Chapter 4 PRIVACY ACT MATERIAL REMOVED | DOSIMETRY 4.1 INSTRUMENTATION At 1430 on 1 Marchfirst indication of radioactive fallout was detected on a TN3A meter (24-hour, continuous recording meter). Read 0.9 ma at 1450. - Meter located at Radio-Sound Section. 4.2 .FILM BADGES Fourteen film badges were received at Eniwetak on 19 February. Eight were placed in a reefer in the mess hall. The remaining six were distributed as follows: One to Army group. Assigned to Qf. Was positioned 7 feet above floor of tent on tent pole. Reading: 46 roentgens. Two assigned to Radio— Weather Station. One worn by Siggy, the other by SM Reading: 38 roentgens. One assigned to 49 (in housing area). Reading: 44 roentgens. One assigned togg. Worn on left shoulder pocket. Reading: 40 roentgens. One placed on side of building in housing area. Located shoulder-high and moved east-west to avoid direct sunlight. Reading: 44 roentgens. The above film badge readings were given the men while they were at Eniwetak (gource unknown). Dispatch No. 240 431A from CTG 7.1, Eniwetok and COMNAVSTA, Kwajalein, received 25 April, reads: ‘Film badge readings are as follows: Coie =i r einen 40 r 40> Ge 10r Qe efi 40r GEE, 40r Or 40r Ear. aan. gar ft Qa. eee. Qquimense eee) 40 r eee “r 52r gar eee in custody of TU 7, TG 7.1 until completion of operation, at which time they will be forwarded to AFSWP.'’ The dispatch contains the distribution list for the film badges as originally proposed. However, as previously stated, only six of these badges were actually distributed (see preceding paragraphs for distribution). It is further noted that the film badge readings of the dispatch differ somewhat from the readings reported by the men who wore or were responsible for them. The final estimated values of the exposure for the Rongerik Group are corrected for shielding from buildings and differ from the film badge readings and the doses calculated . from the dose rate and decay curves, as discussed in Chapter 1 of the final report of Project 4.1. 43 PRIVACY ACT MATERIAL REMOVED