The present invention is a volatile rhenium made by the one or more compounds selected from the yttrium compound, oyster shell, a lithium compound to relates to a scavenger, and collecting method using the volatile rhenium or technetium compounds, more particularly as an active ingredient of a scavenger or technetium compound scavenger and as for the method for collecting a rhenium or technetium gas containing a volatile rhenium or technetium compound generated from the fuel high-temperature treatment step using the scavenger, the removal efficiency of the volatile rhenium or technetium compound prior toxic as high as technically equivalent to or higher than the gas treatment scavenger for, by recycling the oyster shells as a raw material of the scavenger, as well as to reduce the removal costs of the compound, to resolve the coastal environment pollution problems generated due to the oyster shell you Etc. There is a big advantage. ; Yttria, yttria, oyster shell, lithium oxide, scavenger, technetium, rhenium
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