Physical Half Life 8.04 Days
Maximum Beta Energy 606keV
Range of Maximum Energy Beta Particle n/a
Dose Rate at 1cm fro a 1mCi Beta Point Source n/a
Most Prominent Gamma Photons 364keV
Gamma Ray Exposure Rate at 1cm from a 1mCi Point Source 2.16R/h
Annual Limit on Intake - ALI (oral)* 0.03mCi
Type and Thickness of Shielding Recommended for mCi Amounts lead 2 inch

*ALI-intake of a given radionuclide which would result in a committed effective dose equivalent of 5 rems or a committed dose equivalent of 50 rems to an organ or tissue.

For further information concerning Iodine-131 contact William Fendt at or call 831-1434.