The gold flux as measured on the 0-degree axis was used to correct the DT-60/PD measure-
ments on both axes. The measured and corrected DT-60/PD doses are presented in Tables
3.2 and 3.3.
The gamma doses measured with the glass-needle dosimeters (read by the New York Naval
Shipyard) are presented in Tables 3.2 and 3.3. Each reading is the numerical averageof eight
individual readings at a particular slant range.
The measurements obtained with these dosim-
eters were generally a factor of two lower than the data in Figure 3.5 and had considerable scatter; for that reason they were not presented in Figure 3.5.
The doses recorded beyond 400 yards
were higher than those presented in Figure 3.5. The response of the glass needles is not linear
. with energy and is higher at low energies. Althgqugh the high energy response has not been fully
investigated, the lead shield in which the needle was exposed was probably not sufficiently thick
to make the needle response as high as it should be. Because of the lack of time prior to the
field exposure, the pre-dose reading of the individual needles was not estaplished.
The back-
ground reading applied to all the needles was obtained by averaging the readings of 25 unexposed
needles. The range of the unexposed needle readings was 30 to 40 r (Reference 20).
Thetotal initial-gamma doses measured with the LSD film pack are presented in Tables 3.2
and 3.3. These measurements were consistently higher than those obtained at corresponding
distances using the LSD stack or NBS film. The holder in which the films were placed did not
make the film response independent of energy. As only Co® and Ra? were used for calibration,
the very-high-energy gammasreleased with the nitrogen-capture phase of the initial gamma
radiation were not accounted for during calibration (Reference 21). For this reason, this data
was not used in the preparation of Figure 3.5.
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