sawed, FIGURE 14.—High volume air sampler. lection of particulates. The large glass fiber filter is for col- Behind the filter is placed an activated charcoal cartridge to collect gases such as radioiodines. Glass fiberfilters are counted for gross beta activity in the proportional region. All charcoal cartridges, and any glass fiber filters with gross beta activity significantly above background levels are assayed with a 400 channel gamma scintillation spectrometer, using a steel shield for a 4" x 4” Nal (T1) erystal with a Cs!" peak resolution of eight percent for identification of specific gamma-emitting isotopes. Film Badging Film badges were distributed to hundreds of locations around the Test Site and to as many as 1,600 persons during certain operations. Presently there are about 50 locations with some 200 persons wearing film badges. Film badges were and are collected and processed monthly. In the event that radio- activity 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 ae CH eo7 eo7 ere w44 required more extensive monitoring. 41