1. The problem statement, all variables and given/known data What are the partial half of 22Na for decay by a)Ec b) β+ emission 2. Relevant equations λ=ln2/T1/2 3. The attempt at a solution this what I do T1/2 =2.602 Yr λ=ln2/2.602 λ=0.266 yr-1 what is the difference between a)Ec b) β+ emission there is no Percentage of each decay type.!