The purpose of this final rule is to amend the Hazardous Materials Regulations (HMR) to more clearly and completely specify external radiation level limitations for exclusive use shipments of radioactive materials and to specify the necessary capabilities for personnel who load and unload exclusive use shipments of radioactive materials. The changes are necessary to reduce misunderstandings of regulatory requirements and are intended to foster compliance with these requirements and to help ensure adequate radiation protection for personnel who load and unload shipments.