wa ) SEemo) \ Project 2,2 ~ Gamma Dose Rate vs Time - P. Brow OBJECTIVE To measure residual gamma radiation intensit:’ as a function of time at land fallout stations, and to measure the initial gamma intensity vs time for eee air burst. INSTRUMENTATION Ay 3 Fallout gamma radiation intensity was measurei using ioniza- tion chamber detectors, associated electronics ani time intensity recorders. The initial gamma radiation rate was measured using plastic scintillators with photomultiplier and phototube instruments. “ The gamma rate is recorded in the form of a log scale and has a time resolution of 0,91 second with a total recording time of 5 minutes, Gamma rates from 10’r/h to 10°r/h are capable of being recorded by this system. RESULTS The fallout gamma radiation appears to agree reasonably well with the Project 2.1 data, This is based on preliminary uncorrected data, - The gamma rate versus time initial radiation data has been evaluated at only one point at the time of writing this report. data point is in good agreement with the Project 2,1 data. This Additional initial gamma radiation data should be available upon readout of magnetic tape recordings. -l]8-