Metal; neutronUncharged elementary particle with a mass of 1.67492716 ·10... absorberAny material "stopping" ionizing radiation. Alpha radiation ... which is mainly effective in the thermal and epithermal neutronUncharged elementary particle with a mass of 1.67492716 ·10... energyAbility to do work or diffuse heat. The unit of energy is th... range. Hafnium is preferably used as a heterogeneous neutronUncharged elementary particle with a mass of 1.67492716 ·10... poisonSee 'nuclear poison'. to avoid criticalityThe condition of a nuclear reactor where a reaction initiate... incidents; high radiationEnergy dispersion through matter or space. In atomic physics... and corrosion resistance.