BIO
BIO431 Lab Report 2

# BIO431 Lab Report 2 - Choon Liang Tan BIO431 Lab 2 Report 1...

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Choon Liang Tan 01.28.08 BIO431 Lab 2 Report 1. Raw Data from Counts per Minute: (operating voltage = 780V) Trial #: CPM: Trial #: CPM: 1 1200 26 1195 2 1156 27 1219 3 1181 28 1200 4 1249 29 1142 5 1151 30 1158 6 1184 31 1211 7 1143 32 1161 8 1184 33 1138 9 1144 34 1108 10 1156 35 1196 11 1176 36 1158 12 1217 37 1165 13 1086 38 1119 14 1170 39 1122 15 1187 40 1191 16 1109 41 1225 17 1162 42 1158 18 1138 43 1164 19 1160 44 1218 20 1202 45 1167 21 1213 46 1170 22 1178 47 1213 23 1260 48 1197 24 1148 49 1177 25 1199 50 1182 Excel Calculations: Average Counts = 1174.14 Standard Deviation = 35.50798 2. R = standard deviation / √counts √counts = 34.26572632 R = 35.50798 R = 1.036 34.26572632 1

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When 0.7 ≤ R ≤ 1.30, it means that 98% of the time, the data is reliable. R = 1.036 fell within that range, thus it is possible to conclude that the Geiger counter used was functioning properly and reliably. 3. (Data of class results for standard deviation versus average number can be found on graph 1.1.) The data appears to indicate that as you measure for a longer period of time, you will collect more counts than within a short period of time. It is obvious in this graph that it has a plateau region, meaning that the more counts made, the more similar the standard deviation values are. At the beginning, with low counts,
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