"Radium content of carbonate shells" by F. F. Koczy and Heinz Titze
 

Abstract

Radium determinations have been made for shells from Swedish waters, the Mediterranean Sea and the Pacific Ocean. Their Ra/Ca ratio has been estimated and compared to the Ra/Ca ratio in sea water. It was found that, in general, the Ra/Ca ratio is proportional to the Sr/Ca ratio found by Thompson and Chow....

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