Cuapter 3
NEUTRONS
3.1
TSEORY AND ANALYSES
3.1.1
Introduction
The objectives of this project were twofold.
The first of these was
measurement of neutron spectri from the warhead.
Such measurements have
previously been made of high-energy neutrons.
At sea level, where stasure-
ment mist be made at a distance from the detonation, interpretation of lowenergy data in terms of weapun output is neariy Lopessible beczuse of the
complicated neutror transport through air to the detectors.
Om Teak, oeutron
detectors at Stations 252 and 209 directly measured the case spectrm since,
with the low air density at this altitude, essentially oo scattering occurred
gut to the detectors.
Station 252 was located at 90 degrees to the warhead
axis and Station 209 at an angle of 45 degrees, so rhat an estimate of the
variation in output with angle can be made.
These ceasurements are compared
with calculated values of the output.
The second objective was to measure neutron flux at such positions that
data from neutrons which had passed through considerable amountsof air could
be compared with transport calculations.
Only data from one Teak rocket is
of value to this comparison and its value is questionable, since the data
were gathered in a direction vhich did not receive an unshielded view of
the output neutrons.
Fortunately, one good set of dara was obtained for
comparison from the Orange event.
3-1.2
Discussion of Teak Experiment
Good data were obtained from the two highest rockets, Stations 209 and
252 (Fig. 1.1) which define the seutron spectma from the “varbead.
In the
origical plan, at burst tise one of these rockets was to be on the warhead
axis and che other was to be perpendicular to the axis.
A cocbination of
placement and orientation errors resulted in positions at angles of 45 and
ap