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Use 60 second intervals to  X0 xcollect your data. Place the Cs137 source on the top level of the plastic holder and adjust the level  xdof the bottom part of the GM tube such that four of the Aluminum foil holders may be easily  xplaced between the source and the GM tube. These foils are numbered and the thicknesses are  X0 xgiven in mg/cm2. In the table below these units have been converted into mm. and you should  xrecord the various thicknesses of foil in mm. Also note that different combinations of foils have  Xa0 xHbeen given so that the increments in thickness will be approximately uniform. Be careful when  XL0 xDhandling these foils! As before take three sixty second readings of the counting rate for each foil  xthickness. Make sure that the counting rate with no foil is at least 1200 counts per minute. If  X 0 xnot get another Cs137 source from your instructor. Do not move either the source or the GM tube  x0once you begin to collect your data. Record your data in your lab notebook in order to transfer  X 0it to CG.  X 0 xH Analysis: In CG plot the activity versus the thickness and formulate your hypothesis as to the  xdmathematical form of the relationship between activity and foil thickness. Be sure to set the  xorigin of your coordinate system at (0, 0). As preliminary test of your hypothesis, try one of the  xlcurve fits (exponential, polynomial or whatever) to this first graph. Then perform the necessary  xXtransformation(s) needed to "linearize" your graph. Calculate the slope of this second graph.  xWhat is the analogy between a point source of light and a point source of radioactivity? Discuss  xPthis with your instructor. This is one of the most powerful results that you can achieve in  x$experimental science. Despite the fact that visible light and radioactive sources do completely different things in nature, they have a common physical behavior.  ( s]   X0` (##,(\  P6Q,P#8 January 1996#XP\  P6QXP#у