Ocean floor disposal 820248 164815941 2007-10-15T21:55:05Z SmackBot 433328 clean up, Replaced: {{Unreferenced|article| . {{Unreferenced| {{Unreferenced|date=January 2007}} '''Ocean floor disposal''' is a method of sequestering [[radioactive waste]] in [[ocean floor]] sediment where it is unlikely to be disturbed either geologically or by human activity. Several methods of depositing material in the ocean floor have been proposed, including encasing it in concrete and as the [[United Kingdom]] has previously done, dropping it in [[torpedo]]es designed to increase the depth of penetration into the ocean floor, or depositing containers in shafts drilled with techniques similar to those used in [[Petroleum|oil]] exploration. Ocean floor sediment is saturated with water, but since there is no [[water table]] per se and the water does not flow through it the migration of dissolved waste is limited to the rate at which it can [[diffusion|diffuse]] through dense [[clay]]. This is slow enough that it could potentially take millions of years for waste to diffuse through several tens of meters of sediment, so that by the time it reaches open ocean it would be highly [[dilution|dilute]] and [[radioactive decay|decay]]ed. Large regions of the ocean floor are thought to be completely geologically inactive and it is not expected that there will be extensive human activity there in the future. Water absorbs essentially all radiation within a few meters provided the waste remains contained. One of the problems associated with this option includes the difficulty of recovering the waste, if necessary, once it is emplaced deep in the ocean. Also, establishing an effective international structure to develop, regulate, and monitor a sub-seabed repository would be extremely difficult. Beyond technical and political considerations, the [[London Convention]] places prohibitions on disposing of radioactive materials at sea and does not make a distinction between waste dumped directly into the water and waste that is buried underneath the ocean's floor. It remains in force until [[2018]], after which the sub-seabed disposal option can be revisited at 25-year intervals. [[Category:Radioactive waste]] [[Category:Waste treatment technology]] [[es:Vertido en el fondo oceánico]]