Determination of the detection efficiency of in thiroid using Monte Carlo method
Main Article Content
Abstract
Monte Carlo Method was the base to estimate the detection efficiency of of the identiFINDER ultra detector in “thyroid” geometry. The suitability of the calibration methodology is discussed using a comparison of the results of the Direct Monte Carlo Method and the Transfer Monte Carlo Method calculations with the values of experimentally calculated efficiency. Transfer Monte Carlo Method was the elected methodology because of the differences with the real detection efficiency stay below 10 %. In the simulations, the geometric parameters of the detector were found using a tomography study. The arrangement detector – point source was simulated to obtain the correction factors for preset distances, and the arrangement detector – thyroid phantom was simulated to obtain the detection efficiency curve in function of the distance for .
In order to validate the proposed methodology the Internal Dosimetry Laboratory of the Centre for Radiation Protection and Hygiene participated in a regional intercomparison exercise of measured activity estimation in thyroid, for the estimation were used the traditional calculation methodology as well as the methodology base on Monte Carlo Method, the results were satisfactory in both cases. As a final result, the curves of detection efficiency for the measurement of in the thyroid gland was obtained without using physical phantoms, replacing the current lack of it.
In order to validate the proposed methodology the Internal Dosimetry Laboratory of the Centre for Radiation Protection and Hygiene participated in a regional intercomparison exercise of measured activity estimation in thyroid, for the estimation were used the traditional calculation methodology as well as the methodology base on Monte Carlo Method, the results were satisfactory in both cases. As a final result, the curves of detection efficiency for the measurement of in the thyroid gland was obtained without using physical phantoms, replacing the current lack of it.
Article Details
How to Cite
Ramos Machado, D., Yera Simanca, Y., López Bejerano, G. M., & Acosta Rodríguez, N. (1). Determination of the detection efficiency of in thiroid using Monte Carlo method. Nucleus, (59). Retrieved from http://nucleus.cubaenergia.cu/index.php/nucleus/article/view/623
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Ciencias Nucleares
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References
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[3] KRAMER G. Measurement of the quantity ‘activity’ of radionuclides in simulated human
organs: an international intercomparison. Vienna: IAEA, 2006.
[4] GOMEZ-ROS JM, de CARLAN L, FRANCK D, et. al. Monte Carlo modeling for in vivo measurements of americium in aknee voxel phantom: general criteria for an international comparison. Radiat Prot Dosim. 2007; 127(1-4): 245-248.
[5] GOMES-ROS J, HUNT J, et. al. Monte Carlo modeling of Germanium detectors for the measurement of low energy photons in internal dosimetry: results of an international comparison. Radiation Measurements. 2008, 43(2-6): 510- 515.
[6] MCNP: A General Monte Carlo N-Particle Transport Code. Version 5. Vol I. X-5. Monte Carlo Team. 2003.
[7] McCONN RJ, GESH CJ, PAGH RT, et. al. Compendium of material composition data for radiation transport modeling. Radiation Portal Monitor Project. PNNL-15870 Rev. 1. US Department of Homeland Security, 2011.
[8] LIYE L, JIZENG M, FRANCK D, de CARLAN L, BINQUAN Z. Monte Carlo efficiency transfer method for full energy peak efficiency calibration of three type HPGe detectors: a coaxial N-type, A coaxial P-type and four BEGe detectors. Nucl Instrum Meth in Phys Res A. 2006; 564(1): 608-613.
[9] LEPY MC. Intercomparison of efficiency transfer software for gamma-ray spectrometry. Appl. Radiat. Isot. 2001; 55(4): 493-503.
[10] YERA Y, RAMOS D, LÓPEZ GM, ACOSTA N. Desempeño del LDI en la intercomparación regional de dosimetría interna. X Congreso Regional Latinoamericano IRPA de Protección y Seguridad Radiológica. 12 al 17 de abril, 2015. Buenos Aires, Argentina.