Level 5: Bachelor's degree in Physics, Health Physics, Nuclear Engineering, Mechanical Engineering, Chemical Engineering, or related field and 14+ years of relevant experience, OR Master's degree in a related field and 8+ years of relevant experience, OR PhD in a related field and 6+ years of relevant experience. Level 4: Bachelor's degree in Physics, Health Physics, Nuclear Engineering, Mechanical Engineering, Chemical Engineering, or related field and 9+ years of relevant experience, OR Master's degree in a related field and 6+ years of relevant experience, OR PhD in a related field and 4+ years of relevant experience.