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+//Electric Power Generation, Transmission and Distribution by S.N.Singh
+//Publisher:PHI Learning Private Limited
+//Year: 2012 ; Edition - 2 
+//Example 7.2
+//Scilab Version : 6.0.0    ; OS : Windows
+
+clc;
+clear;
+
+
+rad_atomic_mass=226.095;                             //Atomic Mass of Radium in amu
+rad_decay_const=1.3566*10^-11;                       //Decay Constant of Radium in 1/s
+Half_life=0.6931/rad_decay_const;                    //Radium Half Life in sec
+Half_life_yr=Half_life/(365*24*60*60);               //Radium Half Life in year
+N=6.023*10^23/rad_atomic_mass;                       //Number of atoms per gram of Radium
+Activity=rad_decay_const*N;                          //Activity of Radium in disintegration/second
+Activity_curi=Activity/(3.7*10^10);                  //Activity of Radium in Ci
+
+
+printf("\nHalf life is %e sec or %.2f yr",Half_life,Half_life_yr);
+printf("\nThe initial activity is %.3f Ci",Activity_curi);