I have done a lot of work in outside areas, both RAM and CA, The CA classification is a bit tricky, as it deals with licensee definition thereof, whereas with the RAM area you have numerical limits that are isotopically based to follow. Usually, the material's matrix is a prime consideration in determination of controls to be established. I look at that prior to the decay mode. Of an utmost concern in outside areas is the establishment of the air sampling program and the daily results. A fast indication of proper controls is a contamination survey program, especially one that concerns the boundary. If problems are indicated by these surveillances, then consideration should be given to containment of the area.