We present results on C-14 radioactivity of Ra-221 and Fr-221 Obtained
by irradiating at ISOLDE a 4 pi assembly of solid state track detecto
rs. The preliminary branching ratios relative to alpha decay come out
to be (1.9 +/- 1.3) 10(-12) and (1.0 +/- 0.2) 10(-12), respectively.