Table 1. Comparison of 131 I and 90 Y... | American Society of Hematology

Table 1.

Comparison of ¹³¹I and ⁹⁰Y radioimmunoconjugates

	¹³¹I tositumomab	⁹⁰Y ibritumomab tiuxetan
γ emission	Yes	No
β emission	0.81 MeV	2.3 MeV
Path length	0.8 mm	5 mm
Half-life	8.0 d	2.7 d
Biologic clearance	Rapid	Slower
Nontumor distribution	Thyroid	Bone
Imaging	Yes	No
Dosing	Whole body clearance	Per body weight

	¹³¹I tositumomab	⁹⁰Y ibritumomab tiuxetan
γ emission	Yes	No
β emission	0.81 MeV	2.3 MeV
Path length	0.8 mm	5 mm
Half-life	8.0 d	2.7 d
Biologic clearance	Rapid	Slower
Nontumor distribution	Thyroid	Bone
Imaging	Yes	No
Dosing	Whole body clearance	Per body weight