Neutron-Flux Spectral Determination by Foil Activation

McElroy, W.N.; Berg, S.; Gigas, G.

doi:10.13182/nse86-a17618

Cited by 75 publications

(29 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The eigenvalue calculations were executed to obtain the subcriticality in the subcritical state and the excess reactivity in the critical state, while the fixed-source calculations were conducted to obtain the values of the reaction rates yielded by the In wire and the activation foils assuming continuous injection of 14 MeV neutrons into the subcritical assembly. The analyses of the neutron spectrum were carried out using an unfolding code SAND-II 25) together with MCNP-4C3 and JENDL Activation Cross Section File 96 for the initial guess results of threshold reaction rates. Note that the MCNP statistical error was one standard deviation of 0.03%Ák=k in multiplication factor k eff and the number of neutron histories was 2 Â 10 7 .…”

Section: Resultsmentioning

confidence: 99%

Preliminary Experiments on Accelerator-Driven Subcritical Reactor with Pulsed Neutron Generator in Kyoto University Critical Assembly

Pyeon

Hirano

Misawa

et al. 2007

J. Nucl. Sci. Technol.

View full text Add to dashboard Cite

A series of preliminary experiments on an accelerator-driven subcritical reactor (ADSR) with 14 MeV neutrons were conducted at Kyoto University Critical Assembly (KUCA) with the prospect of establishing a new neutron source for research. A critical assembly of a solid-moderated and-reflected core was combined with a Cockcroft-Walton-type accelerator. A neutron shield and a beam duct were installed in the reflector region for directing as large a number as possible of the high-energy 14 MeV neutrons generated by deuteron-tritium (D-T) reactions to the fuel region, since the tritium target is located outside the core. And then, neutrons (14 MeV) were injected into a subcritical system through a polyethylene reflector. The objectives of this paper are to investigate the neutron design accuracy of the ADSR with 14 MeV neutrons and to examine experimentally the neutronic properties of the ADSR with 14 MeV neutrons at KUCA. The reaction rate distribution and the neutron spectrum were measured by the foil activation method for investigating the neutronic properties of the ADSR with 14 MeV neutrons. The eigenvalue and fixed-source calculations were executed using a continuous-energy Monte Carlo calculation code MCNP-4C3 with ENDF/B-VI.2 for the subcriticality and the reaction rate distribution, respectively; the unfolding calculation was done using the SAND-II code coupled with JENDL Activation Cross Section File 96 for the neutron spectrum. The values of the calculated subcriticality and the reaction rate distribution were in good agreement with those of the experiments. The results of the experiments and the calculations demonstrated that the installation of the neutron shield and the beam duct was experimentally valid and that the MCNP-4C3 calculations were accurately carried out for analyzing the neutronic properties of the ADSR with 14 MeV neutrons at KUCA.

show abstract

Section: Resultsmentioning

confidence: 99%

Preliminary Experiments on Accelerator-Driven Subcritical Reactor with Pulsed Neutron Generator in Kyoto University Critical Assembly

Pyeon

Hirano

Misawa

et al. 2007

J. Nucl. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…R i; j are calculated by using the SAND II code, 4) with initial guesses of R i; j calculated from the mass energy-absorption coefficients of Si. A detailed method for obtaining the response function is described in Ref.…”

Section: Unfolding Methodsmentioning

confidence: 99%

Using X-ray Energy Information in CT Measurement of a Phantom with an Al Region

Minami

Imamura

Kanno

et al. 2011

J. Nucl. Sci. Technol.

View full text Add to dashboard Cite

X-ray computed tomography (CT) using X-ray energy information has been studied by the present authors on acrylic phantoms containing an iodine contrast medium. To observe a human body, however, it is necessary to consider the bone. In this paper, CT measurements were made on a phantom with regions of both iodine and aluminum, which was used as a substitute for the bone. A filtered back-projection method and a maximum likelihood-expectation maximization method were employed for image reconstruction.

show abstract

“…The response function R i,j is obtained by unfolding the following matrix equation by SANDII code [4].…”

Section: Response Functionsmentioning

confidence: 99%

Energy-resolved computed tomography measurements of iron solution and adipose as a simulation for estimating the iron concentration in the human liver

Yamashita

Shimazaki

Shima

et al. 2013

Journal of Nuclear Science and Technology

View full text Add to dashboard Cite

To measure the iron concentration in the human liver, which comprises soft tissue and adipose as well as iron, energy-resolved computed tomography (CT) is applied using a transXend detector. The transXend detector measures X-rays as electric current and gives an energy distribution after analysis. Energy-resolved CT clearly separates iron solution from acrylic, a substitute for soft tissue, whereas conventional currentmeasurement CT cannot. Using CT values obtained in two different energy ranges, a two-dimensional map of iron, adipose and soft tissue is plotted. With this map, the components in the liver can be identified.

show abstract

Neutron-Flux Spectral Determination by Foil Activation

Cited by 75 publications

References 0 publications

Preliminary Experiments on Accelerator-Driven Subcritical Reactor with Pulsed Neutron Generator in Kyoto University Critical Assembly

Preliminary Experiments on Accelerator-Driven Subcritical Reactor with Pulsed Neutron Generator in Kyoto University Critical Assembly

Using X-ray Energy Information in CT Measurement of a Phantom with an Al Region

Energy-resolved computed tomography measurements of iron solution and adipose as a simulation for estimating the iron concentration in the human liver

Contact Info

Product

Resources

About