Characterization of neutron fields from bare and heavy water moderated (252)Cf spontaneous fission source using Bonner Sphere Spectrometer

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine
J AtanackovicNicholas Priest

Abstract

In this work a calibrated Bonner Sphere Spectrometer (BSS), together with ISO shadow cones, was used to quantify the total and scattered components of bare and heavy water moderated (252)Cf neutron fields. All measurements were performed with a BSS that was calibrated at the National Physical Laboratory (NPL), Teddington, UK, which is a global primary standard laboratory and world-leading facility for neutron metrology and neutron instruments calibration. The fields were characterized for source-spectrometer distances of 80, 100, 150 and 200cm; and at heights of 103 and 200cm from the facility floor. As expected, the scattered contribution was greatest at the farthest distance from the source and closer to the floor. Hence, at a distance of 200cm and a height of 103cm, the scatter added to the direct field up to 162% of the total neutron fluence and up to 61% of the ambient dose equivalent, while at the same distance and height of 200cm above the floor, these values were up to 146% and 52%, respectively. In the case of heavy water moderated (252)Cf neutron fields, a shadow cone subtraction technique could not be implemented, however Monte Carlo simulations were utilized in order to differentiate between the direct and scatter c...Continue Reading

References

Feb 6, 2004·Radiation Protection Dosimetry·A V Alevra, D J Thomas
May 15, 2007·Radiation Protection Dosimetry·R H OlsherR T Devine
Sep 13, 2007·Radiation Protection Dosimetry·G C TaylorA Bennett
Oct 4, 2011·Radiation Protection Dosimetry·J DubeauJ P Archambault
Mar 19, 2014·Radiation Protection Dosimetry·M Luszik-BhadraR Seifert

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Citations

May 21, 2016·Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine·H MazrouT Seguini

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