{"data":{"id":"us/10-cfr-39.51","jurisdiction":"us","citation":"10 CFR 39.51","heading":"Use of a sealed source in a well without a surface casing.","body":"The licensee may use a sealed source in a well without a surface casing for protecting fresh water aquifers only if the licensee follows a procedure for reducing the probability of the source becoming lodged in the well. The procedure must be approved by the Commission pursuant to § 39.13(c) or by an Agreement State.","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":"dc065e133ecca28c7f4cfed1a78bca62f5774536fa5647f73b73c4b2109f0269","source_id":"us-cfr","stale":true,"prev":"us/10-cfr-39.49","next":"us/10-cfr-39.53"},"notice":"GroundRules: Original legal text. Not legal advice."}