F. CALCULATIONS OF DOSE to TAKUYO MARU Personnel Japanese data: 1. 2000 hours JST 14 July Rainout started 26 2030 hours JST 14 July Rainout over 36 2200 hours JST 14 July Highest count of 37470 cpm he 0530 hours JST 15 July Start of decontamination 5e Scintillation background = 2400 cpm 6. Contamination of scintillation counterprobe was 11,235 cpm Te Conversion: 500 cpm = 0.7 mr/wk Other data: 12. 1230 hours JST 2. I= yt 12 July Detonation time 3. Dose= 1, [. lent i-n| at LA Where: “ ta _ +t, = time of entry to = time of exit I, = intensity at H + 1 hour Assumptions: 1. The suspected event to have taken place at 1230 hours JST, 12 July NOTE: The only instance where we are able to attempt an estimate of the decay rate from the Japanese data is compatible with the assumed time of detonation of the suspected event. 2. n=1,.2 3. Continuous exposure of personnel to indicated dose rate for tne time period used. 4 Use 2030 hours 14 July for time of highest count: H + 55 hours = tz 5. Use 1130 hours 15 July for end of decontamination: HE + 70 hours # to 6. Use 0030 hours 27 July as time of monitoring TAKUYO: my Des 123 days = 3 + 300 hours. = to CONSIDENTIAL DOE ARCHIVES he 2c