BIO431 Lab Report 4 - Choon Liang Tan BIO431 Lab Report#4...

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Choon Liang Tan 02.12.08 BIO431 Lab Report #4 Natural Abundance of K 40 1. Table 1.1: Data for Calculate the ‘Effective Distance’, d Distance from Detector to Isotope Source: (cm) Counts under the Peak: (15 real time seconds) 1.7cm 55110.57031 2.7cm 30626.41406 3.7cm 19000.4 4.7cm 12657.5 5.7cm 8977.04 PCAE Nucfit1 Dir *.exe Invsq S 5 (Enter Data) M ‘Graph Data’ (Value of Effective Distance is then calculated) 2. Efficiency of the Detector: Counts = (Activity) . Yield (γ’s decay) . (π r 2 ) . Efficiency Sec 4π (d+x) 2 Cs137: 662 KeV: (Yield =0.85, Half-life =30 yrs, r =1.905cm, d =1.075cm, x =1.7cm, A =1.12μCi) 55110.57031 = 1.12 (0.5) (22.75/30) . 37000 . (0.85) . (1.905 2 ) . Efficiency 120 sec 4(1.07+1.7) 2 Efficiency = 459.25 = 0.190 2417.12
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Mn54: 835 KeV: (Yield =1.0, Half-life =313 days, r =1.905cm, d =1.075cm, x =1.7cm, A=9.35μCi) 2688.32568 = 9.35 (0.5) (2552/313) . 37000 . (1.0) . (1.905 2 ) . Efficiency 120 sec 4(1.07+1.7) 2 Efficiency = 22.402714 = 0.160 140.01696 Na22: 511 KeV: (Yield =1.8, Half-life =2.62yrs, r =1.905cm, d =1.075cm, x =1.7cm, A=9.43μCi) 817138.81250 = 9.43 (0.5) (1012/932.72) . 37000 . (1.8) . (1.905 2 ) . Efficiency 120 sec 4(1.07+1.7) 2 Efficiency = 6809.490104 = 0.195 34920.46207 1275 KeV: (Yield =1.0, Half-life =2.62yrs, r =1.905cm, d =1.075cm, x =1.7cm, A=9.43μCi) 113328.89062 = 9.43 (0.5) (1012/932.72) . 37000 . (1.0) . (1.905 2 ) . Efficiency 120 sec 4(1.07+1.7) 2 Efficiency = 944.4074218 = 0.05 18888.14844
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