At Enewetak, TG 7.2 used an "electronic" radiation monitor an ion chamber) coupled to an Esterline-Angus recorder. (presumably In addition, a cascade impactor driven by a Gast pump and an Electrolum sampler were in operation under the supervision of the TG 7.2 Radsafe Officer. Specialized instrumentation (described on page 138) was installed in the TG 7.4 sampler aircraft to alert pilots to both dose rate and cumulative dose. Three types of pocket dosimeter, the Victoreen bridge (0 to 5 R), the Cam- (0 to 1 R), and the Keleket (0 to 0.2 R), were used by monitors but were found to be unreliable. The dosimeters reportedly gave readings that were consistently high by a factor of two; of those used, 63 percent either became inoperative or were lost (Reference 17, pp. 43-44). CTG 7.3 com- mented that about 15 percent of its pocket dosimeters would not hold a charge and generally proved to be "awkward and slow" in operation (Reference ll, p. 11b-1). No information has been found regarding the methods used to calibrate the survey meters except for a paragraph in Reference 25 that indicates: 1. Some meters may not have been calibrated before use 2. The calibration may have been against 60 Co or 226 Ra 3. The low range on the AN/PDR-39 and the AN/PDR-T1B was not calibrated. PERSONNEL FILM BADGES AND RECORDS. Personnel film badge dosimetry em- ployed badges that combined two types of film to achieve an extended range of exposure readings. DuPont 502 provided low dose coverage, reasonably accurate between 0.1 R and 3.0 R and usable to about 10 R. DuPont 606, with a range of approximately 10 R to 300 R, ensured high dose coverage; however, this particular combination of films had decreased accuracy in the region of 10 R to 15 R. Both films were probably used in evaluating this range (Reference 17, p. 43). The initial plan was to badge "all personnel expected to receive significant amounts of radiation. .. [and]... a representative 10% of 101