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Experiments
The effect of distance
\label{distance}
In this first experiment we would like to understand how the measured counts depend on the distance between the source and the detector.
\begin{equation}
\begin{array}{cc}\text{distance(cm)}&\text{mean(cts)/Dt}\\
3&449.92\\
4&172.92\\
5&84.92\\
6&49.02\\
7&32.38\\
8&21.82\\
9&15.63\\
\end{array}\nonumber \\
\end{equation}
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