Study On Standardization Of Neutron Reference Level Determination Method In ²²²Rn/²²⁰Rn Chamber

The establishment of a standard method for neutron calibration in ²²²Rn/²²⁰Rn chamber is the basis for calibration of ²²²Rn/²²⁰Rn neutron measuring instruments.The main methods for determining the reference level of ²²²Rn/²²⁰Rn neutron chamber in China are totalαmulti-stage method,αenergy spectrum method and liquid scintillation method.None of the above methods can realize the measurement of ²²²Rn and ²²⁰Rn daughters one by one,and the accuracy of the determination is affected by the measurement error of the subsequent decay daughters.This paper studies the standardization of reference level determination method of ²²²Rn/²²⁰Rn chamber neutron body based onα-γspectrometry established by Nanhua University,mainly including the unification of experimental equipment,the uncertainty evaluation of experimental method,the solution of several key problems,the comparison of experimental theory and data,and the standardization of experimental process.The unification of experimental equipment means the selection and determination of all the components in the whole experimental system.Because the relevant parameters of the experimental equipment will affect the uncertainty of the whole experimental method.The uncertainty evaluation of the experimental method is the explanation of the reliability and accuracy of the experimental method,and the judgment of whether it has the premise of standardization.In addition to the contents listed above,several key problems involved in the experimental process need to be solved one by one.Because the choice of sampling rate,sampling time,measurement time and other key issues will have a greater impact on the experimental results.The comparison of experimental theory and data shows that the reference level of ²²²Rn/²²⁰Rn is compared with other methods of reference level determination of ²²²Rn/²²⁰Rn,and the corresponding conclusions are drawn.The standardization of the experimental process is an important step to ensure the accuracy of the results.In this paper,these problems are well solved,which is very important for the determination of the experimental process and the standardization of the experimental process.At the end of this paper,the experimental method is compared with other ²²²Rn/²²⁰Rn measurement methods in theory and experiment,and it is found that the reference level of ²²²Rn/²²⁰Rn in ²²²Rn/²²⁰Rn chamber is better than other existing ²²²Rn/²²⁰Rn measurement methods.Therefore,the new dose level determination method of ²²²Rn/²²⁰Rn progeny becomes a standard and reliable measurement method.It provides a new and important method for reference level determination of neutron body in ²²²Rn/²²⁰Rn chamber.