In a coastal sedimentation study, 210Pb and 226Ra activities as a daughter-parent pair were measured for a mud sediment

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In A Coastal Sedimentation Study 210pb And 226ra Activities As A Daughter Parent Pair Were Measured For A Mud Sediment 1 (140.05 KiB) Viewed 54 times

In a coastal sedimentation study, 210Pb and 226Ra activities as a daughter-parent pair were measured for a mud sediment core. As shown in the figure below, it gives 210Pb and 226Ra measurements in a mud sediment core. The unsupported 210Pb is given by (Apb-210 t-t = (Apb210) t-o et This curve is fit to the profile to obtain an age with depth as shown in the figure. Answer the following questions 1) What is the purpose to measure 226Ra and 210 Pb activities? 2) Why do you need to use unsupported 210Pb? 3) How do you derive the sedimentation rates from the 210Pb depth profile? 4) What assumption has to be made to draw this conclusion? Florida Bay Core 19C supported -unsupported 0 1994 20 210 Pb 226Ra 40 1955 60 Depth (cm) 80 1920 Year оо 100 120 1885 140 T 1 1 1 160 1850 0.0 1.0 2.0 3.0 4.0 5.0 6.0 Disintegrations per minute per gram