CFR > Title 10 - Energy > CHAPTER I—NUCLEAR REGULATORY COMMISSION > PART 39—LICENSES AND RADIATION SAFETY REQUIREMENTS FOR WELL LOGGING > SUBPART C—Equipment (§39.31 to §39.55) > 39.51—Use of a sealed source in a well without a surface casing.

39.51—Use of a sealed source in a well without a surface casing.

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.