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Activity standardization of 134Cs and 137Cs
Institution:1. European Commission, Joint Research Centre, Radionuclide Metrology Sector, Institute for Reference Materials and Measurements, Retieseweg 111, B-2440 Geel, BELGIUM;2. ENEA, National Institue Ionizing Radiation Metrology, C.R. Casaccia, Via Anguillarese, 301, 00123 S. Maria di Galeria, Rome, ITALY;3. Federal Office of Metrology and Surveying, Ionising Radiation and Radioactivity, Arltgasse 35, 1160, Vienna, AUSTRIA;1. Department of Ultrasound, The Second Affiliated Hospital of Xi''an Jiaotong University, Xi''an, 710004, China;2. Department of General Surgery, The Second Affiliated Hospital of Xi''an Jiaotong University, Xi''an, 710004, China;3. Department of Biophysics, PGIMER, Chandigarh, India;1. Laboratorio de Metrología de Radiaciones Ionizantes, CIEMAT Avda. Complutense 40, Madrid 28040, Spain;2. Unidad de Aplicaciones Biomédicas y Farmacocinética, CIEMAT Avda. Complutense 40, Madrid 28040, Spain;1. Laboratory of Normal and Pathological Homeostasis of the Immune System, INSERM Unité Mixte de Recherche 1163, Paris France;2. Imagine Institute, Paris Descartes University-Sorbonne Paris Cité, Paris France;;3. Département d''Immunologie, Institut Pasteur, Unité d''Immunité Innée, Paris, France;4. Institut Pasteur, INSERM U668, Paris, France;5. Immunology and Pediatric Hematology Department, Necker Children''s Hospital, Assistance Publique – Hôpitaux de Paris, Paris, France;6. Collège de France, Paris, France;7. Centre d''Etudes des Déficits Immunitaires, Assistance Publique-Hôpitaux de Paris, Hôpital Necker, Paris, France
Abstract:The paper presents the results from a primary standardization of 137Cs using two independent methods – efficiency tracing using PC-NaI coincidence and the TDCR method. The nuclides 60Co and 134Cs were used as the tracers. Primary standardization of the 134Cs is also discussed. The efficiency extrapolation was carried out by measuring samples of varying mass and using the wet extrapolation method. The results obtained are in good agreement; the differences did not exceed 0.5%. The advantages, pitfalls and also possibilities for improvement of the procedures are discussed.
Keywords:Coincidence method  Efficiency tracing method  TDCR method  Cs-137 standardization  Cs-134 standardization
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