{"data":{"id":"us/46-cfr-148.300","jurisdiction":"us","citation":"46 CFR 148.300","heading":"Radioactive materials.","body":"(a) Radioactive materials that may be stowed or transported in bulk are limited to those radioactive materials defined in 49 CFR 173.403 as Low Specific Activity Material, LSA-1, or Surface Contaminated Object, SCO-1.\n(b) Skin contact, inhalation or ingestion of dusts generated by Class 7 material listed in Table 148.10 of this part must be minimized.\n(c) Each hold used for the transportation of Class 7 material (radioactive) listed in Table 148.10 of this part must be surveyed after the completion of off-loading by a qualified person using appropriate radiation detection instruments. Such holds must not be used for the transportation of any other material until the non-fixed contamination on any surface, when averaged over an area of 300 cm 2, does not exceed the following levels:\n(1) 4.0 Bq/cm 2 (10−4 uCi/cm 2;) for beta and gamma emitters and low toxicity alpha emitters, natural uranium, natural thorium, uranium-235, uranium-238, thorium-232, thorium-228 and thorium-230 when contained in ores or physical or chemical concentrates, and radionuclides with a half-life of less than 10 days; and\n(2) 0.4 Bq/cm 2 (10−5 uCi/cm 2) for all other alpha emitters.","path":["Title 46—Shipping","CHAPTER I—COAST GUARD, DEPARTMENT OF HOMELAND SECURITY","SUBCHAPTER N—DANGEROUS CARGOES","PART 148—CARRIAGE OF BULK SOLID MATERIALS THAT REQUIRE SPECIAL HANDLING","Subpart E—Special Requirements for Certain Materials"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-46.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:22Z","sha256":"cdcf3e94f27ae7b3343c7a234f506b0abbb7b31057d78387d8dce0a2010ed814","source_id":"us-cfr","stale":true,"prev":"us/46-cfr-148.295","next":"us/46-cfr-148.310"},"notice":"GroundRules: Original legal text. Not legal advice."}