2. cobolt-60, largely from activity induced in iron used for towers, ete., in the tests. (its S-year lifetime makes waiting times for decay more acceptable). 3. various isotopes of pluronium produced from the capture of neutrous by uranium in the nuclear detonation. 4. The unconsumed plutonium and/or uranium used for the nuclear explosive but not having undergone fission. (When nuclear explosives misfire (or undergo "one-point" safety tests), the chemical-type high cxplosive used for assembling these nuclear components instead spreads them). 5. Tritium induced in water by neutrons and from thermonuclear reactions. (However, the mobility of the water in the ocean quickly dissipates this hazard.) ; Misfires, near misfires (low yield), or None-point™ safety tests of nuclear explosives result in a spread of radioactivity, as mentioned in Item 4. In these misfire cases, the residual uranium or plutonium is deposited over a much smaller area than for the case of the spread from a nuclear explosive (perhaps square yards of spread in the former case, but worldwide or at least square miles in latter). A particular concern in these cases is the spread of plutonium-239; the lower radiological hazard of uranium-235 causes very much less of a radiological concern when used as the nuclear material. This plutonium concern is complicated by its long 24-thousand year half life for decay, which is far too long to enable nuclear decay over time to eliminate the hazard. cw