Table 1.

The Physical Characteristics of Zr-89, I-124, and F-18

Properties	Zr-89	I-124	F-18
Half-life	78.4 hour	4.18 day	109.8 min
Mean β+ energy	0.40 MeV	0.83 MeV	0.25 MeV
Mean β+ range in water	1.23 mm	3.48 mm	0.62 mm
Single γ energy	909 keV (99.9%)	602 keV (61%)
	1657 keV (0.1%)	723 keV (10%)
	1713 keV (0.8%)	1691 keV (11%)
Positron branching ratio	23%	23%	97%