Are there superheavy elements in the meteorite Allende

A search is being made for superheavy elements in the carbonaceous chondrite Allende, a recently fallen meteorite. A separation was made from the bulk material of those elements (Pb, Cd, etc.), which can be dissolved in strong acids and precipitated at psub(H) = approximately 1.5 with H2S. In a precipitate isolated from 2.3 kg Allende no spontaneous fission activities were found: zero decays during one year. The present results yield an upper concentration limit of 2 x 10-15 g/g for superheavy elements in this meteorite. (author)