Project 2.2 -- Gamma Rate versus Time Agency: Signal Corps Engineering Laboratories (SCEL) Operations: Scintillation detectors were used to measure initial and residual gamma rates as a function of time and distance. The instru- ment stations were self-contained and required only timing signals to turn them on at predetermined times. Instrumentation was installed on 14 islands along the northern, southern, and southwestern perimeters of Bikini Atoll and on Bokoluo at Enewetak. Shots: BRAVO, ROMEO, KOON, UNION (Bikini); NECTAR (Enewetak). Radiation Exposure Potential: Staffing: High during instrument recovery. Two civilians associated with this project, both from SCEL, received 4.040 and 6.280 R. Project Report: Reference 51. Project 2.3 -- Neutron Flux Measurements Agencies: Naval Research Laboratory (NRL) Oak Ridge National Laboratory (ORNL) Headquarters, Military District of Washington Operations: Neutron flux was measured by installing fission detectors at sites on islands in northern Bikini Atoll, although only the stations on Bokbata and the reef were used. Recovery was delayed on both shots, occurring on D+5 for BRAVO and D+3 for ROMEO. Some samples were counted in the field in two trailers set up on Parry; others were flown to NRL. Shots: BRAVO, ROMEO (Bikini). Radiation Exposure Potential: covery operations. Some exposure potential to those in re- The project report states that no serious diffi- culties were encountered despite the rather high residual radiation. In addition, there may have been some potential for personnel in the trailers on Parry. 178