MEASUREMENT OF THE MAIN CHARACTERISTICS OF PuBe AND 238PuBe NEUTRON SOURCES USING BONNER SPHERE SPECTROMETER WITH A 3He-COUNTER
Keywords:
NEMUS spectrometer on Bonner spheres, 3He neutron counter, shadow cone, neutron radiation spectrum, Bayes theorem, response function, likelihood function, MAXED method, maximum entropy and deconvolution method, Shannon entropy, Lagrange multiplier method,
Abstract
The energy and pulse height spectrum of PuBe and 238PuBe neutron sources are measured without taking into account scattered radiation, taking into account this radiation (without the shadow cone) and own scattered radiation from these sources (with a shadow cone) using a NEMUS spectrometer on Bonner spheres with 3He -counter. An analytical solution of the likelihood function equation is given, taking into account the fact that the counting rate of pulses obeys the chi-square distribution used to estimate the variances, the discrete Poisson distribution, and the normal distribution, using the Bayes theorem and the Lagrange multiplier method. The values of the main characteristics of neutron radiation are measured: neutron flux density, ambient dose rate equivalent, individual dose rate equivalent and average neutron radiation energy. Extensive uncertainties were obtained in the measurement of these characteristics with a confidence level of 0.95. Calculation of energy spectrum, basic characteristics of neutron radiation and extended uncertainties is performed by the MAXED (maximum entropy and deconvolution) method using the UMG_3.3 software.Downloads
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References
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2. Wiegel B., Alevra A.V. NEMUS – the PTB Neutron Multisphere Spectrometer: Bonner sphere and more // Nuclear Instruments and Method in Physics Research. Section A. – 2002. – Vol. 476. – P. 36-41.
3. Alevra A.V., Thomas D.J. Neutron spectrometry in mixed fields: multisphere spectrometers // Radiation Protection Dosimetry. – 2003. – Vol. 107. – No. 1 – 3. – P. 37-72.
4. Cruzate, J.A., Carelli, J.L., Gregori, B.N. Bonner Sphere Spectrometer / Proceedings of Workshop on «Uncertainty Assessment in Computational Dosimetry: a Comparison of Approaches». – Bologna. – 2007. – P. 45-52.
5. Reginatto M., Goldhagen P. MAXED, A computer code for maximum entropy deconvolution of multisphere neutron spectrometer data // Health Physics. – 1999. – Vol. 77. – No. 5. – P. 579-583.
6. Reginatto M., Goldhagen P., Neumann S. Spectrum unfolding, sensitivity analysis and propagation of uncertainties with the maximum entropy deconvolution code MAXED // Nuclear Instruments and Method in Physics Research. Section A. – 2002. – Vol. 476. – P. 242-246.
7. Reginatto M. Unfolding techniques for neutron spectrometry / Preprint (24.01.2008). Submitted to the Proceedings of Workshop on «Uncertainty Assessment in Computational Dosimetry: a Comparison of Approaches». – Bologna. – 2007. – 8 p.
8. Reginatto M. What can we learn about the spectrum of high-energy stray neutron fields from Bonner sphere measurements? // Radiation Measurements. – 2009. – Vol. 44. – P. 692-699.
9. Vega-Carrillo H.R., Torres-Muhech C. Low energy neutrons from a 239PuBe isotopic neutron source inserted inmoderating media // Revista Mexicana de Fisica. – 2002. – Vol. 48. – No. 5. – P. 405-412.
10. Dann C. Ward. Impact of Switching To The ICRP-74 Neutron Flux-To-Dose Equivalent Rate Conversion Factors At The Sandia National Laboratory Building 818 Neutron Source Range / SANDIA REPORT. SAND2009-1144. – Albuquerque, New Mexico 87185 and Livermore, California 94550. – 2009. – 52 p.
11. Vega-Carrillo H.R., Hernandez-Davila V.M., Rivera-Montalvo T., Sanchez A. Characterization of a 239PuBe Isotopic Neutron Source / Proccedings of the XIII International Symposium XXIII National Congress on Solid State Dosimetry. – Mexico. – 2012. – P. 64-69.
12. Manual Bonner Sphere Spectrometer of the National Scientific Centre «Institute of Metrology». – Braunschweig. – 2010. – 26 p.
13. WebMATE. User Manual. ICx Technologies GmbH. WebMATE/en/1.4(3967). – Solingen. – 2009. – 16 p.
14. WinTMCA32. User Manua. ICx Technologies GmbH. WebMATE/en/1.2(3366). – Solingen. – 2009. – 134 p.
15. Reginatto M., Wiegel B., Zimbal A., UMG 3.3 – Unfolding with MAXED and GRAVEL, available from the NEA Data Bank // http://www.oecd-nea.org/tools/abstract/detail/nea-1665, https://rsicc.ornl.gov/codes/psr/psr5/psr-529.html.
16. Reginatto M. The «few-channel» unfolding programs in the UMG package: MXD_FC33, GRV_FC33 and IQU_FC33. UMG package, version 3.3. PTB. – Braunschweig. – 2004. – 51 p.
17. ISO 8529-1:2001. Reference neutron radiations. Part 1. Characteristics and methods of production. – Geneva. – 2001. – 24 p.
18. ISO 8529-2:2000. Reference neutron radiations. Part 2. Calibration fundamentals of radiation protection devices related to the basic quantities characterizing the radiation field. – Geneva. – 2000. – 31 p.
19. Khabaz R., Hakimabad H.M. Determination of 241Am-Be Spectra using Bonner Sphere Spectrometer by Applying Shadow Cone Technique in Calibration // Journal of Applied Sciences. – 2011. – Vol. 11. – No. 15. – P. 2849-2854.
20. Wiegel B., Alevra A.V., Siebert B.R.L. Calculations of the Response Functions of Bonner Spheres with a Spherical 3He Proportional Counter. Using a Realistic Detector Model / PTB-Bericht N-21. – Braunschweig. – 1994. – 84 p.
21. Compendium of Neutron Spectra and Detector Responses for Radiation Protection Purposes. Supplement to Technical Reports Series No. 318 / Technical Reports Series No. 403. IAEA. – Vienna. – 2001. – 337 p.
22. Reginatto M., Goldhagen P. MAXED. A computer code for the deconvolution of multisphere neutron spectrometer data using the maximum entropy method // Environmental Measurements Laboratory. EML-595. U.S. Department of Energy. – New York. – 1998. – 40 p.
23. Ivanskyi V.B., Letuchyi A.N., Orobinskyi А.N., Siroko H.V. Researches of the spectrum of PuBe and 238PuBe neutron sources using Bonner sphere spectrometer with a 3He-counter // Proceedings of the International scientific-technical conference «METROLOGY-2017». – Minsk. – 2017. – P. 136 – 141 (in Russian).
Published
2017-08-01
Cited
How to Cite
Ivanskyi, V. B., Letuchyy, O. N., OrobinskyiА. N., & Siroko, H. V. (2017). MEASUREMENT OF THE MAIN CHARACTERISTICS OF PuBe AND 238PuBe NEUTRON SOURCES USING BONNER SPHERE SPECTROMETER WITH A 3He-COUNTER. East European Journal of Physics, 4(2), 53-65. https://doi.org/10.26565/2312-4334-2017-2-07
Section
Original Papers
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