All charcoal cartridges, and any glass fiber filters with gross beta activity significantly above background levels: were assayed with a 400 channel gamma scintillation spectrometer, using a steel shield for a 4" x 4" NaI (TI) crystal with a C537 peak resolution of eight percent for identification of specific gamma-emitting isotopes. Film badges were routinely distributed to about 50 locations and to approximately 200 people living in these localities. were collected and processed monthly. Film badges In the event that radioactivity was found in the area by the mobile monitoring teams, film badges were collected from these locations and from people living in the area; new film badges were distributed. Additional stations and people were included if the situation required more extensive monitoring. Milk samples were collected routinely one time per month within the 300 mile radius of the NTS, from approximately 25 sources, including all dairies and some additional ranches with one milk cow. In the event that radioactivity was found in any area. additional samples were collected. Water Samples Water samples were in general collected monthly from approximately 30 sources. There were no known surface supplies for human use in the off-site area except for Lake Mead. Research - In support of the operational procedures described above to assure safety to the public, there were and are extensive basic and applied research studies conducted in such fields as meteorology, hydrology, and ground motion. These were and are accomplished by (a) cooperation with 51.