NEUTRON CALIBRATION FIELD OF (_^239)Pu-Be SOURCE: DOSIMETRIC QUANTITIES OF THE TOTAL COMPONENT
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(_^239)PuBe source; Dosimetric quantities; Ambient dose; Fluence; Total component.Abstract
This paper presents the determination of the dosimetric parameters of the total component in the neutron calibration field using a source established at the Military Institute of Chemical and Environmental Engineering, MICEE (belonging to the High Command of Chemistry – Ministry of National Defense). The dosimetric parameters of the total component are evaluated through measurements using the Bonner sphere spectrometer (BSS) and the international commercial neutron unfolding code (FRUIT). Specifically, the following quantities are measured and calculated: total neutron fluence rates, total neutron ambient dose rates, neutron fluence-averaged energies, neutron ambient dose-averaged energies, neutron fluence-to-ambient dose conversion coefficients. The experimental results show that the neutron calibration field of (at MICEE) can be used to calibrate the neutron ambient dose rate meters within the range < 50 µSv/h.
References
[1]. Bedogni, R., Bortot, D., Buonomo, B., Esposito, A., Gömez-Ros, J.M., Introini, M.V., Mazzitelli, G., Moraleda, M., Pola, A., Romero, A.M; “A single-exposure, multidetector neutron spectrometer for workplace monitoring”; Radiation Protection and Dosimetry Vol.170, 326–330 (2016).
[2]. Bedogni, R., Domingo, C., Roberts, N., Thomas, D.J., Chiti, M., Esposito, A., Garcia, M.J., Gentile, A., Liu, Z.Z., De-San-Pedro, M; “Investigation of the neutron spectrum of Americium–Beryllium sources by Bonner sphere spectrometry”; Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol.763, 547–562 (2014).
[3]. Vega-Carrillo, H.R., Gallego, E., Lorente, A., Isabel, P.R., Méndez, R; “Neutron features at the UPM neutronics hall”; Applied Radiation and Isotopes, Vol.70, 1603–1607 (2012).
[4]. Park, H., Kim, J., Choi, K.O; “Neutron calibration facility with radioactive neutron sources at KRISS”. Radiation Protection and Dosimetry, Vol.126, 159-162 (2007).
[5]. Liamsuwan, T., Channuie, J., Wonglee, S., Kowatari, M., Nishino, S; “Characterization of an in-house developed multi-cylindrical moderator’s neutron spectrometer”; Radiation Protection and Dosimetry, Vol.180 (1-4), 94-97 (2018)
[6]. Thomas, D.J., Alevra, A.V; “Bonner sphere spectrometers -- Critical review”; Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol.476,12-20 (2002).
[7]. Le, T.N, Tran, H.N., Nguyen, K.T., Trinh, G.V.; “Neutron calibration field of a bare (_^252)Cf source in Vietnam”; Nuclear Engineering and Technology, Vol.49, 277–284 (2017).
[8]. Le, T.N, Tran, H.N., Nguyen, Q.N., Trinh, G.V., Nguyen, K.T.; “Characterization of a neutron calibration field with (_^241)Am-Be source using Bonner sphere spectrometers”; Applied Radiation and Isotopes, Vol.133, 68–74 (2018).
[9]. Le, T.N, Hoang, S.M.T., Nguyen, Q.N., Thiansin L., Tran, H.N., “Simulated workplace neutron fields of (_^241)Am-Be source moderated by polyethylene spheres”; Journal of Radioanalytical and Nuclear Chemistry; Vol.321, 313–321 (2019).
[10]. Le, T.N,; “Establishment of Neutron Reference Fields in Vietnam: A Review”; Philippine Journal of Science; Vol.149 (3-a), 947-954 (2020).
[11]. Cruzate, J.A., Carelli, J., Gregori, B.; “Bonner sphere spectrometer”, In: Workshop on Uncertainty Assessment in Computational Dosimetry: a Comparison of Approaches. Bologna, Italia, 8–10 October (2007).
[12]. Bedogni, R., C. Domingo, A. Esposito, and F. Fernéndez; “FRUIT: An operational tool for multisphere neutron spectrometry in workplaces”; Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol.580 (3), 1301–1309 (2007).
[13]. C.J. Werner (ed.), MCNP User’s Manual, Code Version 6.2 (Los Alamos National Laboratory, USA (2017)
[14]. IAEA Technical Reports Series No.403; “Compendium of neutron spectra and detector responses for radiation protection purposes – Supplement to technical reports series No. 318”; International Atomic Energy Agency, Technical Report 403 (2001).
[15]. ISO 8529-1:2001 (E); “Reference neutron radiations – Part 1: Characteristics and methods of production”; International Standard Organization, Technical Report (2001).
[16]. ICRP Publication 116; “Conversion Coefficients for Radiological Protection for External Radiation Exposures”; Annal of ICRP 40 (2–5) (2010).
