tailieunhanh - Báo cáo nghiên cứu khoa học: "Monte carlo simulation by code of MCNP and experimental check for measuring thickness of materials for the specializing system of MYO-101"

Tại hiện đo độ dày, vật liệu dựa trên tác động của tia gamma tán xạ ngược đã được sử dụng rộng rãi trong ngành công nghiệp ở nước ta. | VNU Journal of Science Mathematics - Physics 26 2010 43-49 Monte carlo simulation by code of MCNP and experimental check for measuring thickness of materials for the specializing system of MYO-101 Bui Van Loat1 Nguyen Van Hung2 Hoang Sy Minh Phuong2 1 Hanoi Umiversity of Science 334 Nguyen Trai Thanh Xuan Hanoi 2Nuclear Research Institute N01 Nguyen Tu Luc Dalat Received 15 December 2009 Abstract. At present thickness measurement of materials based on effect of backscattering gamma-ray has been widely used in industry in our country. The report presented research in measuring thickness of some materials such as paper plastic aluminum and steel with using the dedicated system of MYO-101 having scintillation detector of YAP Ce and gamma-ray of 60 keV of Am-241 source by Monte-Carlo simulation using the code of MCNP. The simulation was checked by experimental measurements. The results were shown that they were in accordance with the range of error. This research has been useful for training activities with a view of human resources development in the field of application of nuclear technique in industry in Vietnam. Keywords Monte-Carlo simulation Monte Carlo N-Particle Backscattering gamma Scintillation detector Nuclear technique. 1. Introduction At present gamma backscattering method is applied in industry to measure the thickness of light materials such as in the paper with the use of dedicated measuring systems using beta or low-energy gamma radioactive sources. The advantage of this method is to measure the thickness from only one side of the material. Radioactive source and detector are from the same side and it is favorable in industrial conveyor systems preferably with light materials but the low efficiency 1 . Therefore in order to support and compare them with experimental results research method of Monte Carlo simulation by code of MCNP Monte Carlo N-Particles for thickness measurement based on the effect of backscattering gamma-ray is applied in this report