Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
권호 표지

RADIAL UNIFORMITY OF NEUTRON IRRADIATION IN SILICON INGOTS FOR NEUTRON TRANSMUTATION DOPING AT HANARO

  • Published : 2006.02.01
Download PDF
⟨ Previous Next ⟩

Abstract

The radial uniformity of neutron irradiation in silicon ingots for neutron transmutation doping (NTD) at HANARO is examined by both calculations and measurements. HANARO has two NTD holes named NTD1 and NTD2. We have been using the NTD2 hole for 5 in. NTD commercial service, and we intend to use two holes for 6 in. NTD. The objective of this study is to predict the radial uniformity of 6 in. NTD at the two holes. The radial neutron flux distributions inside single crystal and noncrystal silicon loaded at the NTD2 hole are calculated by the VENTURE code. For NTD1, the radial distributions of the reaction rate for a 6 in. NTD with a neutron screen are calculated by MCNP, and measured by gold wire activation. The results of the measurements are compared with those of the calculations. From the VENTURE calculation, it is confirmed that the neutron flux distribution in the single crystal silicon is much flatter than that in the non-crystal silicon. The non-uniformities of the measurements for radial neutron irradiation are slightly larger than those of the calculations. However, excluding local dips in the measurements, the overall trends of the distributions are similar. The radial resistivity gradient (RRG) for a 5 in. silicon ingot is estimated to be about $1.5\%$. For a 6 in. ingot, the RRG of a silicon ingot irradiated at HANARO is predicted to be about $2.1\%$. Also, from the experimental results, we expect that the RRG would not be larger than $4.4\%$.

Keywords

References

  1. B. J. Baliga, Modern Power Devices, p.32, John Wiley & Sons, New York (1987)
  2. P. E. Schmidt and J. Vedde, 'High Resistivity NTD-Production and Applications,' Electrochemical Society Proceedings, Vol.98-13, 3 (1998)
  3. A. W. Carbonari, W. Pendl Jr., J. R. Sebastiao, R. N. Saxena and M. S. Dias, 'An irradiation rig for neutron transmutation doping of silicon in the IEA-R1 research reactor,' Nucl. Instr. and Meth., B83, 157 (1993) https://doi.org/10.1016/0168-583X(93)95920-Z
  4. D. Alexiev, K. S. A. Butcher and T. L. Tansley, 'Neutron transmutation doping of silicon for the production of radiation detectors,' Nucl. Instr. and Meth., B69, 510 (1992) https://doi.org/10.1016/0168-583X(92)95308-E
  5. S. Sheibani, F. Moattar, M. Ghannadi Maragheh and H. Khalafi, 'Investigation of a simple and efficient method for silicon neutron transmutation doping process in Tehran research reactor,' Ann. Nucl. Energy, 29 1195 (2002) https://doi.org/10.1016/S0306-4549(01)00100-1
  6. B. J. Jun, C. S. Lee, B. C. Lee and H. R. Kim, 'Analysis of NTD Method in HANARO,' Proc. of 2000 KNS Autumn Meeting, Daejeon, Korea, 2000
  7. M. Sultan, E. Elsherbiny and M. Sobhy, 'A Method for Neutron Transmutation Doping of Silicon in Research Reactors,' Ann. Nucl. Energy, 22-5, 303 (1995) https://doi.org/10.1016/0306-4549(94)00063-K
  8. B. J. Jun, Y. D. Song, M. S. Kim and B. C. Lee, 'Neutronic Design of Irradiation Device for Neutron Transmutation Doping in HANARO,' Proc. of PHYSOR 2002, Seoul, Korea, 2002
  9. Y. S. Cho, C. S. Gil and J. Chang, 'The Calculation of Neutron Scattering Cross Sections for Silicon Crystal at the Thermal Energies,' Journal of the Korean Nuclear Society, 31-6, 631 (1999)
  10. H. R. Kim, C. S. Lee, and J. B. Lee, 'In-Core Fuel Management Practice in HANARO,' Nucl. Eng. and Des., 179, 281 (1998) https://doi.org/10.1016/S0029-5493(97)00280-X
  11. A. K. Freund, 'Cross-sections of Materials Used as Neutron Monochromators and Filters,' Nucl. Instr. and Meth., 213, 495 (1983) https://doi.org/10.1016/0167-5087(83)90447-7
  12. M. S. Kim, S. H. Byun, S. J. Park, B. S. Sung and B. J. Jun, 'Measurements of Neutron Cross-Sections of Si and Bi Crystals for BNCT Filter,' Proc. of 2000 KNS Autumn Meeting, Daejeon, Korea, 2000
  13. W. von Ammon, 'Neutron transmutation doped silicon technological and economic aspects,' Nucl. Instr. and Meth., B63, 95 (1992) https://doi.org/10.1016/0168-583X(92)95176-R