All Forums  GQ Electronics Forums  2.GQ Geiger Muller Counter  Calculating the Half-Life of a radioactive decay

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Screensize: 640 x 480 800 x 600 1024 x 768 1280 x 1024 UserName: Password: Format Mode: Basic  Help  Prompt  Format: Font Andale Mono Arial Arial Black Book Antiqua Century Gothic Comic Sans MS Courier New Georgia Impact Lucida Console Script MT Bold Stencil Tahoma Times New Roman Trebuchet MS Verdana   Size 1 2 3 4 5 6   Color Black Red Yellow Pink Green Orange Purple Blue Beige Brown Teal Navy Maroon LimeGreen Message: * HTML is OFF * Forum Code is ON Smilies [quote][i]Originally posted by ullix[/i] [br]A GeigerLog user has kindly provided me with a set of data recorded in connection with an Iodine-131 treatment of a cancer patient. First, the count rates are very high, and are likely to initially overwhelm the counter! Second, with a half-life of I-131 of about 8 days, the decay is easily visible in recordings which last longer than a day. GeigerLog has the feature of making Scatter-Plots, including least-square regressions to polynomial curves. I have now added the ability to make regressions also to exponential, like relevant for radioactive decay, so you can derive the half-life from your data very easily. Click the "Scat" button and select time for X and CPM for Y, then select "EXP" for type (bottom-right), and click Ok. The data, fit, and half-life are displayed, as the pic shows. A half-life of 8.36 days is calculated, versus the true HL of 8.02 days. This is possible only with the latest pre-release #36 of GeigerLog, which you can download here: https://sourceforge.net/p/geigerlog/discussion/general/thread/beafedc7b1/?page=4#e2e8 The releases change frequently; look for any later one. [img]uploaded/ullix/20230512054528Screenshot from 2023-05-12 13-18-22.png[/img] [/quote]    Insert an Image File Check here to include your profile signature.