Calibration of film commenced immediately following the shot, using facilities of EG&G at Las
Vegas, Nevada. Film badges were sent to ASRDL, Fort Monmouth, New Jersey, for developing and interpretation of film density into dose units.
Shot Humboldt was planned for the same ground zero as that of Shot Hamilton. The Emmett
devices and stake stations in Frenchman Flat were instrumented. However, on D—1, Shot Humboldt was moved to Area 3; the project participation, therefore, was severely limited. Project
2.12b provided Project 4.2 with 28 film badges, the locations of which are shown in Figure 4.
The film dosimeters were installed by Projects 2.12a and 4.2 several hours before the shot and
recovered during early-entry postshot operations of these projects. Calibration, processing
and read-out were accomplished in the same manner as for Shot Hamilton.
NTS Operations:
Field Surveys.
Personnel of the U.S. Army Chemical Corps Training
Command, Fort McClellan, Alabama, performed gamma field surveys to (1) delineate the 10
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r/hr contour at H+15 minutes, (2) to detect any isolated 10 r/hr hot spots at H+15 minutes,
and (3) to determine field decay rates.
Immediately following the passage of the blast wave from Shot Hamilton, four two-man monitoring teams moved into the area by jeep from the forward manned station. One team surveyed
the general outlying area around ground zero with special reference to the groundin the direction
of observed cloud travel. The other three teams began immediate surveys on four each of the
twelve film-badge stake lines. These teams recorded the location of the 10 r/hr point on each
stake line by dropping markers and then measuring the dose rate at each stake outside of the 10
r/hr line. This procedure was repeated on subsequent surveys, readings also being taken at
each point where 10 r/hr had been noted previously.
For Shot Humboldt, the late shifting of ground zero from Frenchman Flat to Area 3 necessitated some changes.
Time was available only to install four lines of stakes, one in each major
compass direction, at 200-yard intervals to 800 yards.
15