  We present first results from experimental data showing the capabilities of
an Associated Particle Imaging system to measure carbon in soil and other
elements. Specifically, we present results from a pre-mixed soil sample
containing pure sand (SiO$_2$) and 4% carbon by weight. Because the main
isotopes of all those three elements emit characteristic high-energy gamma rays
following inelastic neutron scattering, it is possible to measure their
distribution with our instrument. A 3D resolution of several centimeters in all
dimensions has been demonstrated.
