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Feasibility of a room temperature silicon system to peform low energy lung spectroscopy


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L. de Carlan, D. Franck, P. Burger, B. Cahan, Ph. Legou, O. Maillard, C. Mazur, O. Meyer, P. Pihet and R. Soulié Radiat. Prot. Dosim. 1998, 79(1-4), pp 485-489 WORKSHOP ON INTAKES OF RADIONUCLIDES: Occupational and Public Exposure - Proceedings of a Workshop held in Avignon, France. September 15-18 1997

Résumé

This study is part of a project aimed at developing a new monitoring system to improve measurements of lung retention for 239Pu. To cover the thoracic volume, the proposed system uses silicon detectors operating at room temperature. This report gives the first conclusions of this feasibility study. The results were obtained using a detection module composed of silicon strip detectors. Analogue electronics were specially designed to optimise signal-to-noise ratio and to investigate background by using anticoincidence between the silicon detectors. Overall counting efficiency determination was carried out by scanning the surface of a Livermore phantom. Combining these measurements, the detection limits are discussed for the complete modular system with emphasis on the competition between efficiency and background to demonstrate the innovative feature of such a system as an alternative to germanium detectors systems. The proposed new monitoring system may enable the detection limit for 239Pu to be lowered by a factor of 2.