thor

 PI:               James Kirk Cochran
 dataset:          Thorium-234 activity in particulate and dissolved phases
 project/cruise:   EQPAC/TT008
 ship:             Thomas Thompson

 Methodology:
 Buesseler, K.O., J.K. Cochran, M.P. Bacon, H.D. Livingston, S.A. Casso,
 D. Hirschberg, M.C. Hartman and A.P. Fleer (1992).  Determination of
 thorium isotopes in seawater by non-destructive and radiochemical
 procedures.  Deep-Sea Res. 39, 1103-1114.
   

 Parameter             Description                                      Units

 lat_n                 nominal latitude with hemisphere label           whole degrees
 event                 event number from event log
 sta                   station number from event log
 cast                  pumping cast number from event log
 depth_n               nominal depth of wire out                        meters
 Th234_p_.7to1         particulate Thorium-234 activity in              dpm (disintegrations per minute)/liter
                           the size fraction between 0.7 and 1 microns
 err_Th234_p_.7to1     error of particulate Thorium-234 analysis        +/- dpm/liter
                           in size fraction between 0.7 to 1 microns
 Th234_p_1to53         particulate Thorium-234 activity in the size     dpm/liter
                           fraction between 1 and 53 microns
 err_Th234_p_1to53     error of particulate Thorium-234 analysis        +/- dpm/liter
                           in size fraction between 1 and 53 microns
 Th234_p_gt_53         particulate Thorium-234 activity in the size     dpm/liter
                           fraction greater than 53 microns
 err_Th234_p_gt_53     error of particulate Thorium-234 analysis        +/- dpm/liter
                           in size fraction greater than 53 microns
 Th234_p_tot           total particulate Thorium-234 activity           dpm/liter
                           from all size fractions
 err_Th234_p_tot       error total particulate Thorium-234              +/- dpm/liter 
                           analyses from all size fractions
 Th234_d_tot           total dissolved Thorium-234 activity             dpm/liter
                           from all size fractions
 err_Th234_d_tot       error total dissolved Thorium-234 activity       +/- dpm/liter
                           from all size fractions
 Th234_p_d_tot         total Thorium-234 activity in both particulate   dpm/liter
                           and dissolved phases 
 err_Th234_p_d_tot     error total Thorium-234 activity in both         +/- dpm/liter
                           particulate and dissolved phases