“…In nuclear power, safety analysis consists of ensuring the validity of each confinement barrier, its independence, and its correct operation under normal and accident conditions (Couturier, 2020). Since the occurrence of serious accidents in radiation therapy in France, this concept of safety barrier is used to evaluate the technical and human provisions defined to make this care process safe (Meyrieux et al, 2012;François et al, 2010;Pernet 2013;Reitz, 2014;Brusadin et al, 2017;Thellier, 2017) This article focuses on the human safety barriers deployed in radiation therapy, i.e. validation, control, and verification actions (measurements, calculations, tests) that ensure that the right dose is delivered to the right patient, at the right time and in the right place.…”