Table 1.

Decay Data for ¹²⁵I, ¹³¹I, and ²¹¹At¹⁷

			Energy per decay (keV/Bq·s)
Radionuclide	Decay mode	T1/2	Electrons	α-Particles	Photons
125I	EC	59 days	17	—	42
131I	β−	8.0 days	190	—	380
211At	α, EC	7.2 hours	0.048	6900	27

α-particle data for ²¹¹At was calculated from the complex disintegration of ²¹¹At and ²¹¹Po.