A base to standardize data processing of cadmium ratio RCd and thermal neutron flux measurements on reactor

The cadmium ratio RCd and thermal neutron flux are usually measured in a reactor. But its data process is rather complex. The results from same measured data differ by different existing process methods. The purpose of this work is to standardize data processing in RCd and thermal neutron flux measurements. A natural choice for this purpose is to derive a RCd formula based on standard average thermal activation cross section and resonance integral and to define related parameters or factors that provide an unique base for comparison between different measurements in laboratories. The parameters or factors include Ec, Fm, Fm' and Gth' in thermal energy region due to upper truncated Maxwellian distribution and ECd, FCd, Gr and Sr in intermediate energy region. They are the function of multiple variables. The Au foil is used as an example to demonstrate their behaviors by chosen figures and tables which provide for practical data process by hand. The work also discusses limitation of RCd measurement in terms of so called available and optimum region and notes that Co and Mn foils have a much wider available region among Au, In, Mn, W and Co, the commonly used detector foils