Radiation Safety Assessment of the New Neutron Radiography System at Tehran Research Reactor

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Abstract

Recently, a new Neutron Radiography (NR) beam line has been designed, constricted, installed and tested based on the use of E-beam tube of Tehran Research Reactor (TRR). Initial tests have been shown that the system can be used for different samples and purposes such as nuclear plates and rods fuels.  For this end the system need a suitable irradiation room which should be installed at the NR beam port. The present work is the analyses of the proposed irradiation room in view of irradiation safety. To do this, using MCNPX Monte Carlo code the proposed room structure and neutron beam catcher have been simulated and then neutron/gamma dose have been calculated at different locations around the room walls. The results show that the designed room and beam catcher have good performance in case of reduce the total neutron and gamma dose to 10 μSv/h which is desired value in view of radiation protection issue.
 

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References

[1] Dastjerdi, MH Choopan, et al. "Design, construction and characterization of a new neutron beam for neutron radiography at the Tehran Research Reactor." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 818 (2016): 1-8. [2] Dastjerdi, Mohammad Hossein Choopan, and Hossein Khalafi. "Design of a thermal neutron beam for a new neutron imaging facility at Tehran research reactor." Physics procedia 69 (2015): 92-95. [3] Dastjerdi, MH Choopan, et al. "The quality assessment of radial and tangential neutron radiography beamlines of TRR." Journal of Instrumentation 12.07 (2017): P07008. [4] Dastjerdi, Mohammad Hosein Choopan, et al. "Inspection of domestic nuclear fuel rods using neutron radiography at the Tehran Research Reactor." Materials Testing 58.9 (2016): 763-766. [5] Waters, Laurie S. "MCNPX user’s manual." Los Alamos National Laboratory (2002). [6] Grande, P., and M. C. O’Riordan. "ICRP committee 3 task group. Data for protection against ionizing radiation from external sources (ICRP-21)." (1971).

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