عنوان مقاله [English]
Promethium is one of the elements of the lanthanide group, although it is classified as rare earth elements, but none of the radioisotopes of this element are naturally found on the planet. All of the isotopes of this element are radioactive. The Pm147 isotope, due to its proper characteristics, is a radionuclide of interest in the industry. The use of thermal energy due to decay of beta radiation, optical sources, or beta-voltaic tools, the beta sources in thickness gauges, and in particular the use of it at very low amounts in milligrams in atomic batteries, are examples of the use of this radioisotope. The dominant methods of producing this radionuclide include separation from fission products or neutron radiation of neodymium-146. In this study, for the production of promethymium-147, natural neodymium was irradiated in the Tehran Research Reactor. By considering the gamma and beta spectra and simultaneously with theoretical evaluation by solving the differential equations of decay chains, an acceptable match was obtained in the results and radioactivity of the products were compared.