ABSTRACT
The principal objectives were to measure: (1) initial-gamma dose rate, (2) total initial-gamma
dose, (3) total neutron dose in low dose regions, and (4) rate of induced activity decay in soil,
all for very-low-yield nuclear bursts. A secondary objective was to field-test a prototype of
the standard Air Force fallout detector (MG-3).
Much of the effectiveness in the delivery of air-to-air weapons depends on the range at which
they can be safely delivered. Radiation measurements are necessary to substantiate existing
methods of prediction or to form the basis for necessary revisions.
The nuclear yield for Shot Hamilton was about one twentieth of that predicted; therefore,
optimum utilization of the instrumentation was not obtained.
Results of initial-gamma dose rate versus time from two locations, as determined by Kaiser
electronic automatic-dose-rate instruments, are presented graphically. The existing theoretical method is apparently valid for weaponsof this yield as substantial agreement between measured and computed data was obtained.
Results from films and glass-phosphate dosimeters of total initial gamma are in substantial
agreement with theoretical predictions. At 110 yards, an average dose of 243 r was measured,
and at 310 yards 18 r was measured.
The neutron dose was measured from a Slant distance of 576 to 1,550 yards. The measured
dose, using sulfur activation and track population counting in neutron films, agreed with theo-
retical estimates.
The decay rate detected by an MG-3 ion chamber buried at 30 yards from ground zero indicated only fission-product decay. No neutron-induced activation of the soil was apparent from the
data obtained.
Fallout was not recorded by the MG-3 ingiatiatien in the path of predicted fallout as dose-rate
levels were not sufficiently high to activate the instrument. Satisfactory operation of the instrument located at 30 yards proved to be an adequatefield test of the instrument.