Production of 38 Cl and 34m Cl via the (d, α) reaction on natural argon and 36 Ar reveal medical cyclotrons' ability to supply these isotopes in small quantities. 38 Cl provides an inexpensive developmental tool, while 34m Cl is a positron emitter of interest in PET imaging. Production yields, cyclotron target development, cryo-recovery of enriched gases, and nucleophilic chemistry of a model compound are described.