Which department is responsible for maintaining inventories and reviewing work plans related to radiation safety?

The Radiation Protection Department is specifically tasked with overseeing matters directly related to radiation safety. This department focuses on ensuring that all operations involving radiation are conducted safely and in compliance with applicable regulations. Their responsibilities include maintaining detailed inventories of radioactive materials and equipment, as well as reviewing and developing work plans to minimize radiation exposure and safeguard health.

This specialized focus on radiation safety distinguishes the Radiation Protection Department from other departments, such as Safety Compliance, Health and Safety, and Environmental Protection, which have broader missions or cover different aspects of safety and compliance. The specific expertise and regulatory focus of the Radiation Protection Department make it the most suitable choice for the responsibilities outlined in the question.