ABSTRACT A long-term investigation was conducted at Eniwetok Atoll during 1954-1957 to determine the rate of recovery of land plants damaged by the radiation, of the Nectar detonation in 1954. shock and heat blast During this period the levels of gross beta radioactivity in the plants, the radio- isotopes present in some of the plants and the soil, changes in the levels of beta radioactivity in the of the plants, with time after the detonation radioactivity), tissues (decline of also were investigated. At Belle Island seven plant species were tagged, measured and photographed before the detonation, mately monthly intervals after the detonation, of ten months, and the At approxi~ for a period and again after an interval of six months, plants were observed and photographed. the The first indication of recovery was observed on the eighth day, at which time buds were noticeable on stems of Scaevola and Messerschmidia plants. In a month's time, most of the plants had formed new leaves and some had produced flowers and fruits. months, to the general condition of that which existed In six the vegetation was similar before the detonation. Two plants,