ABSTRACT
The course of the two curves of the Cs:Sr ratio in the discharge of the Sellafield Works and in the region of the Pentland Firth indicates a transport time of about 3 years from the Sellafield Works as far as the Pentland Firth (Fig. 2). If one compares further the corresponding ratio figures westwards of Jutland at 55°30'N 6°E, this results in a practically parallel curve, but offset by about a further year.
