Abstract
AbstractThe medical isotope 99molybdenum (99Mo) decays to 99mtechnetium (99mTc), and 99mTc is the most widely used radioactive isotope for nuclear medicine diagnostic studies for the heart, kidneys, lungs, liver, spleen and bone, among others. A major supplier of 99Mo replaced its fleet of 99Mo transport casks with a new type B(U) package designed and manufactured by EnergySolutions, and certified by the US Nuclear Regulatory Commission. The packages have been in service for 3 years, and an operational database is now available. This paper discusses the particular challenges for the Medical Isotope Depleted Uranium Shielded Transport Package (MIDUS) design and licensing, and how the field performance of MIDUS has compared with design objectives. The MIDUS package was designed to have approximately twice the capacity as its predecessor, but with the same outside envelope dimensions. Depleted uranium shielding was necessary in order to meet size and capacity requirements. Bulk shielding was not the only des...
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