IAEA Category 1

Category 1 sources: if not safely or securely managed, would be likely to cause permanent injury to a person who handled them or was otherwise in contact with them for more than a few minutes. It would probably be fatal to be close to this amount of unshielded material for a period of a few minutes to an hour. These sources are typically used in radiothermal generators, irradiators, and radiation teletherapy.

US/International Atomic Energy Agency
IAEA Category 1 - likely to cause permanent injury within few minutes IAEA Category 2 - could cause permanent injury within few minutes or hours IAEA Category 3 - could cause injury within a few days or weeks IAEA Category 4 - could cause injury within a many weeks IAEA Category 5 - won't cause injury under any duration

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