10 CFR § 39.45 - Subsurface tracer studies.

---
identifier: "/us/cfr/t10/s39.45"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "10 CFR § 39.45 - Subsurface tracer studies."
title_number: 10
title_name: "Energy"
section_number: "39.45"
section_name: "Subsurface tracer studies."
chapter_name: "NUCLEAR REGULATORY COMMISSION"
part_number: "39"
part_name: "LICENSES AND RADIATION SAFETY REQUIREMENTS FOR WELL LOGGING"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "Atomic Energy Act of 1954, secs. 53, 57, 62, 63, 65, 69, 81, 161, 181, 182, 183, 223, 234 (42 U.S.C. 2073, 2077, 2092, 2093, 2095, 2099, 2111, 2112, 2201, 2232, 2233, 2273, 2282); Energy Reorganization Act of 1974, secs. 201, 206 (42 U.S.C. 5841, 5846); 44 U.S.C. 3504 note."
regulatory_source: "52 FR 8234, Mar. 17, 1987, unless otherwise noted."
cfr_part: "39"
---


# 39.45 Subsurface tracer studies.

(a) The licensee shall require all personnel handling radioactive tracer material to use protective gloves and, if required by the license, other protective clothing and equipment. The licensee shall take precautions to avoid ingestion or inhalation of radioactive tracer material and to avoid contamination of field stations and temporary jobsites.

(b) A licensee may not knowingly inject licensed material into fresh water aquifers unless specifically authorized to do so by the Commission.