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One important radioisotope is carbon 14 , with a half-life of 5,100 years , used as a tracer in investigations of photosynthesis , metabolism , chemical transformations of carbon compounds , etc. Radiocobalt 60 , radioiodine 131 and radiophosphorus 32 are widely used in treatment of patients with cancerous diseases and in studying these diseases . 1974 ) ( describing fixed payments promised to investors for bringing in new investors as " a share in the proceeds " of the business ) . Most of these are featured in AccessAsia , a clearinghouse on contemporary Asian affairs and policy-related issues . The investment in White did not , as respondent asserts , provide " a return in the form of * * * a share in expected capital appreciation " ( Resp . " Looking ahead , Sembach says , " Interestingly enough , a year from now we 'll probably have something completely different and unexpected to talk about . It was nice to have a sense of solidarity in the ' 60s , but today , that is seen by the neo-born-conservatives as tyrannical , while they cannot see the tyrant , Ollie North . It is important to note that this looking inwards coexists with the sense of satisfaction ( most saying they are better off ) and a sense of optimism ( most saying they believe things will continue to improve ) .