Radiation Protection Guides (RPG) for transient rates of intake of (some) radionuclides in 1961

Radionuclide	Target Organ	Dose Equivalent (RPG) for Upper Limit of Range II rem/year	Intake Rate (pCi/day)(a)
			Range I	Range II	Range III
Iodine-131	Thyroid	0.5	0 - 10	10 - 100	100 - 1,000
Strontium-90	Bone	0.5	0 - 20	20 - 200	200 - 2,000
Strontium-89	Bone	0.5	0 - 200	200 - 2,000	2,000 - 20,000
Cesium-137	Whole Body	0.17	0 - 1,450	1,450 - 14,500	14,500 - 145,000
Barium-140(b)	Bone	0.5	0 - 1.4x104	1.4x104 - 1.4x105	1.4x105 - 1.4x106
Tritium(b)	Whole Body	0.17	0 - 2x105	2x105 - 2x106	2x106 - 2x107
Ruthenium-106(b)	Lower, Large Ints.	0.5	0 - 725	725 - 7,250	7,250 - 72,500