BIO431 Lab Report 1

BIO431 Lab Report 1 - (time / half life of Cs) Activity...

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Choon Liang Tan 007156760 01.14.08 BIO431 Radiation Biology Lab Report # 1 1. Table 1.1: Voltage: (V) Counts per Minute: (CPM) 700 95 720 1098 740 1204 760 1215 780 1180 800 1258 820 1238 840 1245 860 1403 Graph 1.1 – (on separate sheet) Starting Voltage = 700V Operating Voltage = 780V Plateau Region = 730V – 840V 2. Efficiency = Particles detected Particles emitted Particles detected = CPM at Operating Voltage = 1180 counts Particles emitted = Decays per Minute Activity (today) = Activity (original) x (0.5) ^
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Unformatted text preview: (time / half life of Cs) Activity (original) of Cs = 1.12 Ci Half life of Cs = 30.0 years 1 Ci = 37,000 decays per second Date of Release = April 30 th , 1985 Activity (today) = 1.12Ci (0.5) ^ (22.66 / 30) A = 1.12 (0.59231825) Activity (today) = 0.66339644 Decays per second = 0.66339644 x 37,000 Decays per minute = 0.66339644 x 37,000 x 60 = 1472740.099 Therefore: Efficiency = 1180 = 8.012275899 x 10-4 1472740.099...
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