Abstract
Objective of this study is measuring the macroscopic cross section of a neutron absorbing layer for thermal neutrons. For this purpose a neutron source and BF 3 detector have been applied. For measuring macroscopic cross section of thermal neutrons by the \( I = BI_{0} e^{{ - \sum\nolimits_{tot} t}} \) Formula, it is necessary to provide suitable geometric conditions in order to assume the production and build-up coefficient to be the unit value (=1). To fulfill required conditions for this assumption, surface of the detector is covered with a 2 mm thick layer of cadmium. Radiation window of the detector has a 3 cm diameter, situated directly in front of the source. By placing the cadmium cover over the detector, variation of \( Ln{\frac{{I_{0}^{{}} }}{I}} \) values verses thickness of absorbent layer, renders linear function behavior, making it possible to measure the macroscopic cross section. The next stage is applying the MCNP code by simulating F1 tally and cosine-cards for calculating Total Macroscopic Cross-Section. Validation of this study is achieved through comparison of simulation by the MCNP code and results rendered by experiment measurements.
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References
G.F. Knoll, Radiation detection and measurement, 3rd edn. (John Wiley & Sons, NJ, 1999), p. 802
A.B. Chilton, J.K. Shultis, R.E. Faw, Principle of radiation shielding (Printice-Hall, Englewood Cliffis, NJ, USA, 1984)
J.R. Lamarsh, A.J. Baratta, Introduction to nuclear engineering (Prentic Hall, Englewood Cliffis, NJ, USA, 1975)
J.A. Czubek, Advances in absolute determination of rock matrix absorption cross thermal neutrons. Nuclear Geophysics, section four (1991)
J. Halperin et al. Thermal Neutron Cross Section and Resonance Integral of Sm-150. Transact Amer Nucl Soc (US), 5 (1962)
F.J. Johnston, J. Halperin, R.W. Stoughtonm, The thermal neutron absorption cross-section of 233 Th and the resonance integrals of 232 Th, 233 Th and 59 Co. J Nucl Energy, part A: Rea Sci. 95–100 (1960)
K.H. Beckurts, K. Wirtz, Neutron physics (Springer, Berlin, 1964), p. 444
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Kiyani, A., Rostam, G.G., Sadat Kiai, S.M. et al. Measurements of the Thermal Neutron Macroscopic Absorption Cross Section for Neutron Absorbing Layers. J Fusion Energ 30, 473–476 (2011). https://doi.org/10.1007/s10894-011-9400-9
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DOI: https://doi.org/10.1007/s10894-011-9400-9