Which of the following regulations governs the medical use of byproduct material?

The regulation that governs the medical use of byproduct material is 10 CFR Part 35. This part is specifically tailored to address the use of radioactive materials in medical procedures. It outlines the licensing requirements for institutions that use byproduct materials in medical practices, including the qualifications for use, safety standards, and compliance measures necessary to protect both patients and healthcare providers.

In this context, byproduct materials are those materials produced in nuclear reactions that are not the primary intended product, but can be utilized for medical treatments, diagnostics, and research. By focusing on the unique aspects of these materials in healthcare, 10 CFR Part 35 provides structured guidance on how to handle such materials safely and effectively.

Other regulations mentioned serve different purposes. For instance, 10 CFR Part 19 addresses the notices, instructions, and reports to workers related to radiation protection, while 10 CFR Part 20 establishes standards for the protection against radiation in general. 10 CFR Part 71 deals with the packaging and transportation of radioactive materials, which, while crucial, is not specifically focused on medical use. Thus, 10 CFR Part 35 is the most relevant regulation concerning the use of byproduct materials in medical settings.