Study of the Regular Pattern Between the Geometric Characteristics of Radioactive Package and Its External Radiation Dose Rate

Abstract

In recent years, as an important part of the nuclear technology used in the fields of industry, agriculture, medicine and scientific research, the transportation of radioactive materials has increased rapidly. diversification trend. In order to ensure the safety of relevant staff and the public, countries around the world and the IAEA have made certain regulations and constraints on the external radiation rates of radioactive material transport packages. Taking China as an example, (GB11806-2019) is a national mandatory standard specially formulated in accordance with relevant national laws and regulations to prevent radioactive pollution, improve environmental quality, and regulate the management of radioactive materials transportation. The safety requirements for the transport of radioactive materials under normal transport conditions and transport accident conditions, in which the dose rates on the outer surface of the radioactive material package and at 1m are clearly specified. In practical work, it is often necessary to evaluate the surface of the package at different positions and the dose rate at 1m to ensure transportation safety. Based on several radioactive material transport containers with mature experience, this paper calculates the external radiation levels of various shapes of packages by using mathematical methods, and classifies them according to the geometric characteristics of the containers and the distribution of the contents. The influence of the surface of the location and the variation law of the dose rate at 1m is analyzed to provide a reference for the radiation safety management of radioactive material transportation activities.