{"data":{"id":"us/10-cfr-39.47","jurisdiction":"us","citation":"10 CFR 39.47","heading":"Radioactive markers.","body":"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.","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":"dc6a921a53595a1a374a7cacd66db2ff5d40d2fb58939d2dd71b46cdb53fb811","source_id":"us-cfr","stale":true,"prev":"us/10-cfr-39.45","next":"us/10-cfr-39.49"},"notice":"GroundRules: Original legal text. Not legal advice."}