10 CFR § 39.47 - Radioactive markers.

---
identifier: "/us/cfr/t10/s39.47"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "10 CFR § 39.47 - Radioactive markers."
title_number: 10
title_name: "Energy"
section_number: "39.47"
section_name: "Radioactive markers."
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"
---


# 39.47 Radioactive markers.

The licensee may use radioactive markers in wells only if the individual markers contain quantities of licensed material not exceeding the quantities specified in § 30.71 of this chapter. The use of markers is subject only to the requirements of § 39.37.