A technique for measuring gamma heating in a low fluence mixed radiation field

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Gamma heating measurements have been made in a low-Z lattice irradiated with 14-MeV neutrons and (n,n{prime}) gammas produced by a Texas Nuclear Model 9400 neutron generator. Heating measurements were made in the mid-line of the assembly using a proportional counter operating in the Continuously-varied Bias-voltage Acquisition mode. The neutron-induced signal was separated from the gamma-induced signal by exploiting the signal rise-time rate differences inherent to radiations of different Linear Energy Transfer, which are observable in a proportional counter. The operating limits of this signal separation technique were explored by observing the effect on the signal as the neutron spectrum is ... continued below

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Chiu, H.K. (Illinois Univ., Urbana, IL (USA). Dept. of Nuclear Engineering Argonne National Lab., IL (USA)); Bennett, E.F. & Micklich, B.J. (Argonne National Lab., IL (USA)) January 1, 1991.

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Gamma heating measurements have been made in a low-Z lattice irradiated with 14-MeV neutrons and (n,n{prime}) gammas produced by a Texas Nuclear Model 9400 neutron generator. Heating measurements were made in the mid-line of the assembly using a proportional counter operating in the Continuously-varied Bias-voltage Acquisition mode. The neutron-induced signal was separated from the gamma-induced signal by exploiting the signal rise-time rate differences inherent to radiations of different Linear Energy Transfer, which are observable in a proportional counter. The operating limits of this signal separation technique were explored by observing the effect on the signal as the neutron spectrum is shifted from a D-T spectrum to a softer though still fast neutron spectrum as the counter is placed further into the irradiation lattice. The experiment was modelled using the one-dimensional radiation transport code ANISN/PC. The cross-section set used for these calculations was derived from the ENDF/B-V library using the code MC{sup 2}-2 for the case of D-T neutrons slowing down in a low-Z lattice. The calculated neutron and gamma spectra in the slab and the relevant mass-stopping powers were used to construct weighting factors which relate the energy deposition in the counter fill-gas to that in the counter wall and in the surrounding material. The total energy deposition at various positions in the lattice is estimated by applying these weighting factors to the measured gamma energy deposition in the counter at those locations. The overall utility of this measurement technique for fusion blanket neutronics is discussed. 8 refs., 5 figs., 2 tabs.

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Pages: (20 p)

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OSTI; NTIS; INIS; GPO Dep.

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  • 2. international symposium on nuclear fusion technology, Karlsruhe (Germany, F.R.), 3-8 Jun 1991

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  • Other: DE91015208
  • Report No.: ANL/CP-71822
  • Report No.: CONF-910615--4
  • Grant Number: W-31109-ENG-38
  • DOI: 10.2172/6133333 | External Link
  • Office of Scientific & Technical Information Report Number: 5604450
  • Archival Resource Key: ark:/67531/metadc1092594

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  • January 1, 1991

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  • Feb. 10, 2018, 10:06 p.m.

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  • April 19, 2018, 4:07 p.m.

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Chiu, H.K. (Illinois Univ., Urbana, IL (USA). Dept. of Nuclear Engineering Argonne National Lab., IL (USA)); Bennett, E.F. & Micklich, B.J. (Argonne National Lab., IL (USA)). A technique for measuring gamma heating in a low fluence mixed radiation field, article, January 1, 1991; Illinois. (digital.library.unt.edu/ark:/67531/metadc1092594/: accessed December 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.