A miniaturized technetium-99m generator that provides significant advantages over the prior art generators is provided. The generator comprises an elutable container including a substantially insoluble gel comprised of a metallic cation associated with fission molybdenum-99 in a ratio of at least 1:1. The container has a height not greater than 0.75 inches and a diameter not greater than 0.4 inches which can be manufactured and shipped in a cost-effective manner while remaining light weight and well shielded and providing high specific activity technetium-99m.
