PhysicsLab4

PhysicsLab4 - 746.4 748.5 6.62 5 Al 0.025 161 1018 1035...

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Lab 4: Nuclear Physics Question 1.1 The average background radiation in the physics lab is 19 CPM. Trial #1 Trial #2 Trial #3 Recorded Data 27 32 36 Counts Per Minute 16.2 19.2 21.6 Question 1.2 The background radiation is similar when an absorber is in the place. The reading that was recorded is 27. The absorber doesn’t affect the background radiation. The high energy cosmic rays make it through the physics building and the absorber isn’t much of an obstacle. Question 2.1 The average CPM for Sr-90 is 113.7 CPM. Trial #1 Trial #2 Trial #3 Recorded Data 1918 1865 1902 Counts Per Minute 1150.8 1119 1141.2 Question 2.2 The average CPM for Sr-90 with the thinnest absorber is 1093.4 CPM Trial #1 Trial #2 Trial #3 Recorded Data 1794 1842 1831 Counts Per Minute 1076.4 1105.2 1098.6
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Question 2.3 Px Number (#) Material Mg/Cm 2 Trial #1 Trial #2 CPM #1 CPM #2 Average CPM ln(CPM) 1 Poly 5 mil 14.1 1794 1842 1076.4 1105.2 1090.8 6.99 2 Poly 10 mil 29.1 1665 1667 999 1000.2 999.6 6.91 3 Plas 0.030 59.1 1278 1316 766.8 789.6 778.2 6.66 4 Plas 0.040 102 1251 1244 750.6
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Unformatted text preview: 746.4 748.5 6.62 5 Al 0.025 161 1018 1035 610.8 621 615.9 6.42 6 Al 0.050 328 487 455 292.2 273 282.6 5.64 7 Al 0.090 590 110 95 66 57 61.5 4.11 8 Lead 0.032 1230 29 35 17.4 21 19.2 2.95 9 Lead 0.125 1890 41 37 24.6 22.2 23.4 3.15 10 Lead 0.250 3632 40 36 24 21.6 22.8 3.13 Question 2.4 The graph initially starts at a high value and drops to a lower value and begins to level off. This graph is similar to an exponential graph. Question 2.5 Yes, the graph that was plotted, is similar to that of an exponential decay graph. The more material the decay encountered, the more radiation that was absorbed. Initially, we started off with very low px value absorbers and worked our way to higher px value ones. As we used higher px value absorbers, eventually all we recorded was the background radiation, which is where the graph began to level off. Question 2.6 At approximately px value of 161 mg/cm 2...
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This note was uploaded on 04/21/2010 for the course PHYS PHYS 6B taught by Professor Geller during the Spring '09 term at UCSB.

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PhysicsLab4 - 746.4 748.5 6.62 5 Al 0.025 161 1018 1035...

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