Final answer:
A radiation protection program appraisal by the RSO might be needed when procedures do not reflect current practices, the "Notice to Employees" is missing, no backup survey instruments exist, or all radioactive materials are not secured.
Step-by-step explanation:
In a radiation protection program appraisal by the RSO, it might be needed when:
- Procedures do not reflect current practices
- The "Notice to Employees" is missing
- No backup survey instruments exist
- All radioactive materials are secured