Table 1.

Physical properties of radioisotopes used in glioblastoma therapy.

Radionuclide	Emission type	Half-life (h)	E max (keV) of main emission	Maximum range in soft tissues (mm)
Iodine-125	Auger	1426	3.19	Nanometer scale
Iodine-131	β−	193	606.3	2.9
Yttrium-90	β−	64	2,280.1	12.0
Lutetium-177	β−	162	498.3	2.0
Rhenium-186	β−	89.2	1,069.5	5.0
Rhenium-188	β−	17	2,120.4	10.8
Astatine-211	α	7.2	5.870 to 7.45	0.055 to 0.080
Bismuth-213	α	0.76	8.4	0.1
Actinium-225	α	240	8.4	0.1