الفهرس 
Standardization of thermal / fast neutron doses for metrological applications
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Abstract
National Institute of Standards (NIS) is the national standard of Egypt where it provides traceability for customers, Ionizing Radiation Metrology Laboratory (IRML) is one of the NIS departments that provides traceability in Ionizing Radiation measurements field. Neutron measurement is one of IRML activities. IRML available methods for neutron measurement are Neutron Monitor (NM2), Ionization chamber, Neutron Rem Detector (NRD) and activation foil. IRML have a traceable NM2 for fast neutron only, however, for thermal the traceability will be fulfilled in this work by using different techniques. In this thesis, the fast neutron dosimetry was performed by (i) a traceable neutron monitor (NM2) at different source to detector distances. (ii) Tissue-Equivalent chamber at the small distances where a wide range of fast neutron doses in the IRML facility was obtained. It is known that the method for obtaining thermal neutron is the moderation or slowing down of fast neutrons by successive elastic scattering of fast neutrons by a hydrogen rich material. Different types of hydrogen-rich materials can be used for the construction of a thermal neutron irradiation facility. In this work, the thermal neutron was obtained using a slab phantom and a constructed thermal neutron irradiation facility made of (ARTELON). Thermal neutron dose was measured using different techniques such as Neutron Monitor (NM2), Neutron Rem Detector (NRD), and activation foils. Associated gamma component with fast and thermal neutron dose was measured using a (1Liter) spherical ionization chamber manufactured by PTW-Freiburg Germany with type W32003, S.No. 0042