Abstract: A mobile decontamination system comprises a pair of strong weathertight transportable sea containers which can be positioned side-by-side at a jobsite. One of the containers is partitioned to divide the container into separate compartments including a decontamination room, a decontamination cell room and a count room, there being normally closed doorways between the compartments. Large or heavy objects are cleaned in the decontamination room, preferably using CO.sub.2 pellets delivered under high pressure through a discharge hose. Smaller objects are cleaned in a special decontamination cell or glovebox located in the decontamination cell room. For this, CO.sub.2 pellets are delivered under high pressure through a hose to the decontamination cell. After objects are cleaned in the cell, they may be tested by monitors in the count room to verify that the objects are indeed clean. The second container houses the heavy equipment required to service the first container.