---
kind: "unit"
title: "10"
title_heading: "Energy"
key: "chI/part37"
level: "part"
label: "Part 37"
heading: "Physical Protection of Category 1 and Category 2 Quantities of Radioactive Material"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/10/chI-part37"
sections_count: 34
---

# Part 37 — Physical Protection of Category 1 and Category 2 Quantities of Radioactive Material

Title 10 C.F.R. — Energy › Chapter I — Nuclear Regulatory Commission

## Contents

- [Subpart A — General Provisions](/cfr/10/chI-part37-subpartA.md)
- [Subpart B — Background Investigations and Access Authorization Program](/cfr/10/chI-part37-subpartB.md)
- [Subpart C — Physical Protection Requirements During Use](/cfr/10/chI-part37-subpartC.md)
- [Subpart D — Physical Protection in Transit](/cfr/10/chI-part37-subpartD.md)
- [Subpart E — Subpart E [Reserved]](/cfr/10/chI-part37-subpartE.md)
- [Subpart F — Records](/cfr/10/chI-part37-subpartF.md)
- [Subpart G — Enforcement](/cfr/10/chI-part37-subpartG.md)