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8349506 
Journal Article 
Radiochemical studies of deep-sea manganese nodules 
Huang, Y; Luo, S; Shi, W; Chen, Z 
1989 
1 
Acta Oceanologica Sinica
ISSN: 0253-505X
EISSN: 1869-1099 
8 
2 
253-261 
English 
In the Northern Mid-Pacific, enrichment of thorium compared to uranium is univeral in deep-sea manganese nodules and in the top sides of the nodules there are large excesses of 230Th and 231Pa decreasing exponentially with depth. -from Authors