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Table 1 Decay characteristics of 131I [34], 177Lu [35], and 188Re [36]

From: Determination of gamma camera calibration factors for quantitation of therapeutic radioisotopes

Isotope Half-life Strongest γ emissions
E γ [keV] (I γ [%])a
Mean β energy
Emean [keV]
Max β energy
Emax [keV]
131I 8.03 days 284 (6.1) 181.9 970.8
364 (81.5)
637 (7.2)
723 (1.8)
177Lu 6.65 days 113 (6.2) 134.2 498.3
208 (10.4)
188Re 17.00 h 155 (15.6) 763 2120.4
478 (1.1)
633 (1.4)
  1. aOnly gammas with intensities higher than 1% were listed