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Radio-Carbon Dating

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  1. Radio-Carbon Dating Cobalt 60 is a beta emitter used in medicine. It is created in a nuclear reactor, and decays with a half-life of 5.2 years. It is stored in a lead container until it is used. 1) State why the container is made of lead In 2001, the contents of a sealed lead container were 2.0 g of radioactive Cobalt 60. 2) Determine the approximate mass of the contents five years later. Explain your answer. NZQA 90256 2006

  2. Radio-Carbon Dating Cobalt 60 is a beta emitter used in medicine. It is created in a nuclear reactor, and decays with a half-life of 5.2 years. It is stored in a lead container until it is used. 1) State why the container is made of lead The lead stops beta particles. or The lead stops radioactivity escaping or The lead stops gamma radiation that is produced by beta decay. A NZQA 90256 2006

  3. Radio-Carbon Dating Cobalt 60 is a beta emitter used in medicine. It is created in a nuclear reactor, and decays with a half-life of 5.2 years. It is stored in a lead container until it is used. In 2001, the contents of a sealed lead container were 2.0 g of radioactive Cobalt 60. 2) Determine the approximate mass of the contents five years later. Explain your answer. E Mass of 60Co is 2 g. Five years later the mass is still about 2 g. When 60Co decays it will lose an electron or an  particle. Whichever the new mass of the nucleus is still very close to the mass of the old nucleus 60Co and since only half of the 60Co atoms have decayed the total mass of the radioactive 60Co will not be significantly different to the old 60Co mass. NZQA 90256 2006