NaI(Tl) Scintillator's Response Functions for Point-like and Distributed Gamma-ray Sources
Keywords:Gamma- ray, Point-like source, Distributed source, NaI(Tl) response, Monte Carlo
The response functions of a NaI(Tl) detectors have been estimated using Monte Carlo methods. Response functions were calculated for monoenergetic photon sources (0.05 to 3 MeV). Responses were calculated for point-like sources and for sources distributed in Portland cement cylinders. Calculated responses were used to estimate the detector efficiency for point-like and distributed sources. Samples of cylindrical Portland cement were prepared and exposed to the photoneutron field produced by a 15 MV linac used for radiotherapy. Short half-life radioisotopes were induced and the activity was determined by measuring the pulse-height spectra with a NaI(Tl) g-ray spectrometer that was calibrated using point-like sources. Instead of doing corrections due to differences between the geometry, material and solid angle of point-like sources used for calibration, and the Portland cement cylinders, the detection efficiency was determined using the ratio between the efficiencies for the point-like and the distributed sources estimated with the Monte Carlo calculations, and the activity of the induced isotopes in cement was obtained.
Benites-Rengifo, J. L. Spectra and neutron doses produced in a Varian iX linear accelerator, Ph.D. thesis (in Spanish), Universidad Autonoma de Nayarit, (2013).
Benites-Rengifo, J. L., Vega-Carrillo, H. R. & Velazquez-Fernandez, J. Photoneutron spectrum measured with a Bonner sphere spectrometer in planetary method mode. Applied Radiation and Isotopes 83(Part C), 256–259 (2014). http://dx.doi.org/10.1016/j.apradiso.2013.04.001
Conway, J.T. Geometric efficiency for a parallel-surface a detector system with at least one axisymmetric surface. Nuclear Instruments and Methods in Physics Research A, 583(2-3), 382–393 (2005). http://dx.doi.org/10.1016/j.nima.2007.09.051
Do-Kun, Y., Joo-Young, J., Seong-Min, H. & Tae Suk, S. Statistical analysis for discrimination of prompt gamma ray peak induced by high energy neutron: Monte Carlo simulation study. Journal of Radioanalytical and Nuclear Chemistry, 303(1), 859 – 866 (2015). http://dx.doi.org/10.1007/s10967-014-3572-5
Gilmore, G. Practical Gamma-ray Spectrometry. Sussex. Wiley, (2008). http://dx.doi.org/10.1002/9780470861981
Hadizadeh Yazdi, M. H., Mowlavi, A.A., Thompson, M. N. & Miri Hakimabad, H. Proper shielding for NaI(Tl) detectors in combined neutron-g fields using MCNP. Nuclear Instruments and Methods in Physics Research A, 522(3), 447454 (2004). http://dx.doi.org/10.1016/j.nima.2003.12.031
Kirby, R. K. & Kanare, H. M. National Bureau of Standards. Publication 260-110 (1998).
Konefal, A., Orlef, A., Laciak, M., Ciba, A. & Szewczuk, M. Thermal and resonance neutrons generated by various electron and X-ray therapeutic beams from medical linacs installed in polish oncological centers. Reports of Practical Oncology and Radiotherapy, 17(6), 339–346 (2012). http://dx.doi.org/10.1016/j.rpor.2012.06.004
McConn Jr., R. J., Gesh, C. J., Pagh, R. T., Rucker, R. A. & Williams III, R. G. Pacific Northwest National Laboratory, PNNL-15870 Rev. 1., (2011).
Mohammadi, N., Hakimabad, H. M. & Motavalli, L. R. Neural network unfolding spectrum measured by gold foil-based Bonner sphere. Journal of Radioanalytical and Nuclear Chemistry, 303(1), 1687 – 1693 (2015).
Pohorecki, W., Jodlowski, P., Pytel, K. & Prokopowicz, R. Measurement and calculation of long-lived radionuclide activity forming in the fast neutron field in some ITER construction steels. Fusion Engineering Design, 89(7-8), 932–936 (2014). http://dx.doi.org/10.1016/j.fusengdes.2014.04.074
Polaczek-Grelik, K., Karaczyn, K. & Konefal, A. Nuclear reactions in linear medical accelerators and their exposure consequences. Applied Radiation and Isotopes, 70(10), 2332-2339 (2012). http://dx.doi.org/10.1016/j.apradiso.2012.06.021
Polaczek-Grelik, K., Orlef, A., Dybek, M., Konefal, A. & Zipper, W. Linear accelerator therapeutic dose-induced radioactivity dependence. Applied Radiation and Isotopes 68(4-5), 763-766 (2010). http://dx.doi.org/10.1016/j.apradiso.2009.09.051
Salgado, C. M., Brandao, L. E. B., Schirru, R., Pereira, C. M. N.A. & Conti, C. C. Validation of a NaI(Tl) detector´s model developed with MCNP-X code. Progress in Nuclear Energy 59, 19–25 (2012). http://dx.doi.org/10.1016/j.pnucene.2012.03.006
Sharma, A., Singh, K., Singh, B. & Sandhu, B. S. Experimental response function of NaI(Tl) scintillation detector for gamma photons and tomographic measurements for defect detection. Nuclear Instruments and Methods in Physics Research B, 269(3), 247-256 (2011). http://dx.doi.org/10.1016/j.nimb.2010.09.004
Vega-Carrillo, H. R. & Rivera-Perez, E. Moderator for neutron activation with the photoneutrons produced by a LINAC. Journal of Radioanalytical and Nuclear Chemistry, 299(3), 1499-1507 (2014). http://dx.doi.org/10.1007/s10967-013-2868-1
Vega-Carrillo, H. R. Erratum to “Geometrical efficiency for a parallel disk source and detector” [Nucl. Instr. And Meth. A 371 (1996) 535-537]. Nuclear Instruments and Methods in Physics Research A, 538(1-3), 814 (2005). http://dx.doi.org/10.1016/j.nima.2004.11.014
Vega-Carrillo, H. R. Geometrical efficiency for a parallel disk source and detector. Nuclear Instruments and Methods in Physics Research A, 371(3), 535– 537 (1996). http://dx.doi.org/10.1016/0168-9002(95)00998-1
X-5 Monte Carlo Team, Los Alamos National Laboratory Report LA-CP-03-0245, (2003).
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