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Non-destructive alpha-spectrometry and radiochemical studies of deep-sea manganese nodules

, : Non-destructive alpha-spectrometry and radiochemical studies of deep-sea manganese nodules. Geochimica et Cosmochimica Acta 49(8): 1765-1774

A deep-sea Mn nodule handpicked from top of a 20 cm diameter North Pacific tripod core was directly counted by an -spectrometer with a silicon surface barrier detector. A distinct 210Po peak was recorded for the nodule upper side in contact with bottom seawater. Based on the spectrum, the 210Po (supported by 210Pb with 22 year half life) is thought to be confined in the top few microns of the nodule. Since the 210Po peak diminishes considerably for the bottom side resting on sediment, nondestructive -spectrometry is useful for determining the sea floor orientation of nodules. This method was tested for a western North Pacific dredged Mn nodule, and was successful in identifying the orientation (and also surface loss of the nodule by dredging).


DOI: 10.1016/0016-7037(85)90147-4

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