An international journal published by K. N. Toosi University of Technology

Document Type : Research Article

Authors

1 Radiation Applications Research School‎, ‎Nuclear Science and Technology Research Institute‎, ‎AEOI‎, ‎PO Box 11365-3486‎, ‎Tehran‎, ‎Iran

2 Physics and Accelerators Research School‎, ‎Nuclear Science and Technology Research Institute‎, ‎AEOI‎, ‎PO Box 11365-3486‎, ‎Tehran‎, ‎Iran‎

Abstract

‎In this paper‎, ‎dose uniformity ratio in irradiation cell of GC-220 is specifiedutilizing an analytical method based on the multipole moment expansion‎. ‎In this method‎, ‎the values of monople‎, ‎dipole and quadrupole moments for source arrangements of GC-220 are calculated by numerical integrating‎. ‎Appling these values‎, ‎the dose uniformity ratio in the irradiation cell of GC-220 is calculated equal to 1.92‎. ‎Monte Carlo simulation is applied to validate calculations‎. ‎There is a relative difference about 12% between the results obtained from the analytical calculation and Monte Carlo simulation‎, ‎which confirm the used method‎. ‎In comparison with Monte Carlo methods‎, ‎this method is not time consuming‎, ‎so‎, ‎this method can be used for the conceptual designing and the source load planning of irradiators‎.

Highlights

  • The dose uniformity ratio DUR is calculated using the analytical method.
  • The analytical method was based on multipole moment expansion.
  • The DUR in radiation cell of GC-220 was calculated using Monte Carlo simulations.
  • The di erence between values of DUR calculated by the analytical and simulation is less than 12%.
  • The consistency between calculations and Monte Carlo simulations validates the presented method.

Keywords

Akhavan, A., Sheikh, N., Khoylou, F., et al. (2014). Synthesis of antimicrobial silver/hydroxyapatite nanocomposite by gamma irradiation. Radiation Physics and Chemistry, 98:46–50.

Briesmeister, J. F. et al. (2000). MCNP4 A Monte Carlo N Particle Transport Code System. Contributed by Los Alamos National Laboratory, Los Alamos, New Mexico.

Chu, R. D. H. (1990). Dosimetry studies to determine optimum processing parameters to minimize dose variations in non-uniform product. International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry, 35(4-6):841–844.

Cummins, D. O. and Delaney, C. F. G. (1961). Design studies for a Cs-137 irradiator. The International Journal of Applied Radiation and Isotopes, 10(2-3):106–111.

Farah, K., Jerbi, T., Kuntz, F., et al. (2006). Dose measurements for characterization of a semi-industrial cobalt-60 gamma-irradiation facility. Radiation Measurements, 41(2):201–208.

Gual, M. R., Batista, A. d. S. M., Pereira, C., et al. (2013). Dose rate distribution of the Gamma Beam-127 irradiator using MCNPX code. International Nuclear Atlantic Conference; Recife, PE (Brazil).

Kadri, O., Gharbi, F., and Farah, K. (2005). Monte Carlo improvement of dose uniformity in gamma irradiation processing using the GEANT4 code. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 239(4):391–398.

Oliveira, C. and Salgado, J. (2001). Isodose distributions and dose uniformity in the portuguese gamma irradiation facility calculated using the MCNP code. Radiation Physics and Chemistry, 61(3):791–793.

Raisali, G. R., Sohrabpour, M., and Hadjinia, A. (1990). A computer code for dose rate mapping of gamma irradiators.

International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry, 35(4-6):831–835.

Rezaeian, P., Ataenia, V., and Shafiei, S. (2017). An analytical method based on multipole moment expansion to calculate the flux distribution in Gammacell-220. Radiation Physics and Chemistry, 141:339–345.

Sharpe, P. H. G., Sephton, J. P., and Chu, R. D. (2000). Real time dosimetry measurements at an industrial irradiation plant. Radiation Physics and Chemistry, 57(3):687–690.

Solanki, R. B., Prasad, M., Sonawane, A. U., et al. (2012). Probabilistic safety assessment for food irradiation facility. Annals of Nuclear Energy, 43:123–130.

Soliman, Y. S., Beshir, W. B., Abdel-Fattah, A. A., et al. (2013). Dosimetric studies for gamma radiation validation of medical devices. Applied Radiation and Isotopes, 71(1):21–28.

Vandana, S., Shaiju, V. S., Sharma, S. D., et al. (2011). Dosimetry of gamma chamber blood irradiator using Gafchromic EBT film. Applied Radiation and Isotopes, 69(1):130–135.