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Physics
High Energy, Nuclear, Particle Physics
Source radioactivity estimate from a radiation detector
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[QUOTE="gleem, post: 6555340, member: 298988"] If you do not know the isotope then you can only estimate the exposure rate assuming gamma/xrays. Each isotope has a unique half-life that determines the activity. The isotope can be identified by its gamma ray/x-ray spectrum. To determine the activity of a source you must know the position of the source relative to the detector, know the efficiency of the detector for the radiation it detects, know the area of the aperture that the radiation to reach the detector, know the characteristics of the scattered radiation that reaches the detector if any. Activity is often measured with a detector that is able to intercept most or all of the radiation such as a "well counter", a liquid scintillation detector or a gas flow counter which has the source placed within the detector. The best way to measure the activity of a source is to identify the isotope and then calibrate the detector with a standard source of that isotope leaving only an inverse law correction unless it is a beta emitter where you must account for the absorption of the beta particles in the air or even in the source. [/QUOTE]
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High Energy, Nuclear, Particle Physics
Source radioactivity estimate from a radiation detector
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