1. The problem statement, all variables and given/known data I have been able to complete all questions apart from part e) 2. Relevant equations Beta minus decay involves electron emission Beta plus decay involves positron emission Electron capture takes in an electron 3. The attempt at a solution I believe that because there is an equilibrium quantity of positrons that the beta minus decay mode would be much less likely to happen and that they would start to decay internally. However I am unsure what else could be said and whether my first statement is correct. Any help would be great, thanks!