DISCUBSTON ca ye : ae 2 : rN ey In the long run Operation Ivy may well mark a turning point in blast am! measurements on nuclear weapons, although it is only fair to say this fe statement may be ne more than a personal conviction or pious hops on the % part af the author. :. However, a campletely theoretical and self-consistent ani, which are principally reported in J-12372, concerned specifically with Ivy and, 1A-1406 concerned with the theory of surface affects. Starting with the analytic solution for fireball growth, which bas been 7 used to determine the yluld of these weapons, a major calculation for the : blast wave was correlated with this solution and used to extend the range of hydérodynauie theory dom to very low pressures. ‘lo this extant, end including the nature of the reflection process over an ideal surface, hydro- ., . : expirically. In addition to this, two mJor perturbations exist in blast from atomic bombs: the theory of surface effects, vhose general quanti- e q are better understood. aay “s While an imeense amount of work remains to be done s a other perturbation characterised as due to large scale inhomogeneities, . tative features have been given in LA-1406, appear to be justified; the - P ELIE a ROaed dynamical thecey now seems to be on firm ground; both theoretically and wes demonstrated on Ivy several times, that the basic field variables of blast os ce within the broad framework of this theory, thare is good reason to hope, as have passed from the status of experimental measurencat eee Peereeed Pa eyed ea ae he Pe Te hydrodynamic theory now existe which was used to make predictions for Ivy diagnostic tool. BEST AJ AILABLE CO status of a The amlytic solution for fireball growth was used to establish tie firedall yields from Ivy on a considerably firmer basis than would have been obtained by methods of fireball analysis used price to Ivy. A completo dis- cussion of its mexvite and limitations are not appropriate in this mmmery, ie SNL oe