Authors:
T. Williamson University of Virginia Department of Nuclear Engineering and Engineering Physics 22901 Charlottesville VA (USA)

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P. Benneche University of Virginia Department of Nuclear Engineering and Engineering Physics 22901 Charlottesville VA (USA)

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B. Hosticka University of Virginia Department of Nuclear Engineering and Engineering Physics 22901 Charlottesville VA (USA)

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J. Brenizer University of Virginia Department of Nuclear Engineering and Engineering Physics 22901 Charlottesville VA (USA)

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T. Nguyen University of Virginia Department of Nuclear Engineering and Engineering Physics 22901 Charlottesville VA (USA)

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Abstract  

An epithermal energy neutron irradiation facility has been used to perform instrumental activation analysis for iodine, silicon, nickel, zirconium, uranium and thorium. The facility, which is adjacent to the fuel of the University of Virginia 2.0 MW pool reactor, consists of a dry sample region surrounded by a fixed cadmium shield. A boron nitride capsule can be used to hold the sample in the cadmium facility to further enhance the reduction of thermal neutron activation. The neutron fluence rate is 2.2×1016 n·m–2·s–1 for fission spectrum energy neutrons (measured with Ni(n,p)Co) and 8.2·1015 n·m–2·s–1 for resonance energy neutrons (measured with gold).Iodine has been measured at concentrations as low as 0.1 mg/kg with 3% counting statistics in powdered infant formula and 0.15 mg/kg with 5% statistics in liquid infant formula. Silicon has been measured at concentrations of 0.2% in biological samples with counting statistics between 5 and 10% and in coal and soil at concentrations greater than 4% with better than 1% statistics. Nickel has been measured in coal and soil at the 20 mg/kg level and higher with 6% statistics. Zirconium has been determined at 600 mg/kg and greater in ceramics with counting errors less than 3%. Uranium and thorium have been measured at the 10 mg/kg level with 3% counting statistics.

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Journal of Radionalytical and Nuclear Chemistry
Language English
Size A4
Year of
Foundation
1968
Volumes
per Year
1
Issues
per Year
12
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 0236-5731 (Print)
ISSN 1588-2780 (Online)