Here's the 564-keV gamma ray from 2.72-day Sb-122. The antimony was in the form of 100-mesh powder. A small plastic box was filled with the powder and grilled in the flux trap.
Irradiation time: 30 min. at 70 kV / 12 mA.
Count time: 10,000 s.
The activated antimony was counted immediately post-irradiation with the 2x2 NaI detector.
This is the longest-lived isotope I have made and detected, barely edging out Au-198. My result here is far more impressive than my old Au run from college. The cross-sections for Sb are not particularly inviting:
Sb-121(n,g)Sb122 thermal: 6b, resonance: 200b
With enough fluxage, though, it's clearly doable.
-Carl
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2007-07-17 00:18 Activation of Antimony 
(Carl Willis) [Latest: 2007-07-17 09:10]