{"data":{"id":"us/10-cfr-36.21","jurisdiction":"us","citation":"10 CFR 36.21","heading":"Performance criteria for sealed sources.","body":"(a) Requirements. Sealed sources installed after July 1, 1993:\n(1) Must have a certificate of registration issued under 10 CFR 32.210;\n(2) Must be doubly encapsulated;\n(3) Must use radioactive material that is as nondispersible as practical and that is as insoluble as practical if the source is used in a wet-source-storage or wet-source-change irradiator;\n(4) Must be encapsulated in a material resistant to general corrosion and to localized corrosion, such as 316L stainless steel or other material with equivalent resistance if the sources are for use in irradiator pools; and\n(5) In prototype testing of the sealed source, must have been leak tested and found leak-free after each of the tests described in paragraphs (b) through (g) of this section.\n(b) Temperature. The test source must be held at −40 °C for 20 minutes, 600 °C for 1 hour, and then be subjected to a thermal shock test with a temperature drop from 600 °C to 20 °C within 15 seconds.\n(c) Pressure. The test source must be twice subjected for at least 5 minutes to an external pressure (absolute) of 2 million newtons per square meter.\n(d) Impact. A 2-kilogram steel weight, 2.5 centimeters in diameter, must be dropped from a height of 1 meter onto the test source.\n(e) Vibration. The test source must be subjected 3 times for 10 minutes each to vibrations sweeping from 25 hertz to 500 hertz with a peak amplitude of 5 times the acceleration of gravity. In addition, each test source must be vibrated for 30 minutes at each resonant frequency found.\n(f) Puncture. A 50-gram weight and pin, 0.3-centimeter pin diameter, must be dropped from a height of 1 meter onto the test source.\n(g) Bend. If the length of the source is more than 15 times larger than the minimum cross-sectional dimension, the test source must be subjected to a force of 2000 newtons at its center equidistant from two support cylinders, the distance between which is 10 times the minimum cross-sectional dimension of the source.","path":["Title 10—Energy","CHAPTER I—NUCLEAR REGULATORY COMMISSION","PART 36—LICENSES AND RADIATION SAFETY REQUIREMENTS FOR IRRADIATORS","Subpart C—Design and Performance Requirements for Irradiators"],"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":"2ec76c0e1b1da90efa24cac5577e20c03ebfc7de77c410186d375e8eb57a34bc","source_id":"us-cfr","stale":true,"prev":"us/10-cfr-36.19","next":"us/10-cfr-36.23"},"notice":"GroundRules: Original legal text. Not legal advice."}