1. What is "Resonance Self-shielding"? 2. What is the "self-shielding of the burnable poison"? How does it help burnable poison not to burnout quickly? 3. I have found that in a paper "POWER SHARE OF THE THORIUM CHAIN" and "The denaturing is necessary in some cases in order to reduce the power peaking in the seed-type fuel by improving the power share of the thorium region at the beginning of fuel irradiation. " What is that Power Share? How is it helpful?