Study On Optimizing Design For The Shielding Of Low Energy Electron Irradiation Accelerator And It’s Dose Distribution

Irradiation industry is developing and growing constantly as a rising star with the science and technology continuous improvement and the field it referred is becoming more and more abroad. Radiation is never the proper noun in the field of nuclear energy or nuclear medical technology from the Co-60gama-irradiation initiatory to the operation of electron irradiation accelerator, from irradiation breeding or sterilization and disinfection to material modification or cable irradiation. Radiation protection is an important requirement of safety in irradiation industry. The source item is clear and definite for the Co-60gama-irradiation, but, for the linear accelerator of irradiation the source item is uncertain and the protection is complex. It is a problem to optimize radiation shield of accelerator. To design an economic and effective shielding method in order to accord with the three principle of radiation protection is very meaningful.The radiation dose rates at the different maze exits of a10MeV industrial electron linear accelerator are compared by formula and Monte carlo method in this paper. A real-time measurement system composed with Mini Digital Data Logging (Mini-DDL) and Gamma detectors is also used in this work. The results indicate that the dose rates would reduce one order of magnitudes if the maze door add a corner and another scattering. All of this do not increase any additional cost and conform to the ALARA(as low as reasonably achievable) principle. It provides a good reference for the later design of shielding for industrial electron linear accelerator.The paper has also did some research on X-ray emission from different Z targets, using MCNP code. The idea was raised by some report that different Z target will have different X-ray emission. We also did some real time measurement on different targets. The conclusion that high Z target will have a high X-ray emission is in line with the empirical equation. It recommend some correction factor of some common matters compared with high Z targets and it is conservative.For the neutron dose rate of the accelerator in the maze, it has done some research on it. But the result is not reliable. Even though it can not provide reference, the date we got can point out the direction for future study.We expect the investigation and the suggestion about the radiation shielding we did be meaningful on the designing and shielding of the similar accelerator and the question which is not solved in this paper can be figure out in the near future. The study will give ome reference for related works and make a contribution to the accelerator industry.