Table 2. Annual Average Global Budgets of 210Pb and 7Be in the Troposphere for 2013 210Pb 7Be Burden, g 229.061 3.51002 Residence time, days 7.09725 24.9773 Sources, g d-1 from stratosphere 0.219669 0.0531920 within troposphere 32.0661 0.132687 Sinks, g d-1 dry deposition 3.93661 0.0103364 wet deposition 28.3299 0.129856 stratiform 19.8931 0.103796 convective 8.43679 0.0260605 radioactive decay 0.0192754 0.0456861 Accumulation Term Initial mass, g 215.469 8.95983 Final mass, g 215.358 8.95943 Difference, g -0.110641 -0.000404358