Neutron emission from KSTAR Ohmically heated plasmas

► Neutrons from KSTAR Ohmically heated tokamak plasmas were measured. ► There was no correlation of the measured rate with calculated D-D source strength. ► We observed high energy photons from runaway electrons. ► We measured radioactivity produced by these photons. ► The neutrons appear to be produced by photonuclear reactions from runaway electrons.