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Radiation Protection Dosimetry 85:227-232 (1999)
© 1999 Oxford University Press

SEAD: A TLD System for the Determination of Man-Made Photon Doses in a Fluctuating Natural Background

A.J.J. Bos, A.J.M. Winkleman, C.W. Moelker and W.J.C. Okx

A newly developed TLD based detector called SEAD (Sensitive Extra Ambient Dosemeter, Dutch Patent 1001913) has been described. SEAD has been developed to discriminate between photon radiation from a fixed artificial gamma source (man-made radiation) and those of the natural background. The principle of the system is based on the knowledge that the photon radiation of an artificial source has a certain direction. By placing two dosemeters (each containing ten GR-200A chips) separated by a radiation shield one facing to the source and the other to the opposite side, it is possible to measure the natural component and the natural component plus the artificial component at the same time and in the same place. Temporal fluctuations and long-term variations in the natural background are registered by both dosemeters, so that the difference between the two dosemeters provides the contribution of the artificial source to the ambient dose equivalent. SEAD has been tested extensively in the environment of the nuclear research reactor and around buildings of two hospitals. A discrimination power of 40 µSv per year in a 14 days measuring period has been reached. The advantages and disadvantages of the system are described. It is concluded that SEAD can be used successfully to show experimentally whether the application of gamma rays is in compliance with the very strict Dutch regulations.


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