BIO431 Lab Report #5 - Choon Liang Tan BIO431 Lab Report#5...

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Choon Liang Tan 02.24.08 BIO431 Lab Report #5 Attenuation of Radiation in Matter 1. Table 1.1: Counts per Minute detected for 5 different thicknesses of Lead Z: (grams/ cm 2 ) Counts per Min: 0 15228.32617 0.9253 13415.2627 1.8213 12.351.82422 2.6481 11157.2793 4.4917 9271.052735 7.1441 6861.629885 Graph 1.1: Thickness of Lead Shielding versus Counts per Minute Attenuation of Cs137 under Lead Shielding y = 15046e -0.11x R 2 = 0.999 0 2000 4000 6000 8000 10000 12000 14000 16000 0 1 2 3 4 5 6 7 8 Thickness of Lead Shielding: (grams/cm2) Counts per Minute: Equation of the Exponential Trend-line: y = 15046e-0.11x Attenuation Coefficient (662 KeV) = 0.11cm 2 /g 2. a.) I believe with this method of graphing out the attenuation (662KeV) at different thickness of the lead shield, we can observe if the data showed any signs of correlation. The accuracy of the data collected can be observed by the
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R2 value, which was extremely high for the data collected, standing at 0.999. By comparing the equation of the exponential trend-line; y = 15046e -0.11x C = Coe -μx The mass attenuation coefficient is therefore equal to 0.11 cm 2 /g.
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