Section 120.918 - Design, Performance, and Certification Criteria for Sealed Sources Used in Downhole Operations(A) A licensee may use a sealed source for well logging applications if: (1) The sealed source is doubly encapsulated;(2) The sealed source contains licensed radioactive material whose chemical and physical forms are as insoluble and non-dispersible as practical; and(3) Meets the requirement of 105 CMR 120.918(B), (C),or (D).(B) For a sealed source manufactured on or before July 14, 1989, a licensee may use the sealed source for well logging applications, if it meets the requirements of USAI N5.10-1968, "Classification of Sealed Radioactive Sources," or the requirements of 105 CMR 120.918(C) or (D). (C) For a sealed source manufactured after July 14, 1989, a licensee may use the sealed source for well logging applications, if it meets the oil-well logging requirements of ANSI/HPS N.43.6-1997, "Sealed Radioactive Sources-Classifications."(D) For a sealed source manufactured after July 14, 1989, a licensee may use the sealed source for well logging applications, if: (1) The sealed source's prototype has been tested and found to maintain its integrity after each of the following tests: (a)Temperature. The test source must be held at -40°C for 20 minutes, 600°C for one hour and then be subject to a thermal shock test with a temperature drop from 600°C to 20 C within 15 seconds.(b)Impact Test. A five kg steel hammer, 2.5 cm in diameter, must be dropped from a height of 1 m onto the test source.(c)Vibration Test. The test source must be subjected to a vibration from 25 Hz to 500 Hz at five g amplitude for 30 minutes.(d)Puncture Test. A one gram hammer and pin, 0.3 cm pin diameter, must be dropped from a height of 1 m onto the test source.(e)Pressure Test. The test source must be subject to an external pressure of 1.695 x 107 pascals (24,600 pounds per square inch absolute).(E) The requirements of 105 CMR 120.918(A), (B), (C), and (D) do not apply to sealed sources that contain radioactive material in gaseous form.(F) The requirements in 105 CMR 120.918(A) through 105 CMR 120.918(D) do not apply to energy compensated sources (ECS). ECSs must be registered with the Agency under 105 CMR 120.128(N) or with the U.S. Nuclear Regulatory Commission under 10 CFR 32.210 or with an Agreement State.