-3- y a One of the major coces that was moci-ied !s sarHew lh), its gurpose 135 to adjust voserved winds, using variational anaivsis methocs, so as to conserve M33 rrom eell to cell. After modification, all observed uoper air wind data from 19m to 33 xm were entered as input. This ‘vas done for four time periods, using winds for one to three onserving stations for each time. The oovious advantages of this code (over most other fallout codes) is that mass is not permitted to accumulate in any of the cells and winas are available for each 3-D cell intersection for four times. Tne MATHEWwinds are used then by the modified appicl’! particle-in-eell code to calculate source. allowing the transport, diffusion, and deposition of an instantaneous Modifications required of ADPIC, to handle the Bravo test, consisted of more upper air input than is used in tvpical ARAC assessments. Furthermore, since particles falling from the stratosohere undergo a larga increase * in air density, it was necessary to add a turoulent wake correction to the larger ; . . (4 oarticles; this correction follows the method set forth by AleDonald. Other modifieations were to incorporate a tropical atmosphere into the fall velocity calcuations and to make the particle activity increase as the cube of particle cacius. Finally, time-integrated deposition was acded; this allows calculation of the total dose from detonation time to evacuation.