Table 1.

Physical properties of beta particle emitters.

Radionuclide	Half-life	Mean particle energy (MeV)	Maximum energy (MeV)	Maximum range (mm)
Y-90	64.1 h	0.933	2.284	11.3
Re-188	17.0 h	0.763	2.120	10.4
P-32	14.3 d	0.695	1.710	8.2
I-131	8.0 d	0.182	0.606	2.3
Cu-67	61.8 h	0.140	0.576	2.1
P-33	25.4 d	0.0764	0.249	0.63