Discovery of tantalum, rhenium, osmium, and iridium isotopes

Currently, thirty-eight tantalum, thirty-eight rhenium, thirty-nine osmium, and thirty-eight iridium isotopes have been observed and the discovery of these isotopes is described here. For each isotope a brief synopsis of the first refereed publication, including the production and identification method, is presented. (C) 2012 Elsevier Inc. All rights reserved.