TABLE 1

Physical Properties of ¹⁸F, ⁶⁸Ga, ¹²⁴I, and ⁸⁹Zr

Property	¹⁸F	⁶⁸Ga	¹²⁴I	⁸⁹Zr
Half-life	109.8 min	67.6 min	4.18 d	3.27 d
β⁺ yield	0.97	0.89	0.23	0.23
Mean β⁺ energy (MeV)	0.25	0.83	0.83	0.40
Mean β⁺ range in water (mm)	0.62	3.48	3.48	1.23
Single γ-yield in range of 350–650 keV	0.00	0.00	0.64	0.00
Single γ-yield outside range of 350–650 keV	0.00	0.03 (1.08 MeV)	0.10 (722.8 keV)	0.99 (909.2 keV)
			0.19 (>1.5 MeV)

The physical properties of radiotracers are based on data from Health Physics Society (15) and International Commission on Radiation Units and Measurements (16).