Estimation of scattering contribution in the calibration of neutron devices with radionuclide sources in rooms of different sizes

Calibrations of neutron devices used in area monitoring are often performed by radionuclide neutron sources. Device readings increase due to neutrons scattered by the surroundings and the air. The influence of said scattering effects have been investigated in this paper by performing Monte...

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Main Author: Khabaz Rahim
Format: Article
Language:English
Published: VINCA Institute of Nuclear Sciences 2015-01-01
Series:Nuclear Technology and Radiation Protection
Subjects:
Online Access:http://www.doiserbia.nb.rs/img/doi/1451-3994/2015/1451-39941501047K.pdf
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author Khabaz Rahim
author_facet Khabaz Rahim
author_sort Khabaz Rahim
collection DOAJ
description Calibrations of neutron devices used in area monitoring are often performed by radionuclide neutron sources. Device readings increase due to neutrons scattered by the surroundings and the air. The influence of said scattering effects have been investigated in this paper by performing Monte Carlo simulations for ten different radionuclide neutron sources inside several sizes of concrete wall spherical rooms (Rsp = 200 to 1500 cm). In order to obtain the parameters that relate the additional contribution from scattered neutrons, calculations using a polynomial fit model were evaluated. Obtained results show that the contribution of scattering is roughly independent of the geometric shape of the calibration room. The parameter that relates the room-return scattering has been fitted in terms of the spherical room radius, so as to reasonably accurately estimate the scattering value for each radionuclide neutron source in any geometry of the calibration room.
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spelling doaj.art-a5dc39a3707b408fbddfe18737d6ae5d2022-12-21T18:48:38ZengVINCA Institute of Nuclear SciencesNuclear Technology and Radiation Protection1451-39942015-01-01301475410.2298/NTRP1501047K1451-39941501047KEstimation of scattering contribution in the calibration of neutron devices with radionuclide sources in rooms of different sizesKhabaz Rahim0Golestan University, Faculty of Sciences, Physics Department, Gorgan, IranCalibrations of neutron devices used in area monitoring are often performed by radionuclide neutron sources. Device readings increase due to neutrons scattered by the surroundings and the air. The influence of said scattering effects have been investigated in this paper by performing Monte Carlo simulations for ten different radionuclide neutron sources inside several sizes of concrete wall spherical rooms (Rsp = 200 to 1500 cm). In order to obtain the parameters that relate the additional contribution from scattered neutrons, calculations using a polynomial fit model were evaluated. Obtained results show that the contribution of scattering is roughly independent of the geometric shape of the calibration room. The parameter that relates the room-return scattering has been fitted in terms of the spherical room radius, so as to reasonably accurately estimate the scattering value for each radionuclide neutron source in any geometry of the calibration room.http://www.doiserbia.nb.rs/img/doi/1451-3994/2015/1451-39941501047K.pdfneutroncalibrationscattering contributionradionuclide sourceMCNPX
spellingShingle Khabaz Rahim
Estimation of scattering contribution in the calibration of neutron devices with radionuclide sources in rooms of different sizes
Nuclear Technology and Radiation Protection
neutron
calibration
scattering contribution
radionuclide source
MCNPX
title Estimation of scattering contribution in the calibration of neutron devices with radionuclide sources in rooms of different sizes
title_full Estimation of scattering contribution in the calibration of neutron devices with radionuclide sources in rooms of different sizes
title_fullStr Estimation of scattering contribution in the calibration of neutron devices with radionuclide sources in rooms of different sizes
title_full_unstemmed Estimation of scattering contribution in the calibration of neutron devices with radionuclide sources in rooms of different sizes
title_short Estimation of scattering contribution in the calibration of neutron devices with radionuclide sources in rooms of different sizes
title_sort estimation of scattering contribution in the calibration of neutron devices with radionuclide sources in rooms of different sizes
topic neutron
calibration
scattering contribution
radionuclide source
MCNPX
url http://www.doiserbia.nb.rs/img/doi/1451-3994/2015/1451-39941501047K.pdf
work_keys_str_mv AT khabazrahim estimationofscatteringcontributioninthecalibrationofneutrondeviceswithradionuclidesourcesinroomsofdifferentsizes