Estimation of scattered radiation influence on neutron beams at a calibration laboratory using Monte Carlo simulation of a long counter
DOI:
https://doi.org/10.15392/2319-0612.2023.2249Keywords:
Long counter, Scattered radiation, Monte Carlo simulationAbstract
At the Neutron Calibration Laboratory (LCN) of IPEN/CNEN, a 241AmBe source was used to test and calibrate neutron detectors. The neutrons emitted by the source reach the detector as intended, but they also scatter undesirably from the building's floor, ceiling, and walls, leading to indirect detection. A Long Counter (LC) detector was modeled using the MCNPX Monte Carlo code. The objective of this study was to measure the contribution of scattered radiation at the LCN / IPEN, and to determine the fluence rate, at different points in the calibration room at source-to-detector distances of 100 cm and 150 cm; subsequently, the results were compared with those of the Brazilian Laboratory of Metrology of Ionizing Radiation (LNMRI). The results show that the fluence rates of LCN / IPEN are comparable to those of this neutron laboratory for the 100 and 150 cm source-to-detector distances using a 241AmBe source (37 GBq). The results show that the calibration of neutron detectors should be performed at distances less than 100 cm, where the contribution of scattered radiation is within the 40% limit recommended by ISO 8529-1.
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References
SCHUHMACHER, H. Neutron calibration facility. Radiat. Prot. Dosim. v.110, p.33-42, 2004.
LE, T.N. ; TRAN, H.N. ; DUONG, T.D. ; NGUYEN, Q.N. ; HO, T.Q. ; TRINH, G.V. ; NGUYEN, K.T. Evaluation of gamma contribution in a neutron calibration field of 241AmBe source. Appl. Radiat. Isot. v. 133, p. 117-120, 2018.
LEE, S.K. ; KIM, S.I. ; LEE, J. ; CHANG, I. ; KIM, J.L. ; KIM, H. ; KIM, M.C. ; KIM, B.H. Evaluation of neutron scattering correction using the Semi-Empirical Method and the Shadow-Cone Method for the neutron field of the Korea Atomic Energy Research Institute. Radiat. Prot. Dosim. v. 180 (1-4), p. 46-50, 2018.
PORRAS, I.; PRAENA, J.; ARIAS DE SAAVEDRA, F.; PEDROSA-RIVERA, M.; TORRES SÁNCHEZ, P.; SABARIEGO, M.P.; EXPÓSITO-HERNÁNDEZ, J.; LLAMAS-ELVIRA, J.M.; RAMÍREZ-NAVARRO, A.; RODRÍGUEZ-FERNÁNDEZ, A.; OSORIO-CEBALLOS, J.M.; RUIZ, C.; RUIZ-MAGAÑA, M.J. BNCT research activities at the Granada group and the project NeMeSis: Neutrons for medicine and sciences, towards an accelerator-based facility for new BNCT therapies, medical isotope production and other scientific neutron applications. Appl. Radiat. Isot. v. 165, p. 109247, 2020.
ALVARENGA, T. S.; FEDERICO, C. A. ; CALDAS, L. V. E. Determination of radiation spread in the IPEN Neutron Calibration Laboratory. Braz. J. Radiat. Sci. v. 5, p. 1-10, 2017.
HWAN, B.K. ; LYUL, J.K. ; YOUNG, S.C., CHO, G. Scattered neutron calibration fields of KAERI. J. NucL. Sci. Technol. v. 37, p. 781-784, 2014.
VEGA-CARRILLO, H. R. ; MANZANARES-ACUÑA, E. ; IÑIGUEZ, M. P. ; GALLEGO, E. ; LORENTE, A. Study of room-return neutrons. Radiat. Meas. v. 42 (3), p. 413–418, 2007.
POLA, A. ; BEDOGNI, R. ; DOMINGO, C. ; BORTOT, D. ; GOMEZ-ROS, M. J. ; INTROINI, M. V. ; MARTINEZ-ROVIRAC, I. ; ROMERO-EXPOSITO, M. ; COSTA, M. Neutron spectrometry of a lightly encapsulated 241Americium–Beryllium neutron source using two different Bonner Sphere Spectrometers. Nucl. Instrum. Meth. Phys. Res. Sect. A. v. 927,
p. 371-374, 2019.
GRESSIER, V. Review of neutron calibration facilities and monitoring techniques: new needs for emerging fields. Radiat. Prot. Dosim. v. 161(1-4), p. 27-36, 2014.
DAWN, S. ; BAKSHI, A. K. ; SATHIAN, D. ; SELVAM, T. P. Estimation of neutron scatter correction for calibration of personnel dosimeter and dose ratemeter against 241Am-Be source - Monte Carlo simulation and measurements. Radiat. Prot. Dosim. v. 175(2), p. 149-162, 2016.
ISO, INTERNATIONAL ORGANIZATION FOR STANDARDIZATION. Reference Neutron Radiations. Characteristics and Methods of Production. Technical Report
ISO 8529- 2, Geneva, 2000.
THIEM, N. L. ; HOAI-NAM, T. ; KHAI, T. N. ; GIAP, V. T. Neutron calibration field of a bare 252Cf source in Vietnam. Nucl. Eng.Techn. v. 49, p. 227-284, 2017.
ANTANACKOVIC, T.; YONKEU, A.; DUBEAU, J.; WITHARANA, H, S.; PRIEST, N. Characterization of neutron fields from bare and heavy water moderated 252Cf spontaneous fis-sion source using Bonner sphere spectrometer. Appl. Radiat. Isot. v. 99, p. 122-132, 2015.
THOMAS, D. J.; NOLTE, R.; GRESSIER, V. What is neutron metrology and why is it needed? Metrologia. v. 48, p. 225–238, 2011.
SLAUGHTER, D. An operating Manual for the de Pangher Precision Long Couter, Lawrence Livermore Laboratory, University of California, 1978.
FERNANDES, S.S.; ASTUTO, A.; PATRÃO, K.C.S.; FONSECA, E.S.; PEREIRA,W.W.; LOPES, R.T. Long counter and its application for the calibration of the neutron irradiators. Radiat. Prot. Dosim. v. 180 (1-4), p. 37–41, 2018.
TAGZIRIA, H.; THOMAS, D. J. Calibration and Monte Carlo modelling of neutron long counters. Nucl. Instrum. Meth. Phys. Res. Sect. A. v. 452, p. 470–483, 2000.
McCONN JR, R. J.; GESH, C. J.; PAGH, R. T.; RUCKER, R.A.; WILLIAMS III, R. G. Radiation portal monitor project. Compendium of material composition data for radiation transport modeling. PNNL-15870, Rev. 1 Pacific Northwest National Laboratory, 2011.
KHABAZ, R.; HAKIMABAD, M, H. Determination of 241Am-Be spectra using Bonner Sphere Spectrometer by applying shadow cone technique in calibration. J. Appl. Sci, v. 11,
p. 2849-2854, 2011.
ISO - INTERNATIONAL ORGANIZATION FOR STANDARDIZATION. Reference Neutron Radiations - Part 1: Characteristics and Methods of Production. Technical Report 8529-1:2001 (E), Geneva, 2001.
ROBERTS, N. J. International key comparison of measurements of neutron source emission rate (1999–2005): CCRI(III)-K9.AmBe. Metrologia, v. 48(S 251 Tech. Suppl.), p. 06018, 2011.
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