{"data":{"id":"us-va/12vac5-481-3780","jurisdiction":"us-va","citation":"12VAC5-481-3780","heading":"Nationally tracked source thresholds","body":"The terabecquerel (TBq) values are the regulatory standard. The curie (Ci) values specified are obtained by converting from the TBq value. The curie values are provided for practical usefulness only and are rounded after conversion.\n\nRadioactive material\n\nCategory 1 (TBq)\n\nCategory 1 (Ci)\n\nCategory 2 (TBq)\n\nCategory 2 (Ci)\n\nActinium-227\n\n20\n\n540\n\n0.2\n\n5.4\n\nAmericium-241\n\n60\n\n1,600\n\n0.6\n\n16\n\nAmericium-241/Be\n\n60\n\n1,600\n\n0.6\n\n16\n\nCalifornium-252\n\n20\n\n540\n\n0.2\n\n5.4\n\nCobalt-60\n\n30\n\n810\n\n0.3\n\n8.1\n\nCurium-244\n\n50\n\n1,400\n\n0.5\n\n14\n\nCesium-137\n\n100\n\n2,700\n\n1\n\n27\n\nGadolinium-153\n\n1,000\n\n27,000\n\n10\n\n270\n\nIridium-192\n\n80\n\n2,200\n\n0.8\n\n22\n\nPlutonium-238\n\n60\n\n1,600\n\n0.6\n\n16\n\nPlutonium-239/Be\n\n60\n\n1,600\n\n0.6\n\n16\n\nPolonium-210\n\n60\n\n1,600\n\n0.6\n\n16\n\nPromethium-147\n\n40,000\n\n1,100,000\n\n400\n\n11,000\n\nRadium-226\n\n40\n\n1,100\n\n0.4\n\n11\n\nSelenium-75\n\n200\n\n5,400\n\n2\n\n54\n\nStrontium-90\n\n1,000\n\n27,000\n\n10\n\n270\n\nThorium-228\n\n20\n\n540\n\n0.2\n\n5.4\n\nThorium-229\n\n20\n\n540\n\n0.2\n\n5.4\n\nThulium-170\n\n20,000\n\n540,000\n\n200\n\n5,400\n\nYtterbium-169\n\n300\n\n8,100\n\n3\n\n81","path":["Title 12. Health","Agency 5. Department of Health","Chapter 481. Virginia Radiation Protection Regulations","Part XVII. Schedules","Article 7. Notification"],"source_url":"https://law.lis.virginia.gov/admincode/title12/agency5/chapter481/section3780/","current_through":"2026 Regular Session (effective July 1, 2026)","vintage":"","retrieved_at":"2026-09-14T04:50:33Z","sha256":"bbe0624f7be699c21562cc7193a6599a52073714287dd2ed62aaa39de23929ec","source_id":"us-va-vac","stale":false,"prev":"us-va/12vac5-481-3770","next":"us-va/12vac5-490-10"},"notice":"GroundRules: Original legal text. Not legal advice."}