active (hot) line was found. The minimum and maximum distances of these curves from ground
zero at various times are tabulated in Table 9. The gamma decay followed the usual fissionproduct decay law with an average exponent of -1.1 from H+10 minutes to H+1 day. Reference
13, the report of the field-survey group, contains a multitude of data sheets, curves, and isodose plots of the data.
~Shot Humboldt. Participation was successful in Shot Humboldt, a 7.8-ton shot on a 25-foot
wooden tower. Since this event was movedat the last minute to a different ground zero than
planned, effort was limited to instrumenting Project 4.2 stations with film badges plus a
few
hasty gamma-field surveys.
The film badges were recovered within a few minutes after detonation by a coordinated
effort
of this project and Projects 2.12a and 4.2. Instrumentation, and the two APC vehicles,
were
dragged out of the ground-zero area by pulling cables.
The open-field data were corrected the same as for Shot Fig.
23
See Figure 11.
The doses in