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Tritium and deuterium are two isotopes of hydrogen that will be used to fuel the fusion reaction in °ÄÃÅÁùºÏ²Ê¸ßÊÖ. While deuterium can be extracted from seawater in virtually boundless quantities, the supply of tritium in the Earth's crust is limited, estimated currently at twenty kilos. A second source of tritium fortunately exists: tritium can be produced within the Tokamak when neutrons escaping the plasma interact with a specific element—lithium—contained in the blanket. This concept of "breeding" tritium during the fusion reaction is an important one for the future needs of a large-scale fusion power plant. Watch this short video clip to learn more about the tritium breeding concepts that will be tested in °ÄÃÅÁùºÏ²Ê¸ßÊÖ.