damentals of Physics B Gamma radiation graph in the last part of the experiment

Question

damentals of Physics B Gamma radiation graph in the last part of the experiment you need to investigate the behaviour of gamma radiation as it passes through air A gamma source is placed at a distance d-005 m away from the GM detector and the counts per minute recorded C 522 As we expect gamma radiation not to be absorbed by air an inverse square law type behaviour should be seen, where the count rate will decrease with distance To see if this is correct you need to plot a graph, with data collected at difflerent distances Looking at the data given above, what point would you plot on the x-axis? Express your answer to three decimal places, no units are required Answer Next page us page Please famanse yourser with the poliaes relating to he appropriate use of University of Wollongong onine systems and respect the ngnts of oner users You are logged in as Sichun Wang (Log out) 1 2010/9/6

Explanation / Answer

Counts will decrease as you move the source away from the detector,this is because the solid angle reduces as we increase the distance of the source.

Solid angle will be directly proportional to number of counts obtained in detector. Solid angle dw=Area/r2

Hence plotting counts on y axis and distance of source on x axia gives inverse square law type graph.

0.05m means 5cm.

So better take observations close to detector in small range i.e 1cm, 1.5cm,2cm,2.5cm etc

This gives graph scale varying as 0.005m to 0.5m or accordingly.

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