{"data":{"id":"us/10-cfr-39.53","jurisdiction":"us","citation":"10 CFR 39.53","heading":"Energy compensation source.","body":"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].\n(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.\n(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.","path":["Title 10—Energy","CHAPTER I—NUCLEAR REGULATORY COMMISSION","PART 39—LICENSES AND RADIATION SAFETY REQUIREMENTS FOR WELL LOGGING","Subpart C—Equipment"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-10.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:24:09Z","sha256":"76da90ef00f3babd8afbf3fd3a4bf579f5e357986035ff243ef2a0a08900b647","source_id":"us-cfr","stale":true,"prev":"us/10-cfr-39.51","next":"us/10-cfr-39.55"},"notice":"GroundRules: Original legal text. Not legal advice."}