of the stable isotopes of iron. Much of this work has been driven by the Earth and planetary science communities, although applications to biological and industrial systems are beginning to emerge.
54Fe is observationally stable, with a branching theory that it decays to 54Cr, with a half-life of more than 3.1x1022 years via double electron capture (2β+). All other natural isotopes are known to be stable, which makes 54Fe seemingly strange.
Michael Shawn Hickenbottom (born July 22, 1965), better known by his ring name Shawn Michaels, is a retired professional wrestler, and an American television host. He is currently signed to WWE, where he has served as an ambassador for the company since December 2010. Hickenbottom consistently wrestled for WWE, formerly the World Wrestling Federation (WWF), from 1988 until his first retirement in 1998, due to injury. He appeared in non-wrestling roles from 1998 to 2000, and resumed his in-ring career in 2002, retiring in 2010. He also hosts the show MacMillan River Adventures, airing on the Outdoor Channel.
Hickenbottom began his wrestling career with Mid-South Wrestling, now known as Universal Wrestling Federation, and American Wrestling Association (AWA). During his time with AWA, he performed in partnership with Marty Jannetty, as The Midnight Rockers; winning the AWA World Tag Team Championship twice. Hickenbottom and Jannetty briefly signed with World Wrestling Federation (WWF) in 1987, while in contract with AWA. They returned to AWA, only to go back to the WWF in 1988.
Brock Edward Lesnar (/ˈlɛznər/; born July 12, 1977) is an American professional wrestler, actor, former mixed martial artist and amateur wrestler, signed with WWE and appearing on its Raw brand. He is also a former UFC Heavyweight Champion and former #1 ranked mixed martial arts (MMA) Heavyweight by Sherdog; he was ranked #5 before he announced his retirement at the end of 2011. Lesnar is an accomplished amateur wrestler, winning the 2000 NCAA heavyweight wrestling championship and placing second in 1999, losing in the finals to 1999 world freestyle wrestling champion and future New England Patriots offensive lineman Stephen Neal.
He gained prominence in World Wrestling Entertainment (WWE) from 2002 to 2004, where he is a former three-time WWE Champion, becoming the youngest WWE Champion at age 25 with his first reign. Lesnar was the 2002 King of the Ring and the winner of the 2003 Royal Rumble. After leaving WWE, Lesnar pursued a career in the NFL. He played during the preseason for the Minnesota Vikings, but ended up being a late cut. Lesnar returned to professional wrestling at the end of 2005, and joined New Japan Pro Wrestling (NJPW), where he won the IWGP Heavyweight Championship in his first match. He was officially stripped of the title by NJPW in July 2006, and took the physical belt with him to Inoki Genome Federation (IGF), where he was still recognized as IWGP Champion until June 2007.
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