10 CFR § 39.53 - Energy compensation source.

---
identifier: "/us/cfr/t10/s39.53"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "10 CFR § 39.53 - Energy compensation source."
title_number: 10
title_name: "Energy"
section_number: "39.53"
section_name: "Energy compensation source."
chapter_name: "NUCLEAR REGULATORY COMMISSION"
part_number: "39"
part_name: "LICENSES AND RADIATION SAFETY REQUIREMENTS FOR WELL LOGGING"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
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"
---


# 39.53 Energy compensation source.

The licensee may use an energy compensation source (ECS) which is contained within a logging tool, or other tool components, only if the ECS contains quantities of licensed material not exceeding 3.7 MBq [100 microcuries].

(a) For well logging applications with a surface casing for protecting fresh water aquifers, use of the ECS is only subject to the requirements of §§ 39.35, 39.37 and 39.39.

(b) For well logging applications without a surface casing for protecting fresh water aquifers, use of the ECS is only subject to the requirements of §§ 39.15, 39.35, 39.37, 39.39, 39.51, and 39.77.

[65 FR 20345, Apr. 17, 2000]