Measurements of 222Rn and 226Ra were made in the western Atlantic Ocean as part of the Warm Core rings Program. A significant number of measurements on waters taken from the surface and deeper waters showed 222Rn concentrations in excess of those supported by the parent 226Ra. Since the source of these 222Rn surpluses is near-bottom shelf or slope water, and since the half-life of 222Rn is only 3.8 days, such 222Rn surpluses are indicative of rapid offshore advective and or mixing processes. Concentrations of 226Ra exhibit a small but measurable increase when moving from a Sargasso Sea, through the slope water, and up onto the shelf.