# lab 10 - Experiment 10: Absorption of Beta and Gamma Rays -...

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Procedure 1: Setting Up the Geiger Counter Preset time: 15 seconds per trial Calibration of Geiger Counter Background Measurement High Voltage Level (HV) # of Counts Trial # (HV = 850) # of Counts 800 2913 1 12 810 3015 2 9 820 3080 3 11 830 2950 4 10 840 3063 5 13 850 2957 870 3066 Average Background Measurement = 1 880 3060 Average Background Rate = 0.733333 c 890 3014 Uncertainty in Background Rate = 0.22 Procedure 2: Range of Beta Particles Aluminum Absorbers, Thickness = 1 mil = 0.00254 cm Preset time: 15 seconds per trial High Voltage Level (HV) = 850 *thin sheets may have holes* # of sheets (mils thickness) Thickness (cm) Count Rate (/sec) 0 0.00000 1852 43.03 123.466667 2 0.00508 1326 36.41 88.400000 4 0.01016 925 30.41 61.666667 6 0.01524 726 26.94 48.400000 8 0.02032 495 22.25 33.000000 10 0.02540 334 18.28 22.266667 12 0.03048 250 15.81 16.666667 14 0.03556 158 12.57 10.533333 16 0.04064 109 10.44 7.266667 18 0.04572 62 7.87 4.133333 20 0.05080 52 7.21 3.466667 22 0.05588 33 5.74

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## This note was uploaded on 12/16/2010 for the course PHYS 1493 taught by Professor Lab during the Spring '08 term at Columbia.

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lab 10 - Experiment 10: Absorption of Beta and Gamma Rays -...

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