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CO 2 emissions from the top 10 countries with the highest emissions accounted for almost two thirds of the global total. Since 2006, China has been emitting more CO 2 than any other country. [ 9 ] [ 10 ] [ 11 ] However, the main disadvantage of measuring total national emissions is that it does not take population size into account.
Americium-241 has been used as a source of low energy gamma photons, it has been used in some applications such as portable X-ray fluorescence equipment and common household ionizing smoke detectors.