Radial distributions of fully ionized oxygen and carbon in the PDX tokamak plasma are reported. These ions were detected via radiation emitted in charge-exchange recombination reactions between the impurities and hydrogen atoms from a non-perturbing neutron beam. The C/sup 6 +/ and O/sup 8 +/ ions are observed out to radii beyond the limiter, which is in contrast to expectations based on coronal equilibrium but consistent with a simple diffusive transport model. Central values of Z/sub eff/ obtained with these measurements agree with values obtained from plasma resistivity and visible bremsstrahlung measurements.