Table 2. Annual Average Global Budgets of 210Pb and 7Be in the Troposphere for 2013
                               210Pb         7Be
  Burden, g                   234.520      3.50965
  Residence time, days        7.24427      25.0733
  Sources, g d-1        
    from stratosphere        0.210567    0.0526384
    within troposphere        32.1782     0.132685
  Sinks, g d-1          
    dry deposition            3.30792   0.00933756
    wet deposition            29.0611     0.130305
      stratiform              20.5649     0.104168
      convective              8.49623    0.0261372
    radioactive decay       0.0197349    0.0456808
 
Accumulation Term       
  Initial mass, g             221.152      8.97832
  Final   mass, g             221.048      8.97793
  Difference, g             -0.103912 -0.000386238