Senior Radiation Therapist Mission Hospital in Mission Viejo, CA. This position is Part time and will work 8-hour, Day shift. Mission Hospital in Mission Viejo has received Magnet designation in 2012, 2017, 2021 and are in the process of earning our fourth designation in 2025! This is a prestigious designation from the American Nurses Credentialing Center (ANCC), which recognizes organizations that provide the highest-quality care.