Nuclear Chemistry Experiment - Part 4: Al shielding of Sr-90 Beta Rays

In this part of the experiment we vary the thickness of Al (aluminum) between a Geiger counter detector and a strontium-90 source of beta rays to see how well aluminum works as a shielding material for beta radiation. At the end of the video, the graph and calculation required to determine the thickness of Al required to block all of the radiation from the source disk is calculated. There is an error in the calculation descriptions. Near the end of the video (17 min) the slope of the best fit line is accidentally described as the b term instead of the m term in y=mx + b.