10 CFR §34.21
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
The maximum exposure rate limits for storage containers and source changers are 2 millisieverts (200 millirem) per hour at any exterior surface, and 0.1 millisieverts (10 millirem) per hour at 1 meter from any exterior surface with the sealed source in the shielded position.