light leaks, and were generally quite difficult to read. As a result, the ex- change period for TG 7.1 and TG 7.5 was shortened to three weeks and the period for all others was shortened to four. During the operation 40,000 Oe ee . oan Experience during Operation Castle in 1954 indicatedthat there was definite need for providing legal dosimetry services to all personnel in Joint Task Force SEVEN. Accordingly, the film-badge program for Operation Redwing was designed to provide adequate dosage information on every man entering the Pacific Proving Grounds. A so-called permanent badge was issued to everyone in the Task Force for wear at all times. In addition, a ‘mission’ badge was issued to those persons who were required to enter contaminated areas. Dosimetry records were then kept on both types of badges for each individual, Pocket dosimeters, Bendix model 611, 0 to 5 r range, were also used with the mission badges as a means of obtaining quick information as to dosage received by an individual while in a contaminated area. 4.1.1—The permanent-badge program was designed to provide a dosageindicating device to all personnel in the Task Force. Issue of the first permanent badges was made on 15 April 1956, with exchange scheduled each six weeks, As the operation progressed, it was found that badges worn in excess of four weeks were badly watermarked, showed evidence of severe -~ . rw Dosimetry Devices athe 4.1 ’ ee emt < Aire ae ee LEGAL DOSIMETRY permanent badges were issued, processed, and recorded, Records were main- tained on approximately 15,000 individuals. 4.1.2—The mission-badge program was designed to provide a rapid determiniation of the dosage an individual had received while participating in recovery or construction missions in radex areas. Only persons entering a radex area were provided with mission badges. No deficiencies were noted with these badges, as the usual period of wear was approximately 12 hr. Approximately 45,000 mission badges were processed. - 38 - [ote om OF Am ed eeemerore Chapter 4