The CEO for your company asks that you brief the Executive Board on nuclear radiation hazards. You are expected to cover the major forms of ionizing radiation (alpha, beta, gamma, etc.) including 1) the potential for exposures (industrial, bomb, medical, etc.), 2) penetrating ability (paper, lead, concrete, etc.), and 3) possible body organs that might be affected and 4) the resultant health effects that can result with excess exposure. What key facts would you present? (3-R-3)