Who must keep a record of each source from procurement to final disposal?

In the context of radiation safety and regulatory requirements, it is essential for the Radiation Safety Officer (RSO) to maintain a comprehensive record of each radiation source from the moment it is procured until its final disposal. The RSO is charged with overseeing the safe use of radioactive materials within a facility, which includes tracking inventory, ensuring compliance with safety standards, and managing the safe disposal of those materials.

The responsibility of record-keeping is critical for several reasons, including regulatory compliance, safety audits, and tracking any potential exposure risks. The RSO must ensure that all records are accurate and up-to-date, which helps protect the health and safety of patients, staff, and the broader community.

In contrast, while other individuals listed in the options may have roles in the overall treatment and care process, they typically do not have the same level of accountability for radiation safety and record-keeping. Hence, it's the RSO's role and expertise that make them the designated individual for this task.