Answer to Question 1

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Corrected count rate = 2550 50 = 2500 min-1

Corrected count rate at new position = 6000 50 = 5950 min-1  

 

Formula:  I = kIo/x2

 

2500 min-1 = kIo/(0.20 m)2 and 5950 min-1 = kIo/x2 

 

k is the same in both and Io is the same.

 

Rearranging:

 

2500 min-1 0.04 m2  = kIo = 5950 min-1 x2

 

x2 = 2500 min-1 0.04 m2 = 0.0168 m2

             5950 min-1  

 

x = 0.13 m