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The mechanical and electrical construction of the probe is described. In order to provide a critical judgment of the applicability of this probe in operation, the necessary calibration curves for spectrometrical and total-gamma measurement are included as well as the calibration methods used. To improve the instrument's accuracy for y-spectrometry, in water the attachment of a lead cylinder is recommended, however, for total-gamma measurements on the seabed an arrangement for "offset" geometry is required. The conditions for measurement in the sea and their influence upon the limits of detection are investigated.

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