checkpoints under the supervision of the TG 7.1 Control Officer. In sev- eral cases, the Control Officer is reported to have posted additional monitors on lightly contaminated islands to advise working parties of conditions and to ensure that all workers wore the proper protective clothing. All personnel entering moderately or heavily contaminated areas were reported to be accompanied by a trained monitor and the personnel were badged. Records do not indicate the exposure levels that defined *light," "moderate," or "heavy" contamination. were maintained at the checkpoints. Cumulative personnel dose records Each center maintained current radio- logical situation maps of the atoll, so that the accompanying monitor could advise the party leader of the allowable stay time in any area. In lightly contaminated areas only foot protection was required (Figure 18), but in more heavily contaminated areas fuller covering was provided. This radsafe protective clothing was of cloth or plastic material with tight closures around the wrists and ankles, and also the neck if it did not fully cover the head. Although these clothes did not protect the wearer from gamma or neutron radiation, the layer of cloth did protect from beta radiation. Their function was to trap emitting particles, which would lodge in the cloth instead of on the wearer's skin. This made decontamination much easier and also prevented the inadvertent transport of the contaminated Particles back to the base areas. Respirators were sometimes worn with these protective garments to prevent the wearer from inhaling radioactive Particles. Figure 19 shows three different types of protective suits. Figure 20 shows the suits being worn during instrument recovery operations on a contaminated island. Checkpoints were also established aboard the Bairoko and at the airstrip on Parry Island. Aircraft departing on missions into highly contam- inated areas had their interiors lined with paper. Upon return, the paper liners were removed and the interiors decontaminated using brushes and industrial-type vacuum cleaners. One report (Reference 17, p. 58) noted that "everyone and everything in the northern Marshall Islands had become radiologically contaminated to 128