Specification of Irradiation Conditions in the DONA 5 Rotational Channel of the LVR-15 Reactor
This article summarizes ways to verify neutron
fluence for neutron transmutation doping of silicon with phosphorus
on the LVR-15 reactor. Neutron fluence is determined using
activation detectors placed along the crystal in a strip or encapsulated
in a rod holder. Holders are placed at the centre of a water-filled
capsule or in an aluminum or silicon ingot that simulates a real single
crystal. If the diameter of the crystal is significantly less than the
capsule diameter and water from the primary circuit enters the free
space in the capsule, neutron interaction in the water changes neutron
fluence, affecting axial irradiation homogeneity. The effect of
moving the capsule vertically in the channel relative to maximum
neutron fluence in the reactor core was also measured. Even a small
shift of the capsule-s centre causes great irradiation inhomogeneity.
This effect was measured using activation detectors, and was also
confirmed by MCNP calculation.
[1] M. M. Othman, S. A. Agamy, M.S. Nagy, "Neutron transmutation
doping conceptual design", Nuclear Research Center, Alexandria, Egypt,
2010.
[2] Von Ammon W., Neutron transmutation doped silicon, Technological
and economic aspects, Nuclear Instruments and Methods B 63, 1992.
[3] Kulikov D. V., et al., Computer simulation of neutron transmutation
doping of isotopically engineered heterostructure, Nuclear Instruments
and Methods B 228, 2005.
[4] Neutron transmutation doping of silicon at research reactors,
International Atomic Energy Agency -TECDOC series, ISSN 1011-
4289, no. 1681, Vienna 2012.
[5] L. Viererbl, V. Klupák, M. Vinš, Z. Lahodová, A. Kolmistr, J. Stehno,
"Radiation measurements after irradiation of silicon for neutron
transmutation doping", Conference ISRP, Rio de Janeiro, 2012.
[6] ASTM E181-98: Standard Test Methods for Detector Calibration and
Analysis of Radionuclides, 2003.
[7] D. B. Pelowitz, MCNPX USER-S MANUAL Version 2.7.0 - LA-CP-11-
00438, Los Alamos National Laboratory, 2011.
[1] M. M. Othman, S. A. Agamy, M.S. Nagy, "Neutron transmutation
doping conceptual design", Nuclear Research Center, Alexandria, Egypt,
2010.
[2] Von Ammon W., Neutron transmutation doped silicon, Technological
and economic aspects, Nuclear Instruments and Methods B 63, 1992.
[3] Kulikov D. V., et al., Computer simulation of neutron transmutation
doping of isotopically engineered heterostructure, Nuclear Instruments
and Methods B 228, 2005.
[4] Neutron transmutation doping of silicon at research reactors,
International Atomic Energy Agency -TECDOC series, ISSN 1011-
4289, no. 1681, Vienna 2012.
[5] L. Viererbl, V. Klupák, M. Vinš, Z. Lahodová, A. Kolmistr, J. Stehno,
"Radiation measurements after irradiation of silicon for neutron
transmutation doping", Conference ISRP, Rio de Janeiro, 2012.
[6] ASTM E181-98: Standard Test Methods for Detector Calibration and
Analysis of Radionuclides, 2003.
[7] D. B. Pelowitz, MCNPX USER-S MANUAL Version 2.7.0 - LA-CP-11-
00438, Los Alamos National Laboratory, 2011.
@article{"International Journal of Chemical, Materials and Biomolecular Sciences:63884", author = "Zdena Lahodová and Michal Koleška and Ladislav Viererbl", title = "Specification of Irradiation Conditions in the DONA 5 Rotational Channel of the LVR-15 Reactor", abstract = "This article summarizes ways to verify neutron
fluence for neutron transmutation doping of silicon with phosphorus
on the LVR-15 reactor. Neutron fluence is determined using
activation detectors placed along the crystal in a strip or encapsulated
in a rod holder. Holders are placed at the centre of a water-filled
capsule or in an aluminum or silicon ingot that simulates a real single
crystal. If the diameter of the crystal is significantly less than the
capsule diameter and water from the primary circuit enters the free
space in the capsule, neutron interaction in the water changes neutron
fluence, affecting axial irradiation homogeneity. The effect of
moving the capsule vertically in the channel relative to maximum
neutron fluence in the reactor core was also measured. Even a small
shift of the capsule-s centre causes great irradiation inhomogeneity.
This effect was measured using activation detectors, and was also
confirmed by MCNP calculation.", keywords = "Irradiation homogeneity, neutron fluence, neutron transmutation doping, rotational channel.", volume = "7", number = "6", pages = "472-4", }