Consider a 3-Curie |r 192 point source (energy = 300keV). Radiation Health Physicists are contemplating using either lead (density = 11.35 g/cc) or concrete (2.2 g/cc) as shielding to be placed 3 m away from this point source. 1. What is the HVL (in cm) of lead at this energy? 2. What is the mass attenuation coefficient (cmAZ/g) of concrete at this energy? 3. What is the linear attenuation coefficient (cm-1) of concrete at this energy? 4. What is the HVL (in cm) of concrete at this energy