# 286 Lab#1 Radioactivity - John Karlen Lab Partner Greg...

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John Karlen Lab Partner: Greg Physics 286 Experiment 1: Radioactivity 2/14/10 I Introduction : The purpose of the lab is to study different kinds of radiation and their affect on different kinds of matter. We employ a Geiger Mueller tube, which consists of a tube with a window, through which the radiation is shot. A wire, at a potential of several hundred volts above the tube, is suspended within the tube. When a radiation particle ionizes the low pressure gas in the tube it creates an avalanche of electrons and positive ions which create a current pulse. The pulse is registered as a count. We can therefore record the amount of radiation an object gives off over a period of time. We can employ this to learn several characteristics of radiation. II Analysis : Part A: Intro: The accuracy of our data can be improved by taking multiple collection trials. With a thorough data collection process we can learn some important basics about radiation. Statistics are important to consider when analyzing data. Procedure: We make use of the computer to record geiger counts over time from a source. In order to achieve accurate results, we repeat this process twice, keeping track of the mean and standard of deviation in each case. Trial 1 Trial 2 Trial 3 Mean 665 691 664 Standard Deviation 25 24 19

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Standard Error of the Mean 3.54 3.39 2.69 # of measurements between μ-σ and μ+σ 36 36 37 Analysis: Trial 1 and 3 agree within their errors (665±3.39 is within 664±2.69), but the Trial 1 and 3 means are more than 7 errors away from the Trial 2 mean. -Trial 1: (μ)^(.5) = 25.8 this value is very close to σ = 25 -Trial 2: (μ)^(.5) = 26.3 this value is very close to σ = 24 -Trial 3: (μ)^(.5) = 25.8 this value is somewhat close to σ = 19
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