  The half lives for various clusters lying in the cold reaction valleys of
{210-226}^Ra isotopes are computed using our Coulomb and proximity potential
model (CPPM). The computed half lives of 4^He and 14^C clusters from
{210-226}^Ra isotopes are in good agreement with experimental data. Half lives
are also computed using the Universal formula for cluster decay (UNIV) of
Poenaru et al., and are found to be in agreement with CPPM values. Our study
reveals the role of doubly magic 208^Pb daughter in cluster decay process.
Geiger - Nuttall plots for all clusters up to 62^Fe are studied and are found
to be linear with different slopes and intercepts. {12,14}^C emission from
220^Ra; 14^C emission from {222,224}^Ra; 14^C and 20^O emission from 226^Ra are
found to be most favourable for measurement and this observation will serve as
a guide to the future experiments.
