Amysterious truck is parked in front of the federal building in your town. the mayor has evacuated the area and asks you to deploy a remotely manipulated radiation detection system that can detect ß- and y radiation. expecting a fertilizer bomb, you decide to look for radiation from 32p (pure ß- emitter) and 40k (b- and y emitter). (a) if the truck walls are 1/4" thick aluminum (p= 2.7 g/cm²) and your remote system cannot enter the vehicle, quantify whether or not you'will be able to measure any ß- radiation from either source. (b) describe the degree of attenuation expected for uncollided pho- tons.