dirty weapon A weapon so designed that upon detonation the amount of contaminating material, in the form of either fission fragments or irradiated material (or both), is relatively high by comparison with other possible design variations of the same mark numbered weapon, A weapon may also be "dirty" by comparison with different mark numbered weapons of the same general yield, dose (dosage) Ionizing radiation delivered to a specific area or volume or to the whole body, Units for dose specification are roentgens for X or gamma rays, roentgens equivalent man (rems) for alpha, beta and neutron bombard- ment of human tissue, In radiology the dose may be specified in air, on skin or at some depth beneath the surface; no statement of dose is complete without specification of location, In current thinking there is a tendency to regard a dose of radiation as the amount of energy absorbed by tissue at the site of interest per unit mass, drag That component of the total air forces on a body, in excess of the forces owing to ambient atmosphere and parallel to the relative gas stream but opposing the direction of motion; quantity which imposes limitations upon top speed of vehicles, missiles, and so forth. drone aircraft Radio-controlled aircraft not requiring the presence of crewmen aboard during flight. drop sequence The prescribed order of the events which take efficiency place in the arming, fuzing, and firing systems of an atomic weapon from time of release to detonation. The efficiency of an atomic weapon or device may be defined as the ratio of the energy actually developed when the bomb or device explodes (the energy yield) to the total energy available, In other words, efficiency is the fraction of energy available which is actually released in an explosion,. In the case of a fission weapon this is equal to the ratio of the number of meclei which actually undergo fission to the total number of fissionable nuclei present, 321 AFWLKG SWEH-2 -003, aie “EN a