[en] In our previous work it was shown that neutron irradiation of organoarsenic compounds can be used to produce radiolabelled compounds based on recoil reactions according to Szilard-Chalmers principle. We elaborated on this work for the preparation of [⁷⁶As]-arsenobetaine combining neutron irradiation with isolation procedures. Neutron irradiation of arsenobetaine or arsenocholine yields a mixture of radioactive and non-radioactive arsenic compounds which were separated using preparative ion-exchange chromatography followed by a hydride generation volatilisation procedure. The isolated [⁷⁶As]-arsenobetaine was checked for its purity using high resolution high performance liquid chromatography - atomic fluorescence spectrometry. By combining these data with gamma-spectrometry data specific activities could be calculated