Chapter 5 PERSONNEL DOSIMETRY 5.1 Dosimetry Devices 5.1.1-—The film badge program was designed to provide a dosageindicating device to all personnel in JTF-7 in order that complete dosage information might be maintained on everyone entering the Eniwetok Proving Ground (EPG) during the operation. Beginning 1, April 1958, film badges were issued to all individuals upon their arrival at EPG with instructions that this badge would be worn at all times and would be turned in on recall by TU-6 upon exit from any contaminated area or upon departure from the EPG. The badge consisted of the DuPont 559 film packet (502 and 834 film components) dipped in ceresin wax and then packaged in a rigid polyvinyl chloride case. The purpose of the wax dip and the polyvinyl was to make the film packet impervious to moisture in order that it might be worn for several months if necessary without deterioration. As the operation progressed, test badges were withdrawn from individuals and processed to check the over-all efficiency of the packaging. Badges were in use as long as six months with no significant failure observed. During the operation 62,000 badges were issued, processed, and the information recorded. Records were maintained on approximately 18,000 individuals. 5.1.2—Pocket dosimeters, Bendix model 611, 0 to 5 r range, were also used as a means of obtaining quick information as to dosage received by an individual while in a contaminated area. 5.2 Film Processing and Record Posting 5.2.1-To simplify the recording of information, each man was assigned an eight digit identification number that coded individual personal data. The first four digits identified the individual's Task Group, Task Unit, and permanent home station or laboratory. The last four digits were used as an individual ID number within Task Units. To facilitate the issuance of film ~ 47 -