the final reports. As @oorellary to inmediate treatment of the persamel exposed to the radiation, evaluation of the hasard remaining upon rehabilitation must ve investigated. To that end soil and water samples, animals, plants and All personnel whe have been inwlved in Large dose exposurce and those whose dose wae amall but whe may have to reside in an active area should be observed over a long period of tine, The first year following the tests, re-examination should be at quarterly intervals. This has been discussed with the Director, Division of Biology and Medicine, AID, who advises that it is the intention of his organization to maintain a periodic cbservation systen., , K-67