films to the extent that interpretation of density was impossible. However, all open-field stations
of Project 4.2 in three directions were instrumented by Project 2.12b. Each of the stations had
a direct line of sight to ground zero and provided enough data points to meet the objective of
documenting initial gamma dose versus distance.
All open-field data were corrected the same as for Shot Fig and appear in Figure 11. The
doses in vehicles, open foxholes, and some offset foxholes were corrected for neutron and
station-shielding effects. However, most offset foxholes and all */,-covered foxholes were not
adequately instrumented for neutron measurements, and the data had to be left in the raw form.
Gamma dose versus distance, corrected to a relative air density of 0.9, is tabulated in Table
5 and plotted in Figure 12. Gamma doses atall Project 4.2 stations are tabulated in Table 7 for
the test-condition relative air density of 0.83. Alpha-survey data is tabulated in Table 8.
The 10 r/hr isodose lines as determined from field surveys were irregular star-shaped
curves inclosing very small areas as shown in Table 9.
22
No evidence of a downwind highly radio-