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Abstract
The search for superheavy elements /SHE/ in the carbonaceous chondrite Allende was continued. This time we carried out a thermochromatographic separation at 1050 °C in O2-, resp., H2-gas flow. The volatile fraction /mostly Pb/ was collected on a Pt-foil or trapped in KOH-solution. The heavy element probes were investigated for spontaneous fission activities. We observed zero spontaneous fission decays during 421 days. This yielded an upper limit of ≤2.9 fission x kg−1 x year−1 /95% confidence limit/. We were unable to confirm the existence of a spontaneous fission activity in the meteorite Allende.
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