Home › CFR › Title 48 › Part 42348 CFR Part 423 — Environment, Sustainable Acquisition, and Material SafetySubpart 423.1 — Use of Recovered Materials and Biobased Products§ 423.107— Agency affirmative procurement programs.Subpart 423.3 — Notice of Radioactive Material§ 423.301— Requirements.Subpart 423.6 — Notice of Radioactive Material§ 423.601— Requirements.