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Exponential Attenuation
Experiment:
Results: Sheets CPM 0 30335 1 26878 2 23868 3 21680 4 19814 5 18004 6 16344 7 15093 8 13908 9 12920 10 11835 11 10934 12 10220 13 9551 14 8839 15 8299 16 7733 17 7318 And here is a graph of the resulting data. The dark blue line is the data, the purple line is an attempt at an exponential fit. The fit isn't perfect for several reasons, namely that radium and daughter products emit several types of radiation, including several peak beta energies, and the attenuation of beta sources is not purely exponential, due to energy softening effects.
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