Comparison of thallium-201 and technetium-99m

	Thallium-201	Technetium-99m
Dose	2-4 mCi	20-30 mCi
Photon energy	69-83 keV	140 keV
Half-life	73 hours	6 hours
Availability	Cyclotron-produced	Generator produced; often available on site
Significant redistribution	Yes	No

Thallium_v_technetium_imagi.htm

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