The bulk of the workload was on the 1600 to 2400 hour shift. Film badge processing commenced at 1900 hours, and the IBM dosage cards were sent to the IBM 704 for information storage at approximately 2300 hours, A print-out dosage roster was prepared each night for the previous day's film badges, and an extra deck of dosage cards was printed for the TG 7.5 dosage file, Over 12, 000 film badges were processed for TG 7.5 personnel. The Dupont Film Packet, Type 559, with component films (502 for low range and 834 for high range) proved excellent for the Operation, The ceresin wax dip and vinyl plastic holder protected the film from the effects of handling and high humidity. The films were calibrated ona ''constant time, variable distance" range, and the calibration curves were checked for accuracy approximately every two weeks. During the initial calibration a density inversion was noted, The area under the lead strip had a darker appearance than the rest of the film. Invest- igation indicated that this occurred only when the back of the film was exposed to the calibration source, A further check, however, showed that the optical density under the lead strip remained the same when the films were exposed both" foreward'' and ''backward, "' The Cobalt 60 calibration source strength was 8, 67 r/hr at 50 cm, as of 25 April 1958. 3.3 Radiation Exposure Guides The total cumulative exposure guide for JTF-Seven personnel during the Operation, as authorized by CJTF-Seven directive, was: 14