{Reference Type}: Journal Article {Title}: Tritium decay catastrophe. {Author}: Filer CN; {Journal}: Appl Radiat Isot {Volume}: 212 {Issue}: 0 {Year}: 2024 Oct 5 {Factor}: 1.787 {DOI}: 10.1016/j.apradiso.2024.111428 {Abstract}: The phenomenon of tritium decay catastrophe is introduced. A technical example is provided regarding the radioligand [methoxy-3H] levosulpiride whose long-term behavior is consistent with the concept of tritium decay catastrophe.