Preparation of 114mIn low energy conversion electron sources

The preparation of 114mIn sources of conversion electrons in the energy range 162–190 keV and β continuum with a 1989 keV endpoint via ion implantation of 113In into Al substrates and subsequent irradiation by thermal and epi-thermal neutrons in a nuclear reactor is described.

► Controlled ion implantation of In-113 into thin Al substrate.
► Production of In-114m (half life = 50 days) by neutron irradiation.
► Use of In-114m as a source of electron lines and continuum for calibrations.
► Source reactivation by short neutron irradiation.