Table 1. Table Showing the Properties of Various Radionuclides Used for SPECT Imaging.

radionuclide	half-life	max. energy (keV)	decay	production	common production reaction
198Au	2.7 d	960	β–, γ	cyclotron	197Au(n,γ)198Au
199Au	3.1 d	452.6	β–, γ	cyclotron	198Au(n,γ)199Au
67Ga	78.3 h	300	Auger e–, γ	cyclotron	68Zn(p,2n)67Ga
111In	2.81 d	245	Auger e–, γ	cyclotron	111Cd(p,n)111In
123I	13.3 h	159	Auger e–, γ	cyclotron	127I(p,5n)123Xe
125I	60.5 d	35	Auger e–, γ	nuclear reactor	124Xe(n,y)125Xe → 125I
131I	8.0 d	610	β–, γ	nuclear reactor	130Te(n,γ)131Te → 131I
188Re	16.9 h	155	β–, γ	generator	188W/188Re
99mTc	6.0 h	140	γ	generator	99 Mo/99mTc