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Profiling the gamma-ray distribution of the cement lining of an established nuclear pond as a function of depth.

Research output: Contribution to conferenceConference paper


Publication date2007
Number of pages5
Original languageEnglish


ConferenceEuropean Nuclear Congress
CityBrussels, Belgium


An investigation to determine the relationship between the depth of contamination within the concrete lining of a nuclear pond and the ratio of x-ray to gamma-ray photopeak intensity obtained from sodium iodide detector is described. The environment was simulated using established radiation transport codes. Caesium-137 is assumed to be the sole source of contamination. A detector was simulated across the energy spectrum of a source, and rastered across its location from ±10cm at intervals of 0.5cm. A combination of point and distributed sources were simulated within a concrete structure, as well as in free air to create a comprehensive set of data. The results were then validated against experimental data and demonstrate a high level of agreement. This investigation indicates that the x-ray / gamma-ray ratio has the potential to localise contamination on the surface of the concrete lining; further investigation is required to locate the contamination in three dimensions.